There's nothing about "voxels" that implies raytracing has to be used. And marching cubes is actually a method to get rid of voxels, in a sense. You don't use

There's nothing about "voxels" that implies raytracing has to be used. And marching cubes is actually a method to get rid of voxels, in a sense. You don't use marching cubes if you want that ridged low-res voxel effect.