Today, in my first Social Gaming lecture, I found myself thinking about Game Theory, specifically the Prisoners’ Dilemma, and how to translate this into an actual game. For those of you, who aren’t familiar with this gedankenexperiment, I will outline it in a few sentences, the others can safely skip the following paragraph.

The basic idea is that you have two prisoners, A and B. The two of them committed a crime together, but you cannot exactly prove it. Both of them get the same deal: rat out on the other and go free, the other gets to serve three years in prison. If both talk, both get a two year sentence, if both keep their mouths shut, both will get one year. They are held separate from each other and have no means to communicate. Now, while it would be more beneficial for them collectively to keep silent, each individually would always benefit from betraying the other, resulting in a higher penalty for both of them, than they would have to serve, if they cooperated.

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It’s again time to post about the current project going on at university. We are creating games for use with a custom controller. This controller has some unusual control devices, like linear and rotary encoders, as well as conventional input methods like buttons and an accelerometer. Also it is not very ergonomic. If you want to know more about the device, you can find informations and images here on the Chair’s website.

For my project I chose to create a tank game, but not the obvious control-each-track-separately-with-one-of-the-two-linear-encoders kind of tank-game, but one inspired by the all time classic arcade game Pong. Two tanks, one at each edge of the screen, move along a straight path ad try to shoot each other. In between is a city block, which can be used to hide from the enemy’s attacks. This cover is completely destructible and after a couple of minutes there are only two places to hide left, one on each side of the screen. Additionally there are some powerups to vary the gameplay a bit, like carpet-bombers, shields and cover-piercing railguns.

Initially I wanted to make this a two-player game, with each player using one set of controls on one single controller to steer their tank, but the placement of the rotary encoders, used for the rotation of the tanks turrets, made this impossible. The two players would interfere with each other, because they are so close together. So instead I chose to write a simple artificial intelligence and made this the purpose of the exercise. This A.I. is of course nothing sophisticated. It is a simple state machine which can switch between hiding, attacking, defending and collecting pickups. Each state uses multiple raycasts to  find the best position to hide or fire from, always trying to keep cover between the player and the enemy or finding the spot with the least amount of cover to fire through, respectively. And since it is so simple, it is really difficult to kill initially, since it seems to have perfect aim and always knows where to hide. Until you see through its simplicity, at which point it becomes nearly trivial. It can still land some lucky hits, but the player should be able to easily keep the upper hand.

A second, even simpler A.I. was used to control the soldiers trying to traverse the battlefield. They also use raycasts to detect obstacles, but then simply move up or down until the way to the other side of the screen is free again. When they are close to an enemy soldier, they try to kill each other.

To test the game’s mechanics without having access to the controller at home, I also created an alternative control scheme, using the keyboard. W/S to move up/down, A/D to rotate the turret, Spacebar to fire the main gun, Q for the small lasers and E to use your current powerup. If you want to try it, here you can find an alpha build.


As advertised, here is an executable version of the DX/C++ project I worked on at University. It is a small space ‘game’, or rather the beginning of one. The task was to create a simple game using the DXUT framework. It included procedural terrain generation, working with vertex and index buffers, HLSL shaders, particle effects, movement and collision detection. Originally the player was to be in a stationary turret, firing on enemies that would spawn at random positions and fly across the terrain, but that wasn’t interesting enough for me, so I modified it a bit.

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Since the practical course at University is finished, I now present you the final submitted state of the puzzle platformer. The single existing level is a bit short and the puzzles don’t really deserve that label, but it shows the assets and functionality. Once the level is finished, it will be loaded again.

Here is a screenshot:

And here you can download it.

After trying to wrap my head around procedural mesh generation in Unity for hours and failing repeatedly, I decided to use Unity’s Line Renderer instead of generating a real mesh. Besides being easier by orders of magnitude it also helps keeping the polycount down, while offering good visuals, although it seems to ignore most of my material’s properties. Not sure if I can get this under control. I kept the curves I calculated, and created an empty for each sub-Spline with a Line Renderer Component using the points calculated for the respective subspline.

Here is the finished code. Sadly it doesn’t have the instant feedback in the Editor anymore, but I had to remove the ExecuteInEditMode. The objects created weren’t cleaned up properly when returning from PlayMode. If I find a way to have both, I will update the code.

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For my current project I need some way to show the player which button does what. The easiest and way that doesn’t show too much or annoy the player is some wires connecting the buttons to their respective mechanisms. First I created some models, but I wanted more, so I decided to write some code to procedurally create wires between two objects.

I divided the problem into three smaller problems:

  • create a Master Spline between two objects that curves according to gravity (cosh(x))
  • create multiple sub-Splines that curl around the Master Spline
  • create the actual mesh by creating and connecting vertices around the sub-Splines

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I teased a bit about my current project in my last post about squishy bones in Unity, and I figured I should finally put some information up. It is the final project for the practical course at university, with the requirement of being a platformer. I decided to create a 2.5D puzzle-platformer-hybrid, starring a blob of jello (after attempting and failing to recreate a look I wanted to use for a short-movie once).

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Added two more enemies. A flying saucer that fires lasers in a spiral pattern and mines that are deployed in random minefields. These mines explode on impact (obviously) and can be shot down. Additionally, they are magnetic, so when the player comes to close, they start tracking him, but he can fairly easily move out of range again. Probably into the range of another mine, evil grin. Sometimes the last resort is a Smartbomb. Just like with asteroids, the player’s guided missiles will not lock on to mines, but unlike asteroids, enemies can pass through mines unhindered and enemy projectiles also won’t destroy them.

Lastly the spacecraft from the last post are now created in groups of five, flying one behind the other, just like in the good old days of SHMUPs. It is slowly getting crowded on screen. I might have to create real enemy patterns soon instead of just spawning them more or less randomly, to make it less luck dependent.

I updated the uploaded build, so you can try it and see how long you survive. Did I mention that I halved the players health?

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I added the first enemies. A stationary rocketlauncher that fires three unguided rockets in quick succession and a spacecraft that fires some lightning projectiles and moves in a sinus-shaped path. I initially wanted the rockets to be destructible by player projectiles, but they are to small to really be hittable, so I scrapped that idea. Only the laser was really able to destroy them and I thought that would be an unfair advantage. But they’re easy enough to avoid.

As a side note: I suck at texturing. Also I have some strange shading errors on the wings of the spacecraft. They are just visible in Unity, no such errors in Max. Have to fix those somehow.

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Last post for today. Now I have posted more today than in the last six months together.

I created a ship selection scene to replace the ugly buttons. Still untextured, but it works. I might add some GUI overlays to describe the current selected ship later. When you die in the game, you will be returned to that scene (currently without any transition, so it might be a bit disorientating). Arrows or A and D to cycle the ships, space or return to select. Same download link as before.

(Background music: Street Fighter II ‘Guile’s Theme (R.A.H. Mix) by Rayza,