EXT_lights_area

[MiiBond]

This is almost identical to the previously-proposed KHR area lights extension except that it excludes "sphere" as a valid shape in favour of only flat lights. (See #1948).

[lexaknyazev]

For consistency, it might be better to follow the punctual lights schema with shape-specific properties located in nested objects.

Alternatively:

• There might be a common property, e.g., size. The rectangular shape may then have a rect.aspectRatio property while the disk shape wouldn't need anything else.
• All these properties could be assumed as always being 1.0 and the actual size would always be controlled by node transforms.

[MiiBond]

Great call. I'll make that change.

[bghgary]

Small comments. Do we need to discuss whether this extension should be EXT or KHR?

[bghgary]

Would it help to add a couple of pictures with an example of a rect and a disk in the real world for illustration purposes?

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