Light Reflect on Mtl_wrapper surface?

[dmarques1177]

I am trying to achieve a back glow effect to some 3d text, the way I see this glow is by placing a background surface behind the text so light can reflect/spread on the surface along with casting shadows. When I use the mtl_wrapper on the Background surface I can extract the shadows just fine, but the light glow is reduced and dimmed significantly. I am wondering how to achieve this glow without having the background being rendered in the scene so it could be later added in the final compostion.

Here is the comparison:






same render for the letters, one with the background texture rendered in scene, the other with a mtl_wrapper applied and placed on a different background.

[vlado]

The wrapper material compares the strength of the GI that falls on it with the scene GI environment background, so one way to boost the GI would be to reduce the GI environment intensity. Another option would be to boost the "GI receive" mutliplier in the wrapper.

Best regards,
Vlado