Gail Shaw <gsh### [at] monotixcoza> wrote:


> Geoff Wedig <wed### [at] darwinepbicwruedu> wrote in message
> news:3a9becc7@news.povray.org...

>> Maybe I'm missing something.  I did a search on the Pov docs and didn't
> find
>> any reference for pass_through.  I looked at the Megapov docs and only
> found
>> it for photons.  Can you do a pass through with normal light_sources?  If
>> so, I think I might have figured a way to make this image much easier, and
>> faster.

> From the megapov docs:

> 6.5. Projected through
> Author: Ronald L. Parker

> syntax:

> light_source {
>   ...
>   projected_through {object {...}}
> }
> The light rays that pass through the projected_through object will be the
> only light rays that contribute to the scene. Any objects between the light
> and the projected through object will not cast shadows for this light. Also
> any surface within the projected through object will not cast shadows. Any
> textures or interiors on the object will be stripped and the object will not
> show up in the scene. This is if the ambient value in the finish {} is set
> to 0.

Ah.  Thanks.  I was looking for pass_through, per Chris's post, which is
photons.  I wonder if this should be made consistent... Not entirely sure
they do the same thing, though.

Geoff

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