Ignore light normals bug

[TheLooopCGI]

I'd like to report a bug in V-Ray 2.40.04.

When a V-Ray light has "Ignore light normals" unchecked, the render elements after composing doesn't match the overall RGB color.

The way I do the composing in Photoshop:
GI
Lighting
Reflections
Refractions
Speculars

All 5 layers in Linear Dodge (Add) mode.

When the light uses default settings (Ignore light normals is checked) then the composing is fine and all matches.

I can provide a test scene but it's easily reproducible with just one grey box sitting on a plane and a v-ray light shining down on it.

[vlado]

We actually have to remove that option; it is not guaranteed to work properly as you found out.

Best regards,
Vlado

[TheLooopCGI]

I see.

What is actually the correct behaviour as expected in real life? When you have a softbox in a studio, there's a spot behind it shining on a transparent piece of white cloth so I would imagine that more light is emitted in the direction the light is pointing to. So if I'm correct removing that option makes the V-Ray light behave unrealistically?

Or why do you want to remove the feature instead of fixing it?

Thanks!

[vlado]

The correct behavior is the default settings where the option is enabled. You can use the "directionality" parameter, which works properly.

Best regards,
Vlado

[TheLooopCGI]

Oh, I was using my lights wrong! Haha, alright, thanks for explaining!