Bullet Soft Bodies cannot have their debug drawing disabled

[Ashley Whetter]

BulletSoftBodyNode implements BulletBodyNode which has the setDebugEnabled method. Calling .setDebugEnabled(False) on a soft body does not turn off the debug drawing for that object. This doesn't happen to BulletRigidBodyNodes.

Attached is a reduction case. Nothing should show (unless you uncomment the geometry code) but the wireframe and anchor points are drawn.

[Ralf Pfrogner (ralf-pfrogner)]

It is true that debug rendering of a soft body can not disabled via node.setDebugEnabled(False).

However, the cause is within Bullet itself and not the Panda3D Bullet module:
btSoftRigidDynamicsWorld::debugDrawWorld() does not check the collision flags of the individual soft body.
It would be easy to amend the Bullet source code, e. g.

"""
btSoftBody* psb=(btSoftBody*)this->m_softBodies[i];
+if ((psb->getCollisionFlags() & btCollisionObject::CF_DISABLE_VISUALIZE_OBJECT)==0)
+{
  ...
+}
"""

So far I do not see a way to work around this inside our own code.

[Ashley Whetter (awhetter)]

I've submitted a bug to Bullet. https://code.google.com/p/bullet/issues/detail?id=795
Thanks.

[Ralf Pfrogner (ralf-pfrogner)]

Ok, and thank you.

The only way to work around would be to derive from btSoftBodyWorld, and overwrite the virtual debugDrawWorld method with a fixed version. But this seems a bit heavy for me, and is likely to get us in trouble with newer version of Bullet.

[rdb (rdb)]

Closing since it is not a Panda bug.