G-Buffer support

General

Supported G-Buffer channels

Notes

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

General

V-Ray supports multi-layered G-Buffer output required for writing .rla and .rpf files, as well as by many 3dsmax render effects. V-Ray 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 3ds Max.

3ds Max channel name Supported by V-Ray Description

Z yes Depth buffer. Note that in difference from the scanline renderer, V-Ray 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 V-Ray 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 V-Ray does not support it.

Notes

V-Ray takes antialiasing filters into account when generating the g-buffer channels, in contrast with the default scanline renderer of 3ds Max. 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 - 3ds Max cannot handle layers with negative coverage and V-Ray will ignore those when creating the 3ds Max g-buffer.
Generating a correct multi-layer g-buffer requires extra memory. This is because the 3ds Max g-buffer supports only scanline-style writing. However, V-Ray renders in buckets and cannot provide the data in scanline order. That's why V-Ray 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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3ds Max channel name	Supported by V-Ray	Description
Z	yes	Depth buffer. Note that in difference from the scanline renderer, V-Ray 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 V-Ray 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 V-Ray does not support it.