vtkOBJImporter color mapping for k3d

Question

Following the code here, one can get granular vtkPolyData to pass to k3d in python. However I am currently assigning color to k3d like so;

def rgb2hex(r,g,b):
     return eval("0x{:02x}{:02x}{:02x}".format(r,g,b))

#using the actors from [referenced code][1] to get the granular actors from .OBJ
col = actor.GetProperty().GetDiffuseColor()
rgb2hex(int(col[0]*255),int(col[1]*255),int(col[2]*255))

This is ugly and inefficient. vtkPolyDataMapper should be already handling the color, so there must be a way of doing this in a more direct way. How can one use the vtkPolyDataMapper to get a list of colors to pipe to the k3d.vtk_poly_data() color argument?

mapper = actor.GetMapper() 
mapper.SetInputData(vtkPolyData)

Answer 1

VTK does not natively provide this formatting (0xrrggbb) for color. You always have to deal with 3-components floats or integers.