Make it harder to retrieve a mutable attribute from const a const mesh,
and use the attribute search function to check multiple domains and
colors at once.
* Renamed BKE_pbvh_raycast_project_ray_root to
BKE_pbvh_clip_ray_ortho for greater
clarity.
* BKE_pbvh_clip_ray_ortho no longer strictly clips
within the input ray interval. This is not necassary
for orthographic views and was too prone to floating
point error. The function is only called to clip
brush rays for orthographic views so this is acceptable.
Split much of BKE_pbvh.h into BKE_pbvh_api.hh.
BKE_pbvh.h is included by BKE_paint.h, which in
turn is included by large amounts of code including
RNA.
This makes it extremely difficult to change
or clean up the PBVH API, since each modification
of BKE_pbvh.h can take 20-30 minutes to compile,
even on a quad-core system with an SSD. This
commit fixes that by moving most of BKE_pbvh.h
into another file and just having the core,
external-facing interfaces in BKE_pbvh.h.
Hans Goudey
Ray Molenkamp
Joseph Eagar