Undelete get_normal(bvh) w/o precalculated normals
Undelete get_normal(bvh) w/o precalculated normals

ukoeln-vis/ctpperf,szellmann/visionaray,tu500/visionaray,ukoeln-vis/ctpperf,tu500/visionaray,szellmann/visionaray