Cycles: Transparent hair curves render slow with volumes #119791
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Reference: blender/blender#119791
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System Information
Operating system: Linux-6.7.9-gentoo-x86_64-AMD_Ryzen_Threadripper_3970X_32-Core_Processor-with-glibc2.38 64 Bits, X11 UI
Graphics card: Quadro RTX 8000/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 550.54.14
Blender Version
Broken: Current Main
Worked: -
Short description of error
Transparent hair curves slow down rendering when placed in a scene with volumes. (The curves do not even have to be visible.)
Sergey asked me to submit this as a bug report so it can be looked into later. We are puzzled as to why it renders so slow.
Exact steps for others to reproduce the error
Open the attached file and render. The render should be really slow unless:
I can confirm using the attached .blend file.
In the Render Preview view, if you hide and unhide the hair curves, the performance returns to apparent normality.
@Sergey ^