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Fix physics to not trigger Bullet assert in Debug

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When physics attempts to move by a very small amount, precision losses
caused Bullet to trigger an assert in debug from normalizing a zero
length vector.
This commit is contained in:
slothlife 2014-06-07 19:26:12 -05:00
parent 0668019c86
commit 51c45796b1
1 changed files with 22 additions and 6 deletions
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16
apps/openmw/mwworld/physicssystem.cpp
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@ -299,6 +299,8 @@ namespace MWWorld
continue; // velocity updated, calculate nextpos again
}
if(!newPosition.positionCloses(nextpos, 0.00000001))
{
// trace to where character would go if there were no obstructions
tracer.doTrace(colobj, newPosition, nextpos, engine);
@ -309,6 +311,20 @@ namespace MWWorld
remainingTime *= (1.0f-tracer.mFraction); // FIXME: remainingTime is no longer used so don't set it?
break;
}
}
else
{
// The current position and next position are nearly the same, so just exit.
// Note: Bullet can trigger an assert in debug modes if the positions
// are the same, since that causes it to attempt to normalize a zero
// length vector (which can also happen with nearly identical vectors, since
// precision can be lost due to any math Bullet does internally). Since we
// aren't performing any collision detection, we want to reject the next
// position, so that we don't slowly move inside another object.
remainingTime *= (1.0f-tracer.mFraction); // FIXME: remainingTime is no longer used so don't set it?
break;
}
Ogre::Vector3 oldPosition = newPosition;
// We hit something. Try to step up onto it. (NOTE: stepMove does not allow stepping over)