This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:
VrayVFBVRayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.
Deep output – Specifies whether to include this render element in deep images.
Auto update name – Automatically names the render element with the texture name.
Texture – The texture to apply to the scene. Click to select the texture, or drag it from the Material Editor to this slot.
Background color – The specified color is used for background in the VRayExtraTex render channel.
Consider for antialiasing – When enabled, antialiasing is considered where possible.
Affect matte objects – Sets whether to include matte objects when generating the render element. A matte object is an object that has been assigned a Wrapper Material with the Matte surface option enabled.
Force 32 bit output – When enabled, stores the Extra Texture render element as a 32-bit float even when writing a 16-bit raw image. This option applies only to multichannel .exr files.
Force lossless compression – When enabled, lossy DWAA/DWAB compression is not applied to the VRayExtraTex data stored in a multichannel exr.
Exclude – Opens up a dialog where objects can be included or excluded from receiving the texture.
