[vtkusers] Brdf Implementation in Vtk

[dora csillag]

Hi all, 

I'm currently using VTK Visualisation Toolkit on a Microsoft VS 2010 platform, in order to load and edit some 3D models.
I'd like to create a realistic scene with lights, colors and material properties and I need to implement a Ward Brdf Model for the illumination.
When we create actors, we can set values for some properties like Specularity, Specularity Power, Diffuse, Ambient, etc... so I suppose there is a default implemented BRDF like Phong's one in VTK ?? 
Where can I find this illumination funciton ? How can I change this model to use mine ? Do I need to write and attach a Shader, or can I do it in the CPU ? 

Thanks in advance for any piece of advice,

Dora  		 	   		  
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