You can set selection color using Communicator.SelectionManager.setNodeSelectionColor and setNodeSelectionOutlineColor. These API set only one color. If you want to use multiple colors on selection , you can achieve it by usingCommunicator.Model.setNodesLineColor and setNodesColors to set colors to selected nodes instead of selection color, then when there is no selection, reset the color using resetNodesColor.
https://docs.techsoft3d.com/communicator/latest/api_ref/viewing/classes/Communicator.Model.html
"Materials" of Developer Examples is helpful to see how to change the color of selected nodes.
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Learn how to highlight nodes with multiple colors, as shown in the example below in our forum post.
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