Le 15-06-18 21:26, Jörg 'Yadgar' Bleimann a écrit :
> Hi(gh)!

>
> O.k., this would avoid the memory-consuming generation of ASCII script
> code - of course at the expense of rendering time. But I never found out
> how to constrain such a function to a certain surface area defined by
> geographic coordinates rather than just producing a whole "sphere"...
>
> The more sophisticated approach would be hacking the very source code of
> POV-Ray, adding an object type "Geo_Mesh", which internally would be
> treated just like a heightfield - you would specify an image map (or
> even ASCII matrix file) containing the elevation data, then geographic
> coordinates for opposite corners, finally the "base radius" of the
> sphere to which the elevation values would be added.
>
> Does such a patch for POV-Ray already exist - or would I be the first to
> write it?
>
> See you in Khyberspace!
>
> Yadgar

I'd use a box to contain only the part to be used, dimentiones as small 
as possible. If the container is a sphere, then, it should be default to 
just a sphere outside the area of interest.
The max_gradient should be relatively low, in the 2.2 range, with a 
simple function. This should render reasonably fast. Using evaluate 
could make things go slightly faster.

As for the patch, I don't think it exist.




Alain

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