Alexander Gavrilov
0a2a006775
Since the collision modifier cannot be disabled, it causes a constant hit on the viewport animation playback FPS. Most of this overhead can be automatically removed in the case when the collider is static. The updates are only skipped when the collider was stationary during the preceding update as well, so the state is stored in a field. Knowing that the collider is static can also be used to disable similar BVH updates for substeps in the actual cloth simulation code. Differential Revision: https://developer.blender.org/D2277