You might want to take a look at Craft[0] which is a simple clone of Minecraft implemented in C, that should get you the basic idea of a voxel engine since the

You might want to take a look at Craft[0] which is a simple clone of Minecraft implemented in C, that should get you the basic idea of a voxel engine since the codebase is quite minimal for the available features. [0] https://github.com/fogleman/Craft https://github.com/fogleman/Craft