Hi,
I’m Chai, and I’m a Game Developer
and baking light-maps using Render To Texture.
And using 3ds Max 9’s default frame buffer,
I found that VRayRawLightingMap loses very bright colors.
And it looks like pixel-color was clamped to 0-255.
I tried to set target image format to ‘*.hdr’ or ‘*.exr’
But it had no effects.
*.hdr images were clamped one. (why? :-()
and *.exr images were completely black.
So my question is:
How Can I Get a HDR image of VRayRawLightingMaps & VRayRawGlobalIlluminationMaps ?
And… I tried using “V-Ray built-in Frame Buffer”. 
But it seems like that not-well-coupled with RTT dialog.
I could make only one vrimg file of the last baked object.
All objects were rendered on same frame buffer, and over-written.
Forunately that vrimg file was a valid multi-layered hdr image file that i wanted. (although for only one object.)
I may bake a light map per object serveral times. But there are hundreds of objects, and it takes too much time.
So my question is:
How Can I Get HDR images of VRayRawLightingMaps & VRayRawGlobalIlluminationMaps ?
Please help me.
PS. (I’m using 3ds max 9 & V-Ray Adv RC3)