Add an option to only export deform bones of an armature #8
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Not hooked up to anything yet.
Now when the option is enabled a bone is exported: - Only when marked "Deform" in Blender. - If any of its children are marked "Deform", even if the bone itself has "Deform" disabled. This works the same way as Blender's FBX's and Collada exporters. Animation data for other bones still gets exported and will be fixed.
When the corresponding exporter option is enabled of course.
- Put the common bone deform check function to osgutils - Write a nicer if trees without code duplication - add missing mathutils import to bake script
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A properly done rig in Blender contains many more bones than strictly those required to deform geometry. These extra bones allow for complex rigs that make animation easier but are not needed in the exported file.
This MR adds an option to filter bones (and their corresponding animation data) based on the bones' Deform flag. It's the same option available in fbx, gltf, and collada exporters.
When a bone with Deform enabled is present in the rig's hierarchy, its parents need to be exported as well. This ensures predictable exported animation result but requires users to set up their rigs properly with non-deform bones in their own branch of the rig's hierarchy. Again, its the same behaviour as with other exporters.
I tested this on OpenMW's Land racer and everything looks to perform as expected - only the deform bones and animation channels get included in the exported file. land_racer.osgt.zip
The option is exposed in the exporter's UI.
