clipka <ano### [at] anonymousorg> wrote:

> It's not possible to limit the light source to rays at /exactly/ 45
> degrees, as that would be an infinitesimally thin cone, and the
> raytracing algorithm wouldn't catch any of the light (except by mere
> coincidence).
>
> To limit the light to, say, between 40 to 50 degrees, you could create a
> spotlight with a 50 degree angle, and another spotlight with a 40 degree
> angle and /negative/ brightness.


Clever!  :)
I was thinking about using a point, or spotlight, and a CSG object - a box with
a conical cutout, and a smaller solid cone in front of it - forming a
cone-shaped void for the light pass through.

> However, using a point light and a torus as a `projected_through` object
> /should/ also work in principle.

Also very clever  :)

From:   http://www.povray.org/documentation/view/3.7.0/316/
"Any textures or interiors on the object will be stripped and the object will
not show up in the scene."

Is that an accurate description?
I have questioned in the past if texturing could be stripped from objects so
that a later texturing could be used (overriding the prior texture), as I
believe Kenneth has as well.

If `projected_through` indeed works by this retroactive mechanism, then could
there possibly be an `override_texture` directive in the future?

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