Ash

I added ramps to my pixel art voxel game by cutting the existing cubes. There are 4 ramp planes and 8 corner planes, and keeping either side of each cut gives me 24 shapes. The GPU checks which side of the plane each pixel is on. The slope uses the block's top texture sampled by world position, so the grass carries straight over it. I had to fix the shadows because they still thought the ramps were cubes. The shadow ray needs to check the cut plane when it enters one of those blocks, otherwise I get sawtooth triangles. AO was also darkening the ground at the foot of each ramp like a full wall stood there.