Example stereo pano

Scene.copy(): recursive support

https://twitter.com/alteredq/status/697103627773734914

Fix bug of SoftwareRender sprite and optimize it

Adds blender exporter option to toggle compact separators output

export textures from blender with correct clip/repeat mode

blender exporter breaks when parent contains keyframe animation and child does not

Blender exporter: Added second UV layer support

This should fix issue 8054

Adding line breaks to FaceNormalsHelper docs

Adding line breaks to FaceNormalsHelper docs for readability and consistency with other docs.