Analytical area lights - Linearly Transformed Cosines
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Contingencyy commented
https://learnopengl.com/Guest-Articles/2022/Area-Lights
https://eheitzresearch.wordpress.com/415-2/
https://drive.google.com/file/d/0BzvWIdpUpRx_d09ndGVjNVJzZjA/view?resourcekey=0-21tmiqk55JIZU8UoeJatXQ
- Implementation for Linearly Transformed Cosines to evaluate irradiance from area lights
- Rectangular area lights implemented
- Render area lights in world
- FIXED: Rotating area lights breaks the lighting (probably because of the 4 points being out of order)
- FIXED: Area light is not rendered from both sides (no back-face culling)
- LTC LUT textures should be calculated by my own code instead of using the precalculated ones
- Rectangular area lights can be textured
- Area lights properly interact with clear-coat layers