The bullet shape: btGImpactShape?

www20602 · June 28, 2019, 1:59am

I recently asked a question in the Bullet forum:
https://pybullet.org/Bullet/phpBB3/viewtopic.php?f=9&t=12709

It seems the cd between trimeshes will lead to wierd physical results.
The suggested solution is btGImpactShape. Is there any plan to include this shape in Panda3d?

Moguri · June 28, 2019, 2:54pm

~~There are no plans to add this shape, but this seems like a good, straight-forward feature request to add to the issue tracker. In the meantime, would btConvexHull work for you?~~

Never mind what I said, I found btGImpactShape is already supported via Panda’s BulletTriangleMeshShape by using dynamic=True in the constructor. This will change the underlying Bullet shape BulletTriangleMeshShape uses under-the-hood from btBvhTriangleMeshShape to btGImpactShape.

www20602 · June 28, 2019, 11:22pm

Thanks. I also found it in the source.

github.com

panda3d/panda3d/blob/5f72e9c763e328dee6fa8591b40d2fa09f58539b/panda/src/bullet/bulletTriangleMeshShape.cxx

/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file bulletTriangleMeshShape.cxx
 * @author enn0x
 * @date 2010-02-09
 */

#include "bulletTriangleMeshShape.h"

#include "config_bullet.h"

#include "bulletTriangleMesh.h"
#include "bulletWorld.h"

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But anyidea why the problem happens?

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