does getUnscaledPoints in btConvexHullShape really work?

[nornor71]

i want to use the function "getUnscaledPoints" in btConvexHullShape to change all position of vertex every frame,beacuse my object is binded to skeleton.but it seems not work at all,btConvexHullShape didn't update and stay on original shape,here is my code:

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for(int ii = 0;ii< ((btConvexHullShape*)(rigidShape->getPointer()))->getNumPoints();ii++)
			{
				 
				 
				f32 tmp = ((S3DVertex*)(((IAnimatedMeshSceneNode*)Model)->getMesh()->getMeshBuffer(i)->getVertices()))[ii].Pos.X;
				 
				((btConvexHullShape*)(rigidShape->getPointer()))->getUnscaledPoints()[ii].setX(tmp);
				f32 tmpAfter = ((btConvexHullShape*)(rigidShape->getPointer()))->getUnscaledPoints()[ii].getX();
			 
					((btConvexHullShape*)(rigidShape->getPointer()))->getUnscaledPoints()[ii].setY(((S3DVertex*)(((IAnimatedMeshSceneNode*)Model)->getMesh()->getMeshBuffer(i)->getVertices()))[ii].Pos.Y);
				((btConvexHullShape*)(rigidShape->getPointer()))->getUnscaledPoints()[ii].setZ(((S3DVertex*)(((IAnimatedMeshSceneNode*)Model)->getMesh()->getMeshBuffer(i)->getVertices()))[ii].Pos.Z);
				
			}
			 
			((btConvexHullShape*)(rigidShape->getPointer()))->recalcLocalAabb();
			 
			 		}

anyone has experiment of converting binded skin to rigidbody and update shape? thanks for your answer.

[Erwin Coumans]

You should be able to change the vertices/points in a btConvexHullShape.

Just make sure to invalidate/remove the existing contact points. You can do this by removing and re-adding the object to the world. Alternatively, you can use the following snippet:

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//clear all contact points involving the object. Note: this is a slow/unoptimized operation.
m_dynamicsWorld->getBroadphase()->getOverlappingPairCache()->cleanProxyFromPairs(
object->getBroadphaseHandle(),
getDynamicsWorld()->getDispatcher()
);

Thanks,
Erwin