If you're looking at the voxel preview, you will notice that the RGB is correctly set up at the start of the simulation but once the smoke reaches it, it gets diluted and disappears. The reason is the Mapper settings. By default, the Initializer option is enabled. This means that the Mapper will set the specified channel (RGB in our case) to whatever value is provided by the Map on the first frame of the simulation and then it will become inactive. Disable the Initializer option, so the Mapper would affect the entire duration of the simulation. Lastly, the Time Constant parameter at the bottom controls how quickly the Mapper will set the affected cells of the simulator to the specified Map value. Time Constant is in seconds - the default value of 1 means that the Mapper will gradually set the RGB channel for the affected voxels over 1 second. Set Time Constant to 0 so the effect is instantaneous. If you want the colors to mix on contact instead of being outright overwritten, setting this to 0.1 or so should be a good starting point. That is all. You can hit Start to run the simulation. |