"Hughes, B." <omn### [at] charternet> wrote:
> "Richard Smith" <rms### [at] penet> wrote in message
> news:web.40bb5389f72d05f9a14125e90@news.povray.org...
> >
> > Your Blue Mars effort inspired me.  I had been wanting to create a
> spherical
> > height field for analyses that I was doing on Mars' surface features.  I
> > created an isosurface based on a Mars topo map as pigment.  The attached
> > image is the result so far (without the ocean sphere).  I can't seem to
> get
> > a complete map of the surface in spherical form.  Weird.  Is your map
> > complete?
>
> Seeing as you haven't gotten a reply here yet, looks like the median pigment
> value is at the threshold. Meaning, maybe you could change 'threshold' to
> something other than 0 (greater than) and get the rest to show up. Either
> that or a max_gradient being too low, but that usually doesn't appear so
> clean in my experiences.
>
> So if this was done by adding the function to a sphere the black parts are
> probably ending up less than zero and so below the container sphere's
> surface, if I'm thinking of all this correctly. I might be way off.
>
> To Timothy Cook:  Wow! That's a beautiful view from space!
>
> Bob H.

I'll check the things you mentioned.  I'm not entirely sure I am using
isosurface correctly.
Thanks for the suggestions.

Rick Smith

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