Blender Git Loki

Keep axes defaults same as python importer.

Remove duplicate MTLMaterial, tex_map_XX. clean-up headers.

Make deps: Enable fPIC for Linux

Similar to D8823.

transform subdface into sockets

Mesh: remove unused function, wrong assert, {} etc.

Material: add emission strength's effect on Ke (color)

Ref {rBAec4ad081e564}

Material: add comments, use explicit float3 initialisation.

Implement ID properties support for TimeMarker

Allows scripters to store additional information in the marker itself instead
of using work-around approach based on marker names and such.

Differential Revision: https://developer.blender.org/D8944

Fix T79965: mesh.transform() modifies referenced layers

Originally was noticed when transforming mesh created by
object.to_mesh() from an object without modifier, in which case the
result references CustomData layers used by the object itself.

The issue goes a bit deeper: mesh.transform() should never modify
referenced layers, hence it should duplicate referenced layers.

This fix changes one specific aspect of the reported behavior. The
case where vertices coordinates are modified manually will still have
affect on the source mesh (as no referenced CustomData layers are being
duplicated). Proper fix for this case is not yet clear to me.

Differential Revision: https://developer.blender.org/D8939

Material: style guide, Class rearrangement.

Writer: add object group writer member function

Nurbs: remove depsgraph from class, minor cleanup.

Replace uint and short with int and int16_t

Cleanup: exporter main: use const, style guide.

Cleanup: use const, edit comments, reorder includes.

No functional change.

Change axes transform defaults to match old behavior.

Write empty usemtl if a polygon has no material.

Merge branch 'master' into soc-2020-io-performance

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-edit-curve