HDRI Maps - Issues in lighting

[gputhige]

Hi

 

My current render settings for an exterior scene are as follows:

 

Building Exterior scene.

Vray rendering engine - Vray Camera

Direct Light to light up the scene - HDRI map used to light up the overall scene (diffuse lighting)

No other lights.

Planes used for Sky /Building / Tree maps - only for reflection on the external glasses (Cast/Receive Shadow off; Visible to cam off;)

 

My problem is

 

If I allow these maps used for reflection, to participate in the GI, then I have the colours bleed on the white external walls

If I reduce the vray properties Generate / Receive GI from 1 to say 0.1, then I have sploches on the white wall.

 

How can I use these planes for only reflection purposes but at the same time have the HDRI light up the walls?

I also noticed that if I use a sphere (half) for sky, then HDRI map does not light up the scene at all.

 

The HDRI map is in the vray overide environ slot as an instance.

 

Rgds,

 

GP