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the spot light using light falloff node works differently between viewport render and final render !
Closed, InvalidPublic

Description

System Information
Operating system: window 10
Graphics card: 9700k, 2080s( the newest studio driver), 32GB

Blender Version
Broken: blender-2.83-79b391f3a009-windows64(also test in the 2.82a stable)
Worked: none

Short description of error
when using light fall off node to control the spot light in cycles (the node like below)


the ipr render in viewport is not the same of the final render by clicking f12(the first is the viewport render, the second is the finalrender )

I try it with the cpu/gpu cuda/optix render (support and ex feathers ),but get the same result:
they all show good in viewport rendering ,but not right in the final rendering !
the scene is not too big(use the alt d mesh,the mesh is about 2MB total)
work the same in a very simple scene(link below)



Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
simple blend file:

Event Timeline

yonghao lv (Atticuslv) changed the task status from Needs Triage to Needs Developer to Reproduce.Mar 28 2020, 12:19 PM
yonghao lv (Atticuslv) updated the task description. (Show Details)
Ankit (ankitm) changed the task status from Needs Developer to Reproduce to Needs Triage.Mar 28 2020, 3:04 PM
Evan Wilson (EAW) closed this task as Invalid.Mar 29 2020, 1:54 AM
Evan Wilson (EAW) claimed this task.

Thank you for the report @yonghao lv (Atticuslv). You have an area light that you have hidden in the viewport but not in the final render. Unfortunately, Disable in Renders is hidden by default. You can enable it by clicking on the Filter Icon. If you re-enable the area light in the viewport, you will see that the lighting in the viewport render preview matches the final render.

Thank you Evan Wilson (EAW) !
You help me a lot!
Best regard