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Search keywords: g-buffer, RLA, RPF, render effects

General

VRay supports multi-layered G-Buffer output required for writing .rla and .rpf files, as well as by many 3dsmax render effects. VRay will automatically generate the g-buffer channels requested by the image output and the render effects and there is no need to select these manually.

Supported G-Buffer channels

This is a list of supported G-Buffer channels in 3dsmax.

3dsmax channel name	Supported by VRay	Description
Z	yes	Depth buffer. Note that in difference from the scanline renderer, VRay stores in this channel the distance to the camera, and not to the camera plane.
Material Effects	yes	The material ID.
Object	yes	The object node id that is set through the Properties dialog of an object.
UV Coordinates	yes	The surface UV coordinates. Note that VRay will always output the UV coordinates for mapping channel 1.
Normal	yes	The surface normal relative to the camera.
Non-Clamped Color	yes	The real unclamped pixel color. Note that this channel stores the pixels before any color mapping is applied. Like with the scanline renderer, this channel does not store atmospheric effects.
Coverage	yes	The contribution of an object to the image pixel.
Node Render ID	yes	A unique ID assigned by the renderer to each node.
Color	yes	The material color for the object. Like with the scaneline renderer, this does not include any atmospheric effects.
Transparency	yes	The material transparency for the object. Like with the scanline renderer, this does not include atmospherics.
Velocity	yes	The surface velocity relative to the camera.
Sub-Pixel Weight	yes	The contribution of an object to the image pixel including transparencies.
Sub-Pixel Mask	no	A bit mask for the contribution of an object to a pixel. The Sub-Pixel Mask channel is meaningless when AA filters, depth of field and motion blur are taken into consideration, which is why VRay does not support it.

Notes

• VRay takes antialiasing filters into account when generating the g-buffer channels, in contrast with the default scanline renderer of 3dsmax. This may cause differences in the way some render effects work. If this is a problem, turn off the AA filter from the Image sampler rollout. Also, avoid using AA filters with negative components (Catmull-Rom, Mitchell-Netravali) when generating a g-buffer - 3dsmax cannot handle layers with negative coverage and VRay will ignore those when creating the 3dsmax g-buffer.
• Generating a correct multi-layer g-buffer requires extra memory. This is because the 3dsmax g-buffer supports only scanline-style writing. However, VRay renders in buckets and cannot provide the data in scanline order. That's why VRay stores all the g-buffer data while rendering, and then writes it at once into the final image.
• G-Buffer layers are now generated correctly in Distributed rendering mode. This means that render effects like image motion blur will now work in DR mode too.

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