I'm trying to implement a simple shader in POV-Ray by modifying the existing
source code.  The code is quite extensive, and knowing where to begin seems
a bit confusing.  Does anyone have any ideas on where I would specify a
method call to a shader to determine the colour of a particular ray
intersecting an object?  Does anyone know if a method has been created to
determine the incident angle of a ray on an object, and if so, under which
class is it?

Thanks,

MM

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