Raycasting engine improvement
Raycasting engine improvement

Use a faster and more accurate raycasting algorithm from:

  Amanatides, John, and Andrew Woo. "A fast voxel traversal algorithm
  for ray tracing." Proceedings of EUROGRAPHICS. Vol. 87. 1987.

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@iki.fi>

penberg/wolf