[x3d-public] Understanding of the RigidBody specification

[microaaron at pku.edu.cn]

Hi:

I am confused about the rigid body physics component specification.

Since a RigidBody can contain multiple CollidableShapes, in this example 'RB_1' contains 'CS_1' and 'CS_2'. So should 'CS_1' and 'CS_2' be treated as one object as if stuck with glue, or two objects that can move independently?

If multiple CollidableShapes contained in this RigidBody belong to different CollisionSpaces, how should we understand this situation?




Thanks.




<RigidBodyCollection>
  <RigidBody DEF='RB_1' mass='100'>
    <CollidableShape DEF='CS_1'>
    </CollidableShape>
    <CollidableShape DEF='CS_2'>
    </CollidableShape>
  </RigidBody>
  
  <RigidBody DEF='RB_2' mass='200'>
    <CollidableShape DEF='CS_3'>
    </CollidableShape>
  </RigidBody>
</RigidBodyCollection>


<CollisionSpace  DEF='Space_1'>
  <CollidableShape USE='CS_1'>
  </CollidableShape>
</CollisionSpace>


<CollisionSpace  DEF='Space_2'>
  <CollidableShape USE='CS_2'>
  </CollidableShape>
</CollisionSpace>


<CollisionSpace  DEF='Space_3'>
  <CollidableShape USE='CS_3'>
  </CollidableShape>
</CollisionSpace>


<MotorJoint>
  <RigidBody containerField='body1' USE='RB_1'>
  </RigidBody>
  <RigidBody containerField='body2' USE='RB_2'>
  </RigidBody>
</MotorJoint>
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