Render Channels Used in 3D Post Filters

When you render a scene from 3ds max, make sure you include the channels required by the 3D Post filters that you plan to use in combustion.

For example, if you plan to use the RPF Motion Blur filter, you must include the velocity channel in the rendered RPF file.

If you enable all the channels in the RPF Image File Format dialog, you can use any of the filters available in combustion. But keep in mind that the more channels you render, the larger the rendered file. See Creating RPF and RLA Files.

The following table illustrates which channels are used by each 3D Post filter.

Channel	3D Depth of Field	3D Fog	3D Glow	3D Lens Flare	RPF Motion Blur	G-Buffer Extract	Texture Map
Z Depth	Yes	Yes	No	Yes	Yes	No	No
Material Effects	No	No	Yes	No	No	Yes	Yes
Object	No	No	Yes	No	No	Yes	Yes
UV Coordinates	No	No	No	No	No	No	Yes
Normal	No	No	No	No	No	No	Yes
Non-clamped Color	Yes	Yes	Yes	No	No	No	No
Coverage	Yes	Yes	Yes	Yes	Yes	No	No
Node Render ID	No	No	Yes	No	Yes	Yes	Yes
Color	Yes	Yes	Yes	No	No	Yes	No
Transparency	Yes	Yes	Yes	Yes	No	No	No
Velocity	No	No	No	No	Yes	No	No
Sub-pixel Weight	Yes	Yes	Yes	Yes	No	No	No

Most of the 3D Post effects that use the RPF channels Color, Transparency, and Sub-pixel weight do not require these channels to be present (they are not available for RLA files). If present, the channels are used to improve the quality of the effect. The exception is G-Buffer Extract, which does require the Color channel.