[vtkusers] fill vtkImageData in 3D

[Rachel]

Hi Kwayeke,

this is color image. To change the color R, G ,B try with this inside the
loop 

Image->SetScalarComponentFromDouble(x,y,z,0, R);
Image->SetScalarComponentFromDouble(x,y,z,1, G);
Image->SetScalarComponentFromDouble(x,y,z,2, B);

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