Blender exporter, enhancements and bugs

[MarkusTieche]

I recently played a lot with the current r71 Blender exporter, there are a few things I stumbled across.

• Exporting buffer geometry dosent't compile a correct json file, it misses a "data" attribute. Which later in the loading process cause an error.
  
• If you are in Blender and in edit mode while exporting, the script throws an error -> Can't apply the Triangulate modifier in edit mode. The exporter has to make sure that Blender is in Object mode, if not switch to Object mode.
• I can not export a scene which contains animations, the scene will be exported except for the animations. It doesn't matter if it's a bone or keyframe animation.
  Might be cool to export a scene with animation data.
  It seems there are a lot of things which not work correctly with the scene exporter, like vertex colors or multi material objects.
• there is a shadeless material button in the Blender material panel, would be nice if it exports that material value as well
• export Flat and Smooth shading type as well

I ❤️ three JS, great work

[repsac]

Exporting buffer geometry dosent't compile a correct json file

This is with geometry exports only and had been working so it seems a recent commit broke this.

[repsac]

Buffer geometry fix will be included when this branch is merged
https://github.com/repsac/three.js/tree/uv_optimization

Awaiting some potential feedback on this thread #6556

[Mugen87]

The JSON Blender exporter has been removed with R93 (#14117).

Also see: https://threejs.org/docs/#manual/introduction/Loading-3D-models