Channel Mapper
The Channel Mapper node can be used to map the RGB channels of an input texture to a new RGB channel order. The same input channel can be mapped to multiple output channels. In figure 1, the Channel Mapper node is used to map red, blue, and green from an incoming texture map into the same (0) channel for the plane on the right.
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Channel Mapper
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Figure 1: The Channel Mapper node is used to remap all three RBG channels