Support for glTF extension KHR_lights_punctual

[godiagonal]

Description

KHR_lights_punctual is a glTF 2.0 extension supported by most major WebGL libraries. We propose that the PlayCanvas built-in glTF parser should support this as it is the current de-facto standard for storing light source information in glTF.
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Step to reproduce

1. Open project https://playcanvas.com/project/684177/overview/khr_lights_punctual-test
2. Open scene “PointLightTest” and launch it
3. Open scene “SpotLightTest” and launch it
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What I expect to see and what I saw instead

Note that the mocked lights for the “Expected” results are an approximation and might not match exactly what a proper implementation would yield.

Point lights:

Spot lights:

[willeastcott]

Blocked on #2063.

[cx20]

I too am waiting for KHR_lights_punctual to be supported. It would be great to have support for the extensions listed below.

https://github.com/cx20/gltf-test#extension-test-models

Test model:
https://github.com/cx20/gltf-test/tree/master/tutorialModels/Lights

[cx20]

I have confirmed that this extension is available in the latest version of PlayCanvas and updated the status of gltf-test.

PlayCnavas v1.44.0-dev + Light.gltf result:

[willeastcott]

Thanks for confirming that this test now passes, @cx20. You're the best! 🙏