Chris

I had been using a sky_sphere for the backdrop..... It only occurred to me
that using the inside of a regular sphere could act as a backdrop as well as
limiting the visible scene elements and unwanted height_field. Unfortunately
I did not gain much in display time.

Bounded_By and Clipped_By both looked like good solutions but they appear to
be devised for individual elements rather than for the scene in general. Is
there a way to apply either of them to the overall view?

Yes, some kind of test based on vlength sounds interesting.... I will give
that a try.

Don't know about a tree like structure... I feel that might be more useful
with a pre-defined path; my journey needs to be quite random.

David

Chris Huff <chr### [at] yahoocom> wrote in message
news:chrishuff_99-A7F704.15432915022000@news.povray.org...
> In article <38a9a1b2@news.povray.org>, "David Vincent-Jones"
> <geo### [at] galaxynetcom> wrote:
>
> > I am working on a project with a very large geographical span.
> > This entails a huge height_model and a thousand or more objects.
> ...

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