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The Mapper uses textures to affect a channel in the simulation's grid. The chosen grid channel can either be directly set to the texture's values when the simulation starts, or it can gradually approach the texture's values over time. The Buildup Time specifies the time it takes for the channel to reach the full value specified in the texture under the influence of the Mapper.

The Mapper affects all Phoenix simulators in the scene unless they explicitly exclude it.

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title UI Path: ||Phoenix FD menu|| > Create > Mapper
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You can use the Mapper to affect any grid or particle channel.

The video to the right shows the Mapper affecting the Grid RGB Channel instead of the Smoke density grid channel, and a V-Ray User Color texture with a solid Green color set as the Map parameter for the Mapper.

Once the smoke passes through the volume of the sphere geometry, it inherits the RGB color set by the Mapper for that region of the Simulator.

For this setup to work, a Phoenix Source is created to emit Smoke and RGB (the color is set to Gray). On the Phoenix Simulator → Output rollout, RGB Grid Channel export is Enabled.