[vtkusers] Overlay (R,G,B) over MIP in 3D

[Divya Rathore]

I am successfully able to render a 3D dataset
using vtkVolumeRayCastMIPFunction and vtkVolumeRayCastMapper.
Now, for certain sparse set of 3D coordinates within this dataset, I want to
overlay  specific RGB color values for them in the above Max Intensity
Projection.

Which would be the best VTK classes to do this?
Ideally, I would like to feed in the RGB values somewhat like this:

//pseudocode over an iterative loop
appropriateVtkCxx(x, y, z, R, G, B);

suggestions would be much appreciated!

best regards,
Divya
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