Control of reflection, lighting and background using HDRI's.

[DanSHP]

Hello all.

I've been trying to set up a lighting system that allows me to control all 3 in a scene independently.
I essentially want to use one HDRI to control my lighting and shadows, a second HDRI to control the reflections/specular and a third HDRI to control the background.

My idea is this.

- Three instances of the same vrayHDRI.
- Two of these vrayHDRIs are instanced spherically into two vraydomelights. One vraydomelight affects Diffuse only, the second vraydomelight affect specular and reflections only.
- The remaining of the three vrayHDRIs is instanced into the background slot (environment and effects).

This works in principle but I have noticed the third HDRI in the background slot, is casting light into my scene when the other two HDRI's (diffuse, specular, reflections) are turned off. I of course dont want to multiply the light being cast into my scene if I want to control each of these elements separately.

How do I get around this? It's important I keep the background in a vrayHDRI and set to speherical so i get a nice sperical warp to my background.

Cheers

[DanSHP]

anyone any ideas?

[svetlozar.draganov]

The correct result is actually with the third HDRI in the environment slot, the other two results with separate DomeLights for diffuse and reflection+specular are wrong.
The culprit is the GI which is incorrectly calculated when using multiple dome lights, this might be a bug but might be also a limitation of using multiple dome lights.
I'll make a note about it into our system and I'll keep you posted for any updates.