PlanB - FPS Game

PlanB is an easy to pick up FPS game
perfect for LAN parties and casual players.

PlanB - Making of an Indie FPS


I would like to talk about the making of the first game I developed. Well the first game is not entirely true, I have written very very simple games before I had started working on PlanB. But I did have very limited programming experience prior to PlanB.


So what motivated me to get into game development in the first place was that I loved shooter games. At the time I had two favourite games, which where “Call of Duty: Black Ops” and “Cube 2: Sauerbraten”.

I have always wondered how I could create my own maps and weapons for these games.

More Story Time

I knew Sauerbraten is an open source game and I even managed to compile it myself after a lot of fiddling around with Make.

However, I really wasn’t ready to understand its source code. I only had limited programming experience in AutoIt and BASIC up to that point. So I gave up on C++ and trying to understand the source code.

After a while I discovered some other guys on YouTube using the Unity3D game engine to program their games in.

A few notable of the early guys I discovered where:

These people inspired me to pick up the Unity3d game engine also, which was in version 3.something the first time I picked it up.

For quite a while all I did in Unity was to play around with the bootcamp and the island FPS demo. But after a while I joined OneManArmy’s forum called and used his FPS kit to learn from it and play around with it.

There where some really cool guys on youtube doing coding tutorials to teach a noob like me also.

Most notable where:

But I did learn most from the ArmedUnity community. (Which btw. it is meant to be understood as: “armed with unity”).

There where great people in the communty. Too many to mention all of them here. However, a guy named OcularCash helped me a couple of times directly.

Also I would like to mention theMars2011 here, who joined the forum a little bit later than me but is now working on a really impressive title with a small team of developers:

Development of PlanB

So after I figured that I have done enough ground work and know how a FPS works in theory I wanted to finally build my own fps pretty much from scratch.

Most of the structure was inspired by OMA’s FPS Kit and Guides by other people in the community. However, in the beginning I wanted to create everything on my own (and I mostly did).

So without much planing of what the goal of the game should be I started to code the character controller, weapon scripts etc., started modeling and animating the weapons. This was from what I remember done in a single week before I uploaded this video:

I wanted PlanB to become a story based multiplayer FPS game, a SciFi-WW2 shooter and also already modeled weapons for that.


However, you can already guess that this is a very strange idea. Realizing that and that it doesn’t make any sense I scrapped the whole story and models. Instead I decided to go for a simple multiplayer game in a completely fictional setting.


I ended up scrapping all of the previous player and weapon models and decided to design weapons by myself using Krita and Gimp.

Here you can see Pictures and 3D Renders of the Designs I came up with:


After designing the weapons, modeling them, texturing and recording sounds for them I ended up with a set of 10 weapons that I would keep. (About 5 weapon designs got scrapped.)

Here is a video of all the weapons with sound in the game:

I wanted to focus on the gameplay first and to test things out I implemented a simple zombie AI that would chase and attack the player. Also I wanted to be able to save settings, progress and other things in an easy manner. I figured that the tooling that was already there was insufficient for me and thus I created my own simple key-value store solution along with some editor scrips to go along with it:

You can check the tool I developed for savig the game out here:

Around this time I also added a class editor into the game that would let you create “classes”, which are just a selection of preferred weapons, skins and perks:


So after trying to polish most of the basic functionality I made this video:

I thought I would like to have a Fallout (Fallout3 to be more specific) like wasteland as a map and figured that I could probably save a lot of time with level design by just having everything procedurally generated.


So I first needed to write a tool to help me create seamless pbr materials. I ended up writing a simple java tool that uses some tricks but ends up with pretty nice results:

Video Demo:

I made a trip to the woods and took photos of textures with my camera. Then I started to write some basic terrain generation script that generates a height map for the terrain to use by layering perlin noise with a different frequency and amplitude on top of each other.

I wanted to have a bigger terrain than what Unity supports by default. But there was an easy fix: just stitching multiple terrains together. Using the size of the terrain so far an offset for the perlin noise function makes the terrains stitch together perfectly.

After I had all that working I realized that this is not enough. The tiling in the terrain was too obvious, so I decided to write a custom terrain shader also, that would have harder blending between the textures and uses many cheap tricks to hide the tiling. Like overlaying a perlin noise texture to control the hue and blending with a bigger version of the same terrain texture based on the distance to the camera.

That means if you are close to the texture it will display the scaled down version of the texture for detail, but if you are further away from the texture the opacity of the scaled up version increases to hide the seams and patterns of the detailed version of the texture.

Now I only had to make a slight adjustment to correct the normals of the vertices of at the edges of the terrains that I have stitched together. Because there where no neighbouring vertices to figure out the correct normal orientation at the edges, these vertices created a seam where the terrains got stitched together.

After solving this issue the generated Terrain looked like this:

terrain.png terrain2.png

Note here that the Buildings, Trees and other Vegetation have also been procedurally placed in locations where it makes sense.

This tool is also open source and you can get it for free here:

However, after a while I figured that I can surely generate huge maps with this tool, but the resulting map is boring to play on.

Hence I decided to build out a map manually with the help of the asset store and a friend. We ended up with this map:


Which also is the currently used map. Only some tweaks where left to do like enabling server configuration through a .conf file. And also removing claymore mines from the game.


These things where buggy, useless and annyoing in multiplayer, so I decided to just remove them.

LAN Gameplay:

At the end this turned out to be really fun game for LAN parties and it is available for Windows, Mac and Linux here:

I discontinued the official server. But it is really easy to host your own as described on the download page.

I hope you can try and enjoy the game with some friends!

What I learned:

Even though this game didn’t tun out as the next COD, as I have wanted when I started as a young teen, this game turned into a fun shooter to play at LAN parties.

Also the real value this project gave me lies in the things I have learned along the way.

This includes but is not limited to:

You can download the game for free here:

More Projects

I have a worked on many programs and other projects Most are not worth mentioning here.

Some projects are open source and can be found on my GitHub Profile.
Feel free to check them out!

Most projects coming in the future will be published on at: