Irradiance Map & Use Local Subdivs

[olly]

I am setting up a flythrough for the first time since installing 3.3.04 and I'm noticing a few issues. I am using the new default of "use local subdivs" unchecked.

My normal approach uses IR & LC with all vraylights set to "store with irradiance map" and high subdiv values.

I notice that when I check "store with irradiance map" the subdiv spinner becomes available - so far, so good. However the subdiv value entered has no effect on the quality of the light stored in the irradiance map, it is always bright splotchy. I have only been able to improve the quality by checking "use local subdivs" so my high subdiv value is taken into account.

The below images are both using the "High-animation preset", 100 hsph subdivs and 80 subdivs for the vraylights. The only setting changed between the renders is "use local subdivs" is checked in the clean render.


"use local subdivs" is unchecked


"use local subdivs" is checked

Am I doing something wrong or is this a bug?

[vlado]

It might be a bug, but I'm not sure if you've changed any other settings. Can you post the scene?

Best regards,
Vlado

[olly]

Here's the stripped down scene: irradiance map & use local subdivs possible bug.zip

I think I've managed to find the cause, it seems to be a mesh light.

Let me know what you find out!

[olly]

Did you get anywhere with this Chaos?

[svetlozar.draganov]

Did you get anywhere with this Chaos?

This is a bug definitely, will make a note about it and it would be fixed.
As for now the only option to workaround it is to either use the old approach (Use Local Subdivs ON) or to disable Store With Irradiance Map option for the lights.

[olly]

Thanks for the update.

As for now the only option to workaround it is to either use the old approach (Use Local Subdivs ON) or to disable Store With Irradiance Map option for the lights.

..or use a vraylightmtl on the mesh....