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Why there are black spots around the light sources after Photon Raytrace?

Answer:

The light source on the left is a thin 3D object converted from modeling. When it’s set as a
light source, it will generate black spots around its edges after Photon Render. On the other hand, the light source on the right is a surface (2D) of an object in VR, and it won’t give rise to the same problem.