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Hi,
I'm searching a way to entirely replace the background of a rendered image in post-production only. (I'm using VRay + Max). Thanks in advance for any advices.
THE CONTEXT AND WISHES :
1. Most of my scenes have a ground surface that receive shadows. I usually set the material of the ground surface has a matte surface (VRayMtlWrapper, base material : vraymtl (grey), matte surface: checked, shadow: checked, alpha contribution : -1). These settings gives me the exact alpha of all objects except the ground by adding VRayAlpha in the render elements.
2. The new background to add in compositing is a real picture.
3. I would like to do the "rendering" part in only one shot.
THE COMPOSITING WOULD BE (I GUESS) :
Render x VRayAlpha
OVER (the result above would have no addition - just over as a separated layer)
RawLighting x Background
ADD (+)
RawGI x Background
THE PROBLEMATIC :
If the suggested compositing is right, I found no way to get the GI on a matte surface. The result of the VRayRawGlobalIllumination on a matte surface is always black.
I'm searching a way to entirely replace the background of a rendered image in post-production only. (I'm using VRay + Max). Thanks in advance for any advices.
THE CONTEXT AND WISHES :
1. Most of my scenes have a ground surface that receive shadows. I usually set the material of the ground surface has a matte surface (VRayMtlWrapper, base material : vraymtl (grey), matte surface: checked, shadow: checked, alpha contribution : -1). These settings gives me the exact alpha of all objects except the ground by adding VRayAlpha in the render elements.
2. The new background to add in compositing is a real picture.
3. I would like to do the "rendering" part in only one shot.
THE COMPOSITING WOULD BE (I GUESS) :
Render x VRayAlpha
OVER (the result above would have no addition - just over as a separated layer)
RawLighting x Background
ADD (+)
RawGI x Background
THE PROBLEMATIC :
If the suggested compositing is right, I found no way to get the GI on a matte surface. The result of the VRayRawGlobalIllumination on a matte surface is always black.
