> What I'm trying to do is compute a lightmap projection for certain
> triangles in the scene.  The raytracer needs to consider the entire
> scene but not *render* the entire scene; just the sub-section.

   Do you know you can bake textures/lightmaps with the new mesh_camera?
As long as your subsection is a separate mesh, you can render only the
lightmap for that mesh, while taking into account the rest of the scene
(i.e. the scene will cast shadows/radiosity on your lightmap). Look up
the basic example on scenes/camera/mesh_camera/baking_demo.pov, it
should get you started...

   Regards,

-- 
Jaime Vives Piqueres
		
La Persistencia de la Ignorancia
http://www.ignorancia.org

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