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heighfield: buildAccellerator()

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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
This commit is contained in:
Gleb Mazovetskiy 2021-02-26 09:54:02 +00:00
parent 92300733c5
commit 21a70b7d2b
1 changed files with 6 additions and 0 deletions
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6
apps/openmw/mwphysics/heightfield.cpp
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@ -58,6 +58,12 @@ namespace MWPhysics
mShape->setUseDiamondSubdivision(true); mShape->setUseDiamondSubdivision(true);
mShape->setLocalScaling(btVector3(triSize, triSize, 1)); mShape->setLocalScaling(btVector3(triSize, triSize, 1));
// Enables acceleration of heighfield collissions.
//
// Bullet does not yet use this in the most time-consuming method, `btHeightfieldTerrainShape::processAllTriangle`.
// See https://github.com/bulletphysics/bullet3/issues/3276
mShape->buildAccelerator();
btTransform transform(btQuaternion::getIdentity(), btTransform transform(btQuaternion::getIdentity(),
btVector3((x+0.5f) * triSize * (sqrtVerts-1), btVector3((x+0.5f) * triSize * (sqrtVerts-1),
(y+0.5f) * triSize * (sqrtVerts-1), (y+0.5f) * triSize * (sqrtVerts-1),