btCollisionShape::setLocalScaling seems to have no effect

[jbacon]

Hi,

Im using Bullet 2.73 under msvc8 pro. Im running into the issue that
calling setLocalScaling( btvector3( 0.5, 0.5, 0.5 ), on a rigidbody
that has a btCylinderShapeX collisionshape doesn't seem to have any
effect; when I check the effective size of the collsion object in my
scene using raycasting, it's as if it's not scaled down at all.

any hints ?

Thanks,

J

[jyrenth]

I'm getting the same problem with a Box collision shape.

[Nacho]

In the btCylinderShape class, the virtual method setLocalScaling is no overwrite, and when you call it, the btConvexInternalShape::setLocalScaling is calling, that only set the m_localScaling member.

Copy setLocalScaling from btCapsuleShape.h to btCylinderShape.h (for example after getRadius method) and it works:

Code: Select all

	virtual void	setLocalScaling(const btVector3& scaling)
	{
		btVector3 oldMargin(getMargin(),getMargin(),getMargin());
		btVector3 implicitShapeDimensionsWithMargin = m_implicitShapeDimensions+oldMargin;
		btVector3 unScaledImplicitShapeDimensionsWithMargin = implicitShapeDimensionsWithMargin / m_localScaling;

		btConvexInternalShape::setLocalScaling(scaling);

		m_implicitShapeDimensions = (unScaledImplicitShapeDimensionsWithMargin * m_localScaling) - oldMargin;

	}

Nacho

[Erwin Coumans]

Please report an issue in the tracker with patch.

Thanks a lot,
Erwin

[Nacho]

http://code.google.com/p/bullet/issues/detail?id=393

Nacho.