[vtkusers] Help -- Determine Shade and Lit Triangles

[Davood Ansari]

Hi all

I have a complex object represented as a triangular mesh.
I am going to do some kind of numerical analysis on the object surface.
*The assumption is that light is impinging onto the object surface from some
infinitely faraway point*. Is there an efficient
function which based on the location of the light source determines  *which
triangles are in light and which ones fall in the shade*?

Many many thanks
Davood
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