Xyzengine
A game engine written in Java using the LibGDX game development library. It support directional lights, physics using JBullet and a destructible voxel terrain.
The physics were a challenging task, an unoptimized voxel engine is impossible to run on modern systems because you can’t add every cube as a collidable object. For example, this scene is about 32 blocks high, 256 blocks wide and 256 blocks in length. Then the physics engine would have to check 32256256 = 2097152 different instances of cubes. Not really achievable for my shitty laptop at the time. (But still not now)
To remedy this, I used a greedy meshing algorithm with the help of this great writeup on 0fps.net.
This algorithm basically tries to combine as much cubes in a single cube. Which makes it possible to combine everything in the scene into bigger and less objects. You can see this in the following screenshot which shows all the physics objects in the scene.
The better physics system allowed for some fun sandbox sessions.
