Hi Mike,

to allow articulated parts on instanced models you can use bone deformation 
instead of DOF transforms. This changes the way the tanks have to be modelled, 
but it allows you to render all tanks in one draw call. You can use 
osgAnimation or osgCal to do the bone deformation. 

Cheers,
Martin

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http://forum.openscenegraph.org/viewtopic.php?p=51757#51757





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