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Arealight spread and parametric coordinates can't play with each other
Closed, ResolvedPublic

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: hash 074b0b6da0a4
Worked: None

Short description of error
The parametric coordinates of arealights are apparently incompatible with the new spread feature (the actual mapping breaks down until just a solid color remains). This means custom arealight shapes are not possible for starters.

Exact steps for others to reproduce the error
Go to the rendered view, lower the spread parameter from 180 degrees to 0 degrees. Observe the texture.

.blend