Add support for AreaLights

[sebavan]

Based on those researches, integrate supports for Area Lights:

• https://eheitzresearch.wordpress.com/415-2/
• https://eheitzresearch.wordpress.com/757-2/

[undefinedlee]

Which version of this feature is expected to be implemented

[deltakosh]

We don't know yet. This is something we are looking for help if you are motivated

[Pryme8]

Is this still something we want? I was looking at the code it would not really be that hard to convert, but it does look like it only supports planes at this moment.

[deltakosh]

oh yes we want it. but we want it as a regular source (so for all meshes)

[Ivolutio]

Maybe PlayCanvas their implementation (light shapes) can also help. They have predefined shapes though.
Docs: https://developer.playcanvas.com/en/user-manual/graphics/lighting/lights/#light-shapes
Example: https://playcanvas.github.io/#/graphics/area-lights

[lokiiarora]

Do we want shadow support as well?

[Popov72]

I don't think so, soft shadows can be simulated to some extent with PCSS or some other filter method. Generating accurate shadows for area lights would be quite time consuming I think.

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