Support SVG for reference images

[andybak]

Only thing lacking is export support but I'm not sure what the correct behaviour would be. GLTF supports SVG textures but Blender doesn't seem to allow it. Rasterize the SVGs on export? I think we can punt on this for the moment and document this as a known issue. SVGs are rasterized on export

[mikeskydev]

Cool!

GLTF supports SVG textures

Source? I've only found info that says it's not going to happen officially. KhronosGroup/glTF#549 (comment)

I think it would be fine if we rasterized on export.

[andybak]

Source? I've only found info that says it's not going to happen officially. KhronosGroup/glTF#549 (comment)

Ah - I misread that same page when I skim read it just now.

I think it would be fine if we rasterized on export.

I don't plan on working on that immediately however. Is it a blocker for this PR?

[mikeage]

looks fine, one observation

[andybak]

@mikeskydev :

I think it would be fine if we rasterized on export.

This is now implemented.

[aaronfranke]

Is there a desire from Open Brush to support SVG textures in GLTF? I am also mildly interested in having this in Godot Engine. It should be quite trivial to build a spec for this.

The only blocker is justification and motivation. I don't have any particular use case for this myself.

Also, for the name, Khronos discouraged me from using the EXT_ prefix because there are not multiple vendors interested. However, if both Open Brush and Godot are interested, that would be at least 2 vendors.