Lightmix - Block mesh light falls into Self Illumination channel

[Jonish]

Hello,
I have a block with emissive material + mesh light inside. I need to adjust emissive material color independently from mesh light color, however when I use lightmix, Mesh light channel is blank and self illumination channel contains both of them.

Exploding the block solves the problem, but it's just a workaround.

If you would need to see the model, I can send it to you via DM / email.

Cheers
Jonas

[Peter.Chaushev]

Hello,
Apologies for the extremely late reply!
Can you please check if the issue is reproducible with the latest update v5.20.06 from April 14th?
If it persists, please archive your scene using the Rhino menu V-Ray > Pack Project and share it with us for investigation via https://support.chaos.com/hc/en-us/requests/new
Make sure to leave a link to this forum thread in your message to ensure the report will be swiftly redirected to me.

Kind regards,
Peter

[javierrentas]

I have the same issue with the latest Updated V5.20.06 from April 14th.

[javierrentas]

Ok, I think I know how to reproduce the issue. The main block seems to be ok, but when you copy the block, then the Mesh light of those copy are acting as self-illumination materials in the light mix.

[Peter.Chaushev]

Thank you for the additional details!
Indeed when multiple instances of a block containing Mesh Light(s) exist, only one instance falls under the LightMix list entry with the light's name while the rest are sorted under the general /Self Illumination entry.
The issue is not reproducible with Mesh Lights residing outside blocks (so this is a possible workaround).

The V-Ray for Rhino dev team will schedule an investigation into this regression.

Kind regards,
Peter