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Since rigid bodies need their world to be be updated correctly we now
pass it alongside the parent scene in scene_update_tagged_recursive().
Add BKE_object_handle_update_ex() as well as other object functions
that take a RigidBodyWorld for this.
Ideally this shouldn't be needed but we'd have to restructure scene
handling for that. It's not a small taks however and definitely not
something that can be done before release.
Thanks to Campbell for review.
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This will preserve constraint <-> rigid body realationships so
constraint setups aren't broken after duplication.
Based on a patch by Brandon Hechinger (jaggz), thanks.
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This allows moving rigid bodies on frame > startframe.
Also rigid bodies can now be picked up and trown around while the
simulation is running.
Note: There is a small glitch with cancelling tansform during simulation
but it's tricky to get rid of.
TODO: Avoid static-static collision warnings
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This is just the basic structure, the simulation isn't hooked up yet.
Scenes get a pointer to a rigid body world that holds rigid body objects.
Objects get a pointer to a rigdid body object.
Both rigid body world and objects aren't used directly in the simulation
and only hold information to create the actual physics objects.
Physics objects are created when rigid body objects are validated.
In order to keep blender and bullet objects in sync care has to be taken
to either call appropriate set functions or flag objects for validation.
Part of GSoC 2010 and 2012.
Authors: Joshua Leung (aligorith), Sergej Reich (sergof)
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