Real-Time Physics Simulation Forum 2010-12-09T00:11:47+00:00 https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/6099 2010-12-09T00:11:47+00:00 2010-12-09T00:11:47+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=21285#p21285 <![CDATA[Bullet + Blender + COLLADA + compound objects = bug?]]>
I'm not sure if I'm making some mistake or if I've found a bug. I really hope it's the former!

Let's say I'm exporting a 2x2 rigid body cube and a 0.8x0.8 rigid body cube from blender 2.49b using the COLLADA 1.4 exporter plugin (0.3.162)

When I export, and I look inside the *.dae, I find this:

Code: 

<shape>    <box>        <half_extents>1.00000 1.00000 1.00000</half_extents>    </box></shape>...<shape>    <box>        <half_extents>0.40000 0.40000 0.40000</half_extents>    </box></shape>
... which is correct as far as I can see. But! If I make a compound object of these two shapes, they:
a) both get the same 'half_extent' dimentions (i.e. they both say <half_extents>0.40000 0.40000 0.40000</half_extents> when the size of the boxes hasn't changed)
b) there doesn't seem to be anything in the XML that describes the parent/child relationship between the 2 boxes.

Code: 

<library_physics_models>        <physics_model id="Scene-PhysicsModel" name="Scene-PhysicsModel">            <rigid_body name="Plane-RigidBody" sid="Plane-RigidBody">                <technique_common>                    <dynamic>false</dynamic>                    <mass>0</mass>                    <instance_physics_material url="#Plane-PhysicsMaterial"/>                    <shape>                        <instance_geometry url="#Plane_001"/>                    </shape>                </technique_common>            </rigid_body>            <rigid_body name="Cube_001-RigidBody" sid="Cube_001-RigidBody">                <technique_common>                    <dynamic>true</dynamic>                    <mass>1.0</mass>                    <instance_physics_material url="#Cube_001-PhysicsMaterial"/>                    <shape>                        <box>                            <half_extents>0.40000 0.40000 0.40000</half_extents>                        </box>                    </shape>                </technique_common>            </rigid_body>            <rigid_body name="Cube-RigidBody" sid="Cube-RigidBody">                <technique_common>                    <dynamic>true</dynamic>                    <mass>1.0</mass>                    <instance_physics_material url="#Cube-PhysicsMaterial"/>                    <shape>                        <box>                            <half_extents>0.40000 0.40000 0.40000</half_extents>                        </box>                    </shape>                </technique_common>            </rigid_body>        </physics_model>    </library_physics_models>    <library_physics_scenes>        <physics_scene id="Scene-Physics" name="Scene-Physics">            <instance_physics_model url="#Scene-PhysicsModel">                <instance_rigid_body body="Plane-RigidBody" target="#Plane"/>                <instance_rigid_body body="Cube_001-RigidBody" target="#Cube_001"/>                <instance_rigid_body body="Cube-RigidBody" target="#Cube"/>            </instance_physics_model>        </physics_scene>    </library_physics_scenes>
The settings should be right because it behaves correctly when using the blender game engine.

Any ideas?

Statistics: Posted by gennoevus — Thu Dec 09, 2010 12:11 am

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