Rendering in Unity

As you probably know, Where Shadows Slumber is starting to ramp up toward a release this summer. It’s an exciting, terrifying time. We can’t wait to share the entirety of what we’ve been working on with the world, but there’s also a daunting amount of stuff to do, and not much time to do it.

If you’ve played any of the recent beta builds, hopefully you like what you’re seeing in terms of design, functionality, polish, art, and sound. Unfortunately, if you’ve played the beta on anything other than a high-end device, you’ve probably noticed something that you don’t like: lag.

Lag is annoying. Lag is something that can take a great game and ruin it. It doesn’t matter that your level design is perfect, your models are beautiful, and your music is entrancing if it only runs at 10 frames per second. If that’s the case, nobody is going to enjoy playing it. And, regrettably, that happens to be the case for Where Shadows Slumber.

LikeButta

Like butta’!

So, one of my biggest tasks before we release is to optimize the game, making it run faster and allowing us to have higher frame rates. The area with the most opportunity for improvement is during rendering. A game consists of a lot of logic – Obe’s location, things changing in shadow, etc. – but rendering is the process of actually drawing the scene onto the pixels of your screen.

Earlier this week, I started a post about the different tools you can use to help optimize your rendering performance. It seemed like a good idea, since that’s exactly what I was doing. However, I realized that if you don’t know how rendering works in the first place, most of it is complete gibberish. So I’m gonna leave that post for next week, and this week I’ll give a quick introduction to how 3D rendering works in Unity.

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Rendering

Rendering is the process by which the objects in your game are drawn to the screen. Until it’s rendered, an object in your game is just a collection of information about that object. That information gets translated from information the game engine understands into information the GPU can understand. There are a few important concepts to understand here:

  • An object’s mesh describes the shape of the object. It consists of a collection of vertices and triangles.
  • An object’s material is a description of how that object should be drawn. It encapsulates things like colors and shininess.
  • Every material uses a shader. This is the program which calculates exactly what color each pixel should be, based on the information in the mesh and material.
  • World space is the 3D coordinate space in which all of your game objects live.
  • Screen space is a 2D coordinate space that represents the screen to which the game is drawn.

The basics of rendering are pretty easy to understand, at least from a high-level view. The meshes for the objects in your game are translated from world space to screen space, based on the camera that’s doing the rendering. For instance, in Where Shadows Slumber, objects that are further away in the x-axis will be higher up and more to the right when viewed on the screen. Fortunately, we don’t have to mess with this too much – Unity’s cameras do a good job of making this translation.

Once we know where each pixel should be drawn, we need to determine what color that pixel should be – this is where the material and shader come in. Unity provides a whole bunch of information to the shader (position, angle, information about lights in the scene, etc.). The shader uses that information, plus the information from the material, to determine exactly what color the given pixel should be. This happens for every pixel on the screen, resulting in a beautiful picture of exactly what you expect to see.

The GPU

Now that we understand the basics of rendering, let’s take a deeper look into how it actually happens: the GPU.

The GPU, or graphics processing unit, is the part of the computer in charge of calculating the results of our shaders to determine a pixel’s color. Since modern phones have over 2 million pixels, our shader code must be run over 2 million times per frame – all within a fraction of a second.

How does the GPU manage to do so many calculations so quickly? It’s due to the design of the GPU, and can be summed up in one very important sentence: the GPU is good at performing the same operation, a bunch of times, very quickly. The key thing to remember here is that it’s good at performing the same operation; trying to perform different operations is what slows it down.

Specifically, switching from one material to another causes a bit of a hiccup in terms of speed. The properties of the material are passed to the GPU as a set of parameters in what is known as a SetPass call. SetPass calls are one of the first and most important indicators when it comes to optimizing rendering performance, and are often indicative of how quickly or slowly your game will run.

Because SetPass calls take so long, Unity has a strategy for avoiding them called batching. If there are two objects that have the same material, that means they have the same parameters passed to the GPU. This means that those parameters don’t need to be reset in between drawing the two objects. These two objects can be batched, so the GPU will draw them at the same time. Batching is Unity’s first line of defense against rendering slowness.

The CPU

While the GPU is the star of the show when it comes to rendering, the CPU, or central processing unity, still does some important stuff that’s worth mentioning (even if it doesn’t have a huge bearing on the optimization steps we’ll be taking). Of course, the CPU is in charge of running your game, which includes all of the non-shader code you’ve written for it, as well as any under-the-hood things Unity is doing, like physics and stuff.

The CPU does a lot of the “set up” for rendering, before the GPU comes in and does the heavy number-crunching. This includes sending specific information to the GPU, including things like the positions of lights, the properties of shadows, and other details about the scene and your project’s rendering config.

One of the more important rendering-related things the CPU does is called culling. Since the CPU knows where your camera is, and where all of your objects are, it can figure out that some objects won’t ever be viewed. The GPU won’t know this, and will still perform calculations for those objects. In order to avoid doing these unnecessary calculations, the CPU will first remove any of the objects that won’t be drawn, so the GPU never even knows about them.

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All of these Hitlers would be culled by the CPU (image credit: smbc-comics.com)

Since we’re talking about performance, it should be noted that the GPU and the CPU are two different entities. This means that, if your game is experiencing lag, it’s likely due to either the GPU or the CPU, but not both. In this case, improving the performance of the other component won’t actually make your game run any faster, because you’ll still be bottlenecked by the slower process.

So, now that we know a little bit more about how rendering actually happens, maybe we can use that knowledge to improve performance! At least, that’s what I’m hoping. If Where Shadows Slumber never comes out, then you’ll know I’ve failed. Either way, I’ll see you next week for a look into the tools you can use to help you optimize rendering performance in Unity!

 

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If you didn’t already have a working knowledge of rendering, I hope this post helped! If you do know about rendering stuff, I hope you don’t hate me too much for my imprecision! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, join the Game Revenant Discord, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.

Just Do It

No, Where Shadows Slumber hasn’t received any funding from a mysterious shoe company. Rather, I want to discuss an aspect of working on a personal project that I’ve seen a lot of people struggle with, and that I’ve had trouble with in the past. Yes, this post touches on a few of the topics that I talked about in a previous blog post about ‘drive’, but today I want to focus more on a specific facet of the process: forcing yourself to work on something that you don’t want to.

Every project is difficult. In particular, every project begins to drag as you get closer and closer to the end. You find it more and more difficult to keep working on it. At the beginning of your project, there’s a whole bunch of stuff you’re excited to work on. As you reach the end, you find that you’ve done all of the fun things, and the only things left are boring tasks and difficult decisions. This is the point where you’re really being put to the test, and in this situation, I have one piece of advice for you – buckle down and just do it.

Let’s take a quick look at the different kinds of things you should just force yourself to do, and how to actually do so.

 

Doing Things You Don’t Want to Do

The most obvious kind of thing you don’t want to do is, well, something you just don’t want to do. These things are different for everyone, and come up for various reasons. For me, these are the cleanup/polish kinds of tasks. For other programmers, it might be the mathy, trig-related stuff. For an artist, maybe it’s animating hands or something (I hear that’s really hard…). Whatever it is, everyone has something they consider ‘dreg work’, and those tasks start to pile up.

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Tax  season is coming up, and I’m already putting it off

If you’re anything like me, when you come upon one of these tasks, you briefly consider doing it, and then you move on to something easier or more interesting. After all, there’s no shortage of work in your project! This happens a lot with teams as well, especially less organized teams – “if I go work on something else instead, somebody will probably take care of this by the time I get back to it”.

Unfortunately, these two base assumptions fall apart when it comes to indie game development (or any similar venture). In most cases, your project has to come to an end eventually, which means that you can’t simply keep putting these tasks off. And with a smaller, indie-sized team, it’s unlikely that you can just put that responsibility on someone else. It’s pretty cool to be the arbiter of your own success by taking charge of your own game development project, but it also involves other responsibilities.

I know quite a  few people who check their email regularly – until they see that one email that prompts them to do something. They know they have to do it, but they simply don’t want to. Rather than just doing it, getting it out of the way, and having some peace of mind, they close their email and proceed to ignore it for the better part of a week. Inevitably, this doesn’t cause the task to go away, but just gives them less time to do it, and a boatload of stress while they’re avoiding it anyway.

The bottom line is that these tasks must be done – you’ll come across them, and you’ll simply have to do them. The most important thing is to have a positive attitude in these instances. You come upon a task that you don’t want to do – acknowledge that you have to do it, take a deep breath, and just get started. Once you’ve begun, you’ll probably find that it’s not as bad as you thought – simply starting the task is usually the hardest part. And hey, if it ends up being an awful task, at least you got it out of the way!

 

Committing to an End

Another area where it’s very important to embrace a “just do it” attitude is when it comes to actually finishing your project. As an indie game developer, it’s perfectly natural to be apprehensive of your eventual release. After all, you’re just a small group of people (or even just one!), but your game will still have to compete with games made by giant studios. It makes sense to want to make sure your game is absolutely perfect before committing to a release.

The problem with this plan is the use of the word perfect. Your game will never be perfect. In fact, your game will never even be “good enough”, especially considering your own perfectionist perspective. Waiting for perfection leads you to a phase of endless polish, which can delay your project for years, or even indefinitely. The only thing worse than releasing an imperfect game is not releasing one at all.

There’s a pretty common attitude of “I’ll release it when it’s done”, or “I’ll know when I get closer to the end”. While these make sense at first blush, and are good mentalities to have toward the very beginning of a project, they quickly turn against you, causing your project to become more and more delayed.

duedate

Red marker. That’s how you know it’s serious.

Unfortunately, as introspective as we may consider ourselves, there’s a significant amount of stuff going on under the hood that we’re not even aware of. One of the more annoying of these is that, if there’s no “due date” for your project, your brain will subconsciously de-prioritize working on it. Similarly, there’s a well-known adage that work expands to fill the space its given – if you have twice the time to do something, you’ll just subconsciously work half as hard at it. For example, at the end of November, we were on schedule to release Where Shadows Slumber by April. We recently pushed that date back by a few months, without increasing the project’s scope. You would think that this would give us some breathing room, but the new “deadline” feels like it will somehow be even harder to meet!

Managing the timeline of an entire project is an incredibly difficult task. One important piece of advice I would give would be to pick a target release date. Even if it’s not public, picking a date, committing to it, and doing everything you can to meet it will definitely help you prioritize the work you’re doing, frame it appropriately, and avoid the project stretching into infinity.

Don’t get me wrong, you shouldn’t choose a release date willy-nilly; you should realistically estimate when you can complete the project, and choose accordingly. Similarly, there’s no need to have a specific end date in mind when you start the project. Your target date is a great motivational tool, but it only works if it’s at least somewhat accurate. Even if you miss your release date (or realize you’re going to, like we did), it’s not a problem. You just have to reassess the work that’s left, and choose a new date. As long as you don’t keep extending the project, you’ll be fine.

 

Decision-Making

While there are tasks that you don’t want to do because they’re difficult or time-consuming, there are other reasons to not want to do something. In particular, making decisions is a real sticking point for a lot of people. If you implement something incorrectly, you can always redo it, but many of the decisions you have to make for your game have an irreversible effect. This is really daunting, and since decisions themselves don’t take a lot of actual physical effort, the natural response is to simply put off making the decision for a bit.

DecisionMaking

When faced with a choice between success and failure, I hope you’ll always choose Where Shadows Slumber!

This is similar to the “end date” discussion above. While many of these decisions are very important and require a great deal of thought, they still have to be made. It’s important to never forget this fact, as decision paralysis is another great way to destroy your game.

When you find yourself facing one of these decisions, make sure you don’t back off, at least not repeatedly. You have to make the decision eventually, so you might as well do it now. In fact, in the case of some difficult, important decisions, you might even lock yourself in a room until you’ve made the decision. That’s exactly what we did when picking out the name for Where Shadows Slumber – Frank and I sat down, and neither of us was allowed to leave until we had picked a name. It ended up taking a few hours, but we had managed to nail down the answer to a very difficult decision.

 

Just Do It

There are a lot of places in game development where you find it hard to do what you have to do. These moments are gateways to stagnating development and endless work. When the time comes, you often must act. Don’t make half-hearted decisions or poor implementations, but really force yourself to do what needs to be done. Just do it.

 

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If you have any questions about any of our development struggles, or if you have any other questions about Where Shadows Slumber, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, join the Game Revenant Discord, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.

Unity 2018!

For those of you who haven’t been keeping up with current events in the indie game development space, there’s something really important that’s happened recently that you should probably know about.

It’s 2018!

Which leads me to another topic that we can spend some time discussing – Unity 2018!

 

Unity

Before we talk about Unity 2018, let’s discuss Unity itself. Unity is the game engine in which we’ve been developing Where Shadows Slumber for the past two and a half years, and even longer ago, when we were working on SkyRunner. Developing in a game engine makes things a lot easier for the little guys like us, because we don’t have to worry (as much) about things like platform-specific dependencies, rendering pipelines, mipmap implementations, etc. Without having to worry about that nitty-gritty stuff, we can spend our time focusing on the more grandiose parts of the development of WSS.

So the question is – how has working with Unity been?

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Unity!

Overall, Unity is awesome. It has somehow managed to find the right balance between an engine that you could use to make a AAA game, and one that you can use in a small, bureaucratically-challenged team. This alone is a great reason to use Unity – compared to using more complex engines like Unreal, it’s much easier to get up and running from scratch.

Of course, there are trade-offs, and this is a particularly big one. In order to avoid inundating newer users with game development intricacies and high-level concepts, Unity does a lot of that stuff for you, behind the scenes. While this is awesome in a lot of cases, there are some cases where it can be more of an issue. Imagine you’re an experienced game developer, with a sizable team, who wants to do something very specific in the backend. There’s a decent chance that Unity will have hidden that part of the engine from you, or at least made it difficult to interact with.

This tradeoff is, at its core, the reason that you would or wouldn’t want to use Unity. The next most important feature is the ease with which Unity allows you to develop on multiple platforms. All of your development is platform-agnostic, and you only choose the platform as you’re compiling. Is your Android game a success, and you want to build it for PC? Simply hit a different button, and Unity takes care of the rest. I don’t have too much experience with other engines, but this seems to be a place where other developers give Unity a lot of credit, and I think it’s deserved. I can’t imagine having to go through all of the development we’ve done multiple times for different platforms.

Beyond these bigger points, there are a few other things that might sway you, though they’re probably a little less important:

  • Unity is very UI-based, which means that it might be a little annoying for a hardcore programmer, like myself, whereas this probably makes it easier for someone with less coding experience, like Frank.
  • Unity is a sort of one-size-fits-all solution, whereas some other engines are ready-made to create certain types of games. For example, Unreal has good support for creating FPS games. If I were to make an FPS game, using Unreal would probably give me a bit of a head start on Unity.
  • The only language Unity supports is C#. C# is a pretty awesome language, but for those of you who hate C#, or strongly-typed languages in general, it may take some adjusting.

Again, I want to say that Unity has been great for us, and I would probably use it again if I were to start another game. Frank and I wouldn’t have gotten to where we are with Where Shadows Slumber if it weren’t for Unity.

 

Unity 2018

I mentioned earlier that Unity does a lot of stuff for us, and I specifically brought up rendering pipelines. The danger of using a game engine (that you didn’t make yourself) is that other people are making decisions for you, and those decisions are set in stone to a certain degree. On one hand, we didn’t want to mess with the collision system, so we were glad to have it. On the other hand, we ended up in a position where we did want to mess around with the rendering pipeline, and we weren’t able to.

Enter Unity 2018.

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The Unity UI, blatantly stolen from one of their blog posts.

I normally don’t pay too much attention to the ins and outs of the various updates that Unity makes. They’ve been marching out updates, both major and minor, for a while now, and we’ve just been going with the flow. Unity 2018, however, has managed to catch my eye. Unity recently released a blog post describing the updates they’ve been making to graphics and rendering in Unity 2018, and I have to admit that I’m pretty excited about it.

As I mentioned before, Unity does a good job of riding the line between too-complicated-for-new-users and not-powerful-enough-for-power-users, and the updates described for Unity 2018 somehow manage to play to both sides. If you’ve ever held a conversation with me about Unity and Where Shadows Slumber, then you know that I’ve been struggling with getting shadows to render the way I want, while also maximizing the efficiency of the rendering pipeline. Fortunately, Unity 2018’s focus on graphics and rendering has provided two huge features in this area, one for each of the two camps.

Scriptable Render Pipelines is the feature that I’m excited about, as it’s the feature aimed toward the entrenched coder. Rather than using the hard-coded rendering pipeline that we’ve been wrestling with for the past two years, we can create our own rendering pipeline that does exactly what we need it to.

“Programmers can now write custom renderers tailored specifically to their project.”

This is a huge boon to us, and to game developers everywhere. Rather than hacking together a shader that uses Unity’s shadow-mapping inefficiently, we can (hopefully) create a rendering pipeline that performs shadow-mapping exactly how and when we need it. This should result in more efficient rendering, along with less headache while writing shaders.

Shader Graph is the other great feature Unity 2018 will have, and is targeted toward less code-inclined users. Unity provides a standard shader with a bunch of options, so you can create the materials you want. However, if you need more customization than the standard shader provides (like we do), you’re suddenly thrust into the depths of shader-writing. With a masters degree in computer science, I’ve been just barely keeping up with writing our shaders, and there’s no way that Frank would have been able to do it. This is really a bummer, as the artist tends to know a bit more about the “look” they’re trying to get.

“[I]t’s simple enough that new users can become involved in shader creation.”

Unity 2018’s Shader Graph changes this – rather than writing complex shader code, Unity exposes a simple interface for creating shaders graphically. This would allow an artist with no coding experience whatsoever to build a custom shader to display things exactly as they want – giving the artist the control they need over the “look” of the game, and allowing the programmer to focus on the game itself.

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A sneak preview of Unity 2018’s Shader Graph UI

I’m sure that Unity 2018 comes with quite a few quality-of-life updates, as well as some other new and interesting features. For me, however, it’s all about those rendering updates!

 

Beyond Where Shadows Slumber

A friend of mine recently asked if I would use Unity for my theoretical next project, and if I would recommend it to someone just starting on a game. The answer I gave him is one that applies to every question – it depends. In fact, it mostly depends on the factors described in the first section.

Overall, I’m inclined to say that I would use Unity again. After over four years, I’ve come to know it pretty well. It’s powerful, and allows you to create and iterate pretty quickly. That said, there are some exceptions; I would probably pass on Unity for my next project, or at least do some more research, if:

  • I had very specific backend/optimization requirements
  • I were working with people who had a lot of experience with a different engine
  • The scale of the game were much bigger
  • The game involved a lot of networking/server concerns

There are probably other factors that come into play – basically, it pays to do some research before you dive in. I would recommend Unity, but more than that, I would recommend knowing what you’re getting yourself into. There’s nothing worse for your game than getting halfway through it in an engine that won’t work for you in the end.

If you’re anything like me, at this point the word “Unity” no longer sounds like a word. I’m gonna take that as a sign and wrap this post up; I hope I was able to answer any questions you might have had about working with Unity, and that I got you pumped for Unity 2018!

 

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If you have any questions about working with Unity, or if you have any other questions about Where Shadows Slumber, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, join the Game Revenant Discord, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.

Drive

If there’s one thing an indie game developer needs, it’s drive. The competition is fierce, the process is difficult, and we even have to deal with our day jobs on top of everything else.

In order to get our games to market successfully, we have to do a lot of stuff right, make a lot of difficult decisions, and put in a lot of hard work. In order to accomplish any of these things, the first thing you need is the urge to make a game, the drive to make your dream become a reality. But what exactly is drive?

Drive
drīv
noun
  1. an innate, biologically determined urge to attain a goal or satisfy a need.

Drive is the internal force you feel that causes you to create something. Drive is forcing yourself out of bed hours before you have to get to work, just for a chance to work on your game. Drive is spending the evening testing the performance of your pathfinding algorithm rather than playing Rocket League. Drive is a lot of things, but I think of it as three core parts:

  • The urge to work on a project, including the confidence that it will succeed – This is where drive starts. It’s impossible to follow any large project through to the end if you don’t care about it and believe in it.
  • The dedication to work on your project, despite any sacrifices you might have to make – This is how drive shows itself, and is the trait most associated with the term. When you want to complete something badly enough, you force yourself to work on it, even (and especially) when you don’t want to.
  • The willingness and ability to make difficult decisions about your project – This is less often associated with drive, but I think it’s perhaps the most important point. Choosing to trim features or making an irreversible development decision is very difficult, but it has to be done. Your project will suffer if you don’t make decisions, and you have to understand and embrace that.

I’ve seen a lot of indie game development projects suffer due to a lack of drive. The most obvious ones are the games that were never finished because development petered out. Slightly less obvious are the games that take over half a decade to develop because the developers aren’t willing to sacrifice parts of their games, or the games that do come out, but are a little lackluster because of prioritization and decision-making issues. I even know quite a few people who are much more qualified to make a game, but simply haven’t felt the drive to do so.

Frank and I, fortunately, do have a good bit of drive, and we’ve been very careful to get as much use out of it as possible. At the beginning of 2017, we had picked an internal target release date of March 15, 2018, and I’m pretty proud to say that, up until about two months ago, we were on target to meet that date.

Unfortunately, no amount of drive can get you through everything.

 


 

So What Happened?

A few months ago, my fiancée, Molly, went to see a doctor about a lump she had felt in her neck. Long story short, she was diagnosed with cancer this past November. I won’t go into all the details here (if you want to find out more, you can read her blog about the experience here), but suffice it to say that it’s really turned our lives upside down.

chemo

“In sickness and in health”

It’s pretty difficult for me to think of myself as “lucky” in any sense right now, but I know that things could have been much worse – we caught it early enough that it’s still curable. She is currently halfway through her four months of chemotherapy, which means she should be cured by the end of March.

While it’s not as bad as it could be, it’s definitely not good. Molly is the most important thing in my life, Where Shadows Slumber included, and I will continue to do everything I can for her. She has been endlessly supportive of the development of WSS, despite how much time I commit to it, and I intend to be just as supportive of her. Unfortunately, on account of my already-busy schedule, that means some things are going to suffer.

 

Development-Hell

Development shot of the first Level of the Jail.

What This Means for Where Shadows Slumber

If you read this blog regularly, you may have noticed that I haven’t been contributing as much as usual – Frank has stepped up and kept the blog posts flowing. However, what you most likely haven’t noticed is how little I’ve been able to contribute to the project itself. This trend will continue through the end of March – I’ll still be working on WSS as much as possible, but that amount will be far less than it has been over the past two years.

gitcontributions

Cancer and Commits are inversely proportional

What this means is that our targeted March 15 release date is no longer feasible, and we’re in a position where we have decided to push the release date back a few months. We still don’t have a public release date, but you should know that we will be releasing in Quarter 2 of this year rather than Quarter 1.

While this is the biggest concrete reason to push back the release date, to be honest, everyone on the team is breathing a sigh of relief. We are all very determined to finish this project in a timely fashion, and we all have the necessary drive to do so, but we also know that the extra time will help us to make Where Shadows Slumber the best that it can be. I know Frank wanted more time to work on polishing up the art, Noah and Alba mentioned that they could implement some cool sound stuff if we had more time, and I could definitely afford to put more work into optimization.

 

Development-Snow

Development shot of one of the Levels in the Summit.

 

Moving Forward

Despite all of this, I still have the drive to finish Where Shadows Slumber. Aside from the shift in timeline, our plans for the game haven’t changed, and our goals seem as achievable as ever. Hopefully, come April, this will all be behind us, and the glorious future of Where Shadows Slumber will be the next thing on the horizon.

 

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If you have any questions about our timeline and how it has changed, or if you have any other questions about Where Shadows Slumber, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, join the Game Revenant Discord, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.

Problem Solving: Design and Complexity

Game design and development is a complicated process. Creating an intricate tapestry of player interaction, incentive, and reward can be quite difficult, and you will no doubt run into trouble along the way. This is a simple fact of game development – in fact, this phenomenon represents most of the time you’ll spend working on your game. Therefore, you shouldn’t worry about it when that trouble finds you! However, an important part of how polished your game ends up, how long it takes to make, and whether or not you even get a chance to finish it is how you handle the issues you run into.

At its core, a game can be described by a set of rules which govern gameplay, and a starting game state. A match-three game, for example, can be described by the following rules:

Simple match-three rules

  1. The game starts with a grid of colors.
  2. Any three or more adjacent cells of the same color disappear, granting points to the player.
  3. If there is an empty cell, the cells above it slide down to fill in the space, generating a new cell at the top.
  4. The player may switch the colors in two adjacent cells.
  5. The game may end when the player reaches a certain number of points, or when they make a certain number of moves, or if there are no available moves, etc.

Obviously, these rules don’t encompass everything that happens in a game, and the rules get much more complicated very quickly for more complex games. These simple base rules define your gameplay, but they very quickly become more intricate as you add features and functionality. Let’s look at a few updates to our match-three example:

  • If we want to add a type of cell which can’t be moved, we would have to change rule #4 to “The player may switch the colors in two adjacent cells unless either of those cells is unmovable”.
  • If we want to add an “exploding” cell which eliminates nearby cells, we would have to change rule #2 to “Any three or more adjacent cells of the same color disappear, granting points to the player, and if one of them is an exploding cell, adjacent cells also disappear”.

The base rules handle 90% of the gameplay situations, but we have to add special provisions for exceptions of those rules. In game development (and computer science in general), these exceptions are called edge cases, and, as necessary as they are, they’re super annoying. Your code will include edge cases, and it should, but you have to be careful with them (edge cases may be considered a type of hack, which I discuss in one of my previous blog posts), and you should avoid them when possible. One of the primary ways to do that, depending on your game, is through design – rather than complicating your codebase, you can try to design your game and/or levels in such a way that you don’t need to change your code.

 

An Example from Where Shadows Slumber

Let’s take a look at the inspiration behind this post – a case I ran into in Where Shadows Slumber where I faced such a decision.

1-1 goal

Ominous!

At the end of each level, there’s a ‘goal’ space. When Obe steps on it, it triggers the end-of-level sequence to begin – the lights fade, Obe walks out of the scene, and then the next level loads. The question is, given the game rules, how can I make this happen? I could have added a specific code path for this case, but I realized that I could use some already-existing mechanics to create this effect:

  • The machinery behind buttons can already handle “trigger something when Obe steps on a space”, including a delay for ending the level.
  • The machinery behind Obe walking in at the start of the level allows us to redirect his movement.

This is one way of handling an edge case – try to reduce it into an example of something you already have, thus changing it from an edge case into a normal case. Now we’ve changed the ‘goal’ space into a different-looking button with a redirect space.

Now, there’s another situation involving the goal space where I was given a similar choice. In some levels, there’s a space both to the left and to the right of the goal space. This enables a situation in which the player moves onto the goal space, and then away from the goal space. This creates a problem: the end-of-level ‘button’ will trigger, the lights will dim and the next level will load, but Obe hasn’t left the scene – he’s still just standing there!

ezgif.com-video-to-gif

Well that’s not quite right…

This is a problem I can solve by changing the rules, or by changing the design. The rules for redirecting Obe’s movement only apply when he doesn’t already have a destination. In order to handle this situation, I could add a case that says “if the current node is the goal node, do the redirection”. This requires that I add code to mark a node as the goal node, and to check if the current node is the goal node. While this code would be pretty small and easy to write, it still adds to the overall complexity of the codebase. Is there a way to avoid doing so?

There is, in fact, and it’s quite easy. If we simply remove all of the places where this could happen, then we don’t have to worry it! We’re not “solving” the problem in a conventional sense – if the configuration of spaces were to come up again, the problem would still occur. However, by changing the level design, we remove any chance of that happening.

1-1 goal with boxes

I’ll have Frank make something more on-theme to fill that space

This is another way of handling an edge case – by making a small change to the level design, we’re able to avoid making changes to the codebase. This prevents our code from becoming needlessly more complex, making it easier to understand and maintain. While not every problem can be solved in such a simple way, there are many that can, and keeping an eye out for them is a great way to avoid unnecessary code complexity.

 

Living on the Edge

I keep talking about edge cases and code complexity like they’re bad things. But an entire game is a very complex thing – doesn’t it make sense for the codebase behind it to be complex as well?

There’s nothing inherently wrong with complexity in your code; a well-implemented cache invalidation algorithm is a beautiful thing, complex as it is. What isn’t beautiful is needlessly complex code. The logic in this code is usually hard to follow, makes assumptions, and leaves a lot of small bugs that you’re unlikely to notice right away. This is a recipe for disaster, because every time you try to make a small change, you have to wade through a swamp of half-thought-out code paths, and you end up adding more complexity just so that you don’t have to deal with the complexity that’s already there!

The biggest problem is that it’s very hard to tell the difference between code that’s complex because it has to be (good) and code that’s complex when it doesn’t have to be (bad). The way I deal with this is to try and realize when the code I’m writing is starting to become very complex. Even though I might only be fixing one bug or working on a specific part of the implementation, I try to take a step back and look at the problem that I’m trying to solve, and how I’m solving it. If the problem is a complex one (cache invalidation), then I accept that it’s gonna be a complex algorithm, and keep writing it. If it’s not a complex problem (sorting), I take another look at my code and see if there’s a better way to do what I’m trying to do. In this way, I continuously re-evaluate the complexity of my code, and whether or not I need it.

Hack

Six while loops isn’t too many, right?

I know that “I just know when it’s too complex” might not be the most satisfying answer for those of you who often run into issues of complexity. That feeling is something that you pick up as you do more and more coding, and especially as you revisit your own code – “wow, I can’t believe I wrote such stupid code”. For those who want a more concrete answer, here are some of the ‘red flags’ that I try to keep an eye out for when assessing the complexity of my code:

  • A lot of ‘if’ statements – If your code has a lot (and I mean a lot) of random ‘if’ statements (especially nested ones), then you might want to take another look at the design.
  • “I don’t know…” – If you can’t quickly and easily determine what each piece of your code is meant to be doing, your design might be too complex.
  • Guessing – If you ever find yourself just “trying things” and “seeing if they work”, it’s a clear sign that you don’t understand your code well enough. Take some time and get to know it!
  • Duplicated code – If you have the same block of code copied into a few places, you should revisit your design. Either that block belongs in a helper that you can reference, or the control flow of your code needs to be reconsidered.
  • Asynchronicity – If you’re doing anything asynchronous, you should give your code another look. I know you probably did it right the first time, but asynchronicity is one of the most difficult parts of computer science, and it’s always worth double-checking.

There are a lot of other things that you might notice about your own code and its complexity – these are just a few quick guidelines off the top of my head. Hopefully they help!

 

But Game Development is Fun!

Anyways, I hope I didn’t scare you away from computer science. If anything, I wanted to instill a healthy fear of needless complexity, and I hope that you’ll do what you can to reduce that complexity – whether by redesigning your code or redesigning your levels!

 

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

If you have any questions about code complexity and how to design around it, or if you have any other questions about Where Shadows Slumber, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber

Hacks Versus Designs

I remember back in the day, when computers and programming were first becoming somewhat ‘cool’. Back then, the coolest thing you could be in the computing world was a ‘hacker’. Hackers were awesome renegades who could tear down opposing systems using nothing but their superior intellect. Being able to hack was one of the best skills you could have. Now, after studying and working in computer science for a while, the term ‘hack’ has taken on a very negative connotation.

When you’re writing code, there are several things that you’re aiming for. The two broadest and most important of these are:

  1. The code works – it does what you intend for it to do.
  2. The code is good – it’s efficient, understandable, and easy to use/improve.

It seems like these two things would go hand-in-hand, and for well-designed code, that is often the case. However, the road to that ‘well-designed’ code is often fraught with terrible, terrible code. So, what’s the intrinsic difference between these two goals, and how does it lead to bad code?

 

boolean

Hack First, Ask Questions Later

When you’re working on a large, intricate system, and you need to add something or make a change, these two goals lead to two different types of results – a hack, or a design:

  • A hack is a piece of code with only the first goal in mind – you’re just trying to ‘make it work’. You don’t want to put a lot of thought or time into the implementation, you just want it to work.
  • A design has both goals in mind – you’re spending time to come up with a good solution. You’re willing to work a little harder to end up with a more robust, long-loving solution.

Designing a solution to a task leaves you with good code. It’s easy to understand, easy to use, and easy to update. The algorithm makes sense, not just in terms of “does it do what I want”, but also in terms of “does it make sense with the theory behind it”.

Looking at these two descriptions, it’s pretty easy to see – designs are better than hacks. So why would anyone ever want to use a hack to get something done? There are a few reasons.

Designs take more time. You have to come up with a solution, consider its long-term viability, consider how it will interact with every part of your system, present and future, tweak it accordingly, and make sure that it still matches the theory of your application. A hack, on the other hand, involves simply coming up with a quick and dirty solution, and implementing it.

Designs require deeper understanding. In order to fully understand the impact of your newly-designed code, you have to completely understand the current state of your application, remember all of the assumptions you made when coding it, and ensure that your new stuff won’t interfere with any existing stuff (Note that this is much harder to do on a larger team, as there are areas of the code you may not be as familiar with).

Designs are often much larger in scope. When designing a solution, it will often involve creating a ‘system’ or ‘engine’ of sorts. Not only does this take longer to think through and implement, but it also opens the door to a lot of subtle interactions between systems. Hacks are (usually) much more localized – “I’m gonna make this hack here, but I won’t use it in other places”.

You don’t want to spend a lot of effort on code that will be replaced eventually. This is really just a combination of the above points, but it’s an important reason why hacks exist. If you have to update a small piece of code, but you know that you’re going to come in and change the whole thing next month anyways, why would you put a lot of time and effort into designing a solution when a quick, hacky fix will do the trick?

Looks about right Cropped

This is what happens when you leave hacks in your code!

 

Here’s An Example

Let’s say you’re you’re working on a pretty simple game in a pretty simple game engine, using a pretty simple programming language (hint: this means I’ll be using pseudo-code rather than real code). You’ve got your character on the screen, and you want to make him move back and forth along some flat ground whenever you hit an arrow key. You might start out with something like this:

if (keys.leftArrow) {
  dudeGuy.position.x -= 10;
}

if (keys.rightArrow) {
  dudeGuy.position.x += 10;
}

Pretty simple and straightforward – if you’re pressing the left arrow key, move your dudeGuy to the left, and if you’re pressing the right arrow key, move him to the right.

So, you use this code for your movement, and it works, and you continue working on your game. Then, suddenly, you have an epiphany – what if your dudeGuy could jump? You add a variable and hook it up:

int jumpingTimer = 0;

...

if (keys.spaceBar && jumpingTimer == 0) {
  dudeGuy.position.y += 30;
  jumpingTimer = 3;
}

if (jumpingTimer > 0) {
  dudeGuy.position.y -= 10;
  jumpingTimer--;
}

As you continue making your game, you design some levels where you realize that you want the gravity to be less strong, so you have to account for that:

float gravity = 10;

...

if (keys.spaceBar && jumpingTImer == 0) {
  dudeGuy.position.y += 30;
  jumpingTimer = 30 / gravity;
}

if (jumpingTimer > 0) {
  dudeGuy.position.y -= gravity;
  jumpingTimer--;
}

Then you realize that your back-and-forth movement looks pretty choppy, so you decide to add some ‘smoothing’, so your dudeGuy speeds up and slows down:

int movingLeftTimer = 0;
int movingRightTimer = 0;
int jumpingUpTimer = 0;
int jumpingTimer = 0;
float gravity = 10;

...

if (keys.leftArrow) {
  if (movingLeftTimer < 3) {
    movingLeftTimer++;
  }
} else if (movingLeftTimer > 0) {
  movingLeftTimer--;
}

if (movingLeftTimer > 0) {
  dudeGuy.position.x -= 10 / (4 - movingLeftTimer);
}

if (keys.rightArrow) {
  if (movingRightTimer < 3) {
    movingRightTimer++;
  }
} else if (movingRightTimer > 0) {
  movingRightTimer--;
}

if (movingRightTimer > 0) {
  dudeGuy.position.x += 10 / (4 - movingRightTimer);
}

if (keys.spaceBar && jumpingTimer == 0) {
 dudeGuy.position.y += 30;
 jumpingTimer = 30 / gravity;
}

if (jumpingTimer > 0) {
 dudeGuy.position.y -= gravity;
 jumpingTimer--;
}

And,  before you know it, with only a few changes to what we were trying to do, we end up with a piece of code that’s incredibly messy, almost impossible to understand, and prone to bugs and off-by-one errors. Honestly, I just wrote this thing, and I have no idea what it’s supposed to be doing.

Now, this example is a bit of an esoteric one, just to prove a point. However, it is definitely not the worst code I’ve ever seen (or written), and that’s saying something. What should we have written instead? Well, if you couldn’t guess, the above code is an example of a hack (or a number of hacks put together). Rather than examining what it was we needed in the long run, we repeatedly implemented something that did the job in the short term. So, let’s make a design for this use-case, and think about what we need overall.

We want to be able to move left/right, jump, have different values for gravity, and have smoothing on our movement. This sounds a bit like actual physics, so lets steal some important concepts from them – acceleration and deceleration. We’ll determine some rules that match our design, modify the dudeGuy’s acceleration in each direction based on those rules, and then move his position all at once:

float maxSpeed = 10;
float acceleration = 3;
float jumpAcceleration = 10;
float gravity = 3;
float friction = 5;
float minY = 0;

float vx = 0;
float vy = 0;

...

// If the left arrow key is down, accelerate to the left
if (keys.leftArrow) {
  vx -= acceleration;
}

// If the right arrow key is down, accelerate to the right
if (keys.rightArrow) {
  vx += acceleration;
}

// If the spacebar is down and the dudeGuy is on the ground, accelerate upwards
if (keys.spaceBar && dudeGuy.position.y == minY) {
  vy += jumpAcceleration;
}

// Accelerate downwards for gravity
vy -= gravity;

// Decelerate for friction
if (vx > 0) {
  vx -= friction;
} else if (vx < 0) {
  vx += friction;
}

// If we're going to fast to the right, slow us down to the max speed
if (vx > maxSpeed) {
  vx = maxSpeed;
}

// If we're going to fast to the left, slow us down to the max speed
if (vx < -maxSpeed) {
  vx = -maxSpeed;
}

// Update the dudeGuy's position based on our current velocity in each direction
dudeGuy.position.x += vx;
dudeGuy.position.y += vy;

// If the dudeGuy is below the ground, move him up to ground level
if (dudeGuy.position.y < minY) {
  dudeGuy.position.y = minY;
  vy = 0;
}

While we have a similar number of lines of code here, it’s much clearer what’s happening on each line. Every block serves an easy-to-understand purpose, and making changes to the ‘rules’ of movement is very easy. There are a lot of different ways to improve this code, depending on your game’s overall design, but this is a decent, and most importantly simple, place to start.

Another important feature of this piece of code is that it is well documented. Every block is pretty small, but it still has a comment describing the purpose of the block. This is an extremely important part of programming in the context of larger systems – you want to make sure that you (or anyone else) can quickly understand what your code is doing, especially in complex cases. Even though some complex logic might seem simple to you, it’ll definitely seem more difficult when you come back to it in 6 months!

 

A Necessary Evil

Unfortunately, hacks are a necessary evil. While I would love to only ever have to deal with and implement beautifully-designed code, that world doesn’t exist. There’s always a timeline, there are always changing assumptions and new features, and there’s always someone who wants it to be finished yesterday. Inevitably, you’re going to have to write some code quickly, implement a feature that’s likely to change, or come up with a simple ‘solution’ to a difficult problem. In cases like this, you’re forced to use a hack.

Hack

I mean, it works… technically…

It’s not all bad, though. While hacks in general are pretty bad, they can be manageable if you make sure to use them correctly. In fact, I would be willing to bet that any system currently in production (of a certain size) contains quite a few hacks. There are certain qualities that hacks can have which make them a little bit more manageable, and you should try to aim for them whenever you find yourself implementing a hack:

  • Understandable – It’s important that, whatever your hack is, anyone else looking at the code can understand what you were trying to do, and how your hack works. This means leaving a lot of comments around your hack, as well as simplifying the logic as much as possible.
  • Localized – If you have to hack something in, you want it to only be in one place. Every time that code path is used, there’s a chance that something will go wrong. If your hack only touches a small part of your system, then its negative effects will be much less noticeable. This means that frequently-used code paths should never really have hacks in them, while hacks in rarely-used code paths are more acceptable.
  • Known – This is, to me, the most important part of making a hack. If you hack something in and then forget about it, when your system starts failing, you won’t know where to look. If you make sure you remember it (by writing it down somewhere and then telling every person you know), then you’ll know where to look if something goes wrong. On top of that, you’ll always have that hack in the back of your mind, so you’ll be more likely to think of a good design to replace it.

If you follow these guidelines and make sure to try to go back and fix them, then putting hacks into your code won’t end up destroying you.

I hope this was helpful to those of you just starting out in game development – or anything which involves designing complex systems! For those of you who already know a little something about computer science, I hope this at least reinforced your burning hatred of hacks!

 

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

If you want to know more about how to deal with hacky code, or what kind of hacks are in Where Shadows Slumber so that you can exploit them, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.

The Name Of The Game

As you (probably) know, Frank and I have been working for a while on a certain game-development project. And, as you also (most likely) know, the name of that project is Where Shadows Slumber. For as long as any of you have known about it, that’s what we’ve called it, so it might seem strange to think of calling it something else at this point. But the name wasn’t always Where Shadows Slumber – for quite a long time, our game didn’t even have a name. How did we get from there to here?

When I first came up with the idea for the game and we started on the proof-of-concept, we didn’t have any particular name in mind. We weren’t thinking about it at all, and we didn’t even have an idea of what kind of name we might want. That apathy followed us through the early phases of the game, up to the point where we started going to smaller events, showing it off to people, and getting feedback. We discussed different naming options, but we never considered it a huge priority, and didn’t dedicate much time to it. Before too much longer, we came to the realization – we need a name for this thing!

 

Why Do You Need a Name?

We were just getting started with a new, unknown game, and, against all odds, it was actually going well! People seemed to really enjoy playing our game. They seemed interested in our process as a small team. We had been perfecting our ‘pitch’ at every event we went to, and we know exactly what to say to people when we showed them our early prototypes. That’s when we realized the mistake we had made.

People liked the game, and they wanted to know more about it. They wanted to hear about updates, they wanted to know when it came out. The problem was, the game didn’t have a name – how can someone keep up with it if there’s no name to search by? That was when we stopped messing around. Making a game is hard, and making a successful game involves making the correct decision at every point in the process. This was a place where we had screwed up, but we resolved to fix that mistake immediately, and I think that our fast action was an excellent decision that did a lot to move us toward success. The decision we made was to meet up in person the following week. We would sit down and figure out a name, and neither of us would be allowed to leave until we had decided on one.

 

What’s In A Name?

Now, choosing a name is a surprisingly difficult thing to do. The biggest hurdle for us, I think, was the dedication that it implied – once you pick a name, once people start using it, you can’t really go back. What if we chose wrong?

whatsinaname

MS Paint forever!

While this was a scary proposition, it was also one of the things you want most out of your name. You want people to remember it and recognize it – you want it to last, and you don’t want to go back. Which just means you have to be that much more careful about choosing it. So lets look at all the things you want from your chosen name.

Recognition – The most important part of your name is that people associate it with your game. For us, when people think of the words Where Shadows Slumber, we want them to think of our game, and only our game. This is associated with having ownership over the name – nothing else is named in a way that’s too similar to Where Shadows Slumber. Take my name for example – Jackson Kelly. Go ahead, give it an image search, I’ll wait.
Do you get a bunch of pictures of my beautiful face smiling back at you, or a bunch of guitars? That’s right, the name Jackson Kelly is already ‘owned’, to some extent, by a guitar company. If I were choosing a name for a company or product, I definitely wouldn’t choose Jackson Kelly, because people (and Google) already associate it with something else.

“Pre-loading” Information – When people sit down and play your game, they won’t always know what to expect. There are some people who aren’t part of your target audience, and they might not like your game. Some games require the right mood or mindset. These are all good examples of how your game’s name can “set the mood”. If your game sounds like a puzzle game, then puzzle gamers will know that it will be good for them. If your game sounds like an endless runner, people will know what to expect. This leads, perhaps even subconsciously, to people more often playing your game when they’re interested in the style of the game, and when they’re in the mood for it. This also applies to people following your progress and keeping up with your development.

Telling a Story – Every game has a narrative of some sort – not necessarily a story in the conventional sense, but something you want your players to experience, outside of the mechanics themselves, when they play your game. For a game like Where Shadows Slumber, this is a literal story – something is happening in the world of the game, and the player gets to watch it happen. Other narratives aren’t so straightforward; take Candy Crush, for example. I’ve never played it, but I assume there isn’t really a huge storyline. Rather, what you want the user to experience are the rules of the candy world, and why the player should be connecting the candies.

Whatever the narrative, everything about your game should speak to it, should play a part in making it happen. The name, as the first part of your game users will interact with, is a vital piece. It’s where the journey begins, and you want to make sure that it helps tell your story.

Representing Your Game – Every part of your game should be great, but the most important part of your game is the beginning – can you get a user “hooked”? The name of your game is the first part of your game a potential user will experience, so it should, arguably, be the best part of your game. If you clearly didn’t put a lot of thought into the name, how can people trust that you put any effort into the game itself? [Editor’s note: see “Mr. Game!” for reference] The name is part of the game, and it should be treated as such.

 

How We Came Up With the Name

As I mentioned earlier, the way we came up with the name was to have a few rough ideas in our heads, and then to sit down and get it all done in one session, cagematch-style. Perhaps this wasn’t the most efficient way to get this done, but it stopped us from dragging our feet, which had been the biggest problem. So, we met up at 10 am on a Saturday, and got into it!

naming5

A spattering of words and concepts we considered using.

The first thing we did was to brainstorm – not for names, but for emotions. People buy most of their entertainment products based on emotion, and games are no different. What emotions do we think players will feel while playing, and what do we want them to feel? What kinds of emotions will motivate them to buy it and to keep playing it? By answering these questions, we started to figure out the tone our name should have. The emotions we decided to shoot for, to various degrees, were mystery, fear, suspense, and hope.

Once we had some emotions, we started to focus on the actual content of the name. Our name should be indicative of the things in the game, and, in particular, of the story players will find within. What are our main mechanics and story points? What words can we find for those things that fit within the emotions we chose? Again, we’re not thinking about actual names yet (for the most part), but just building up a collection of words. We ended up with quite a few, but some of the major ones were umbra, nimbus, slumber, wraith, and plenty of others.

After that, we finally got started on actually choosing a name. We tried to combine the words we had come up with into sensible, interesting names. We came up with quite a few, decided on our top four favorites, and made a little bracket. We discussed each of the names at length – what will people think, will it help us connect with players, are there other games with similar names – and eventually narrowed the search down to Where Shadows Slumber!

naming4

The final four!

This whole process took upwards of eight hours. It was an exhausting day, but I think we ended up with a pretty good name at the end of it all.

 

Aftermath

When we first decided on the name Where Shadows Slumber, I was pretty apprehensive, and I think Frank was too. We didn’t want to commit to a name that might not have been 100% perfect. That said, we knew we had to make a decision, so we did.

In the end, I’m really glad we settled on Where Shadows Slumber. I think the name does a lot to describe what our game will be like, we have good ownership over the name, and it really just seems to fit. It was a heck of a process, but I think we made the right choice at the end of the day!

 

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

If you want to know more about our naming process, feel free to contact us! You can always find out more about our game at WhereShadowsSlumber.com, find us on Twitter (@GameRevenant), Facebookitch.io, or Twitch, and feel free to email us directly with any questions or feedback at contact@GameRevenant.com.

Jack Kelly is the head developer and designer for Where Shadows Slumber.