Blender Git Loki

Edit Mesh: multi-thread auto-smooth sharp-edge calculation

Merge the sharp edge tagging into bm_mesh_loops_calc_normals,
this has the advantage that edge tagging can be performed as part of
walking over each vertices edges - instead of tagging in a separate loop.

Even though this will tag edges twice (once for each vertex),
the computation isn't heavy as it's only calculating a dot-product
between the two face users to compare the angle.

This change combined with 4ba06ad0a8cdec66d9a9cb06f982736d46c40f4c
makes BM_loops_calc_normal_vcos around 5.68x faster,
with an overall speedup over 2.6x when transforming a high poly mesh.
(tested on a system with 32 cores).

Reviewed By: mont29

Ref D11970