Deep
Rasters
When rendering
an image using Mantra, you can add extra channels that create Deep
rasters. The Houdini .pic format supports these extra channels which
can be used to store channels for variables such as Surface Position
or Surface Normals. These channels can later be used to achieve
compositing effects.
Setting
up a Deep Raster Rendering
Set up a Render
Output Operator for rendering out a sequence
of images. Click on the Deep
Raster tab and from the VEX
Variable arrow [>] choose a new channel type.
Here are a few of your options:
Surface
Depth [Pz] - This provides the zdepth information as
measured from the camera. This can be used for zdepth compositing
or adding effects such as depth of field or fog.
Surface
Normal [N] - This provides information about the surface
normals. This can be used to relight a scene in compositing.
Surface
Position [P] - This contains information about the
xyz positions of points in space. This can also be used for relighting.
Once you have
these set then rendering an image will produce extra channels that
can be used by the compositor.
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