heighfield: buildAccellerator()
This enables accelleration of heightfield collisions.
Unfortunately, btHeightfieldTerrainShape::processAllTriangle does not
yet use the accellerator data, so this change does not improve
performance yet but might do so in future bullet versions.
References:
-
Accellerator introduced in: https://github.com/bulletphysics/bullet3/pull/2062
-
Feature request to use the accellerator in
processAllTriangle: https://github.com/bulletphysics/bullet3/issues/3276