I have some colors corresponding to points. How to render point clouds and set colors for each point

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Hello, I checked the source code and searched for vtkColorTransferFunction. I found that the usage is to add colors on the vtkColorTransferFunction instance through the addRGBPoint method, and then through actor.getProperty().setRGBTransferFunction(lookupTable) to set the color.

But how to get the colors required by vtkDataArray in my requirement.