Unnecessary assert in dgSkeletonContainer

[Lax]

Hi julio,

in debug mode, I always get an assert in Finalize method of dgSkeletonConainer:

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dgAssert (((rootBody->GetInvMass().m_w == dgFloat32 (0.0f)) && (m_skeleton->m_child->m_sibling == NULL)) || (m_skeleton->m_body->GetInvMass().m_w != dgFloat32 (0.0f)));


because the m_skeleton->m_child is null. But it is correct, since I'm creating empty joints in order to be able to call:

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this->joint->setCollisionState(this->jointRecursiveCollision->getBool() == true ? 1 : 0);


So that when e.g. a door is moved via JointSlider, it does not collide with parent joints.
I tested in release mode and the physics behave correctly.
The problem is, that I cannot debug correctly since this assert always throws.
Would it be possible only to check against m_skeleton->m_child->m_sibling == NULL, if m_skeleton->m_child is not null?

Best Regards
Lax

[Julio Jerez]

you are connecting two static bodies with a joint

[Lax]

Yes, I have the following scenario:

• I have a gate, that uses a slider joint in order to open
• The gate is within a tower
• I set the tower as parent joint and set joint recursive collision to 0, so that the gate does not collide with the tower.
• Issue: The gate moves higher as the tower and collides with the next tower pease, so that it cannot be opened fully.
• I thought I could set the second tower above the gate tower as joint parent of the first tower in the and set recursive collision to zero. In the hope that the gate does also not collide with the second tower. That worked, but assert occurs.

But now I found out, that no body does collide with the second tower anymore. So this approach does not work I think.

[Julio Jerez]

There can't be a joint between two static bodies.
There should be an assert to advice against that.
I see if it is still there.

[Lax]

Yeah you are right.