small bvh fixes:
*allow to create any tree type >= 2
*save split axis
changed shrinkwrap to perform normal cast with raytree and bvh tree and print both times:
Shrinkwrap (OBCube)24578 over (OBSuzanne)504482
target = raytree_create_from_mesh(calc->target): 1260.000000ms
shrinkwrap_calc_normal_projection_raytree(&calc): 1850.000000ms
tree = bvhtree_from_mesh_tri(calc->target): 3330.000000ms
shrinkwrap_calc_normal_projection(&calc): 3780.000000ms
On general query time is bit smaller on bvh tree..
but the build time of bvh is pretty big.
(build time can be removed from both if a cache system is added)
But I am still trying to see how fast I can make the bvh build
d674041f2b