Jaime Vives Piqueres schrieb:


> 
>> Does anyone here know about such POV macros/external programs to do 
>> this job?
> 
> 
> Here are my experiments on that matter:
> 
> http://www.ignorancia.org/en/index.php?page=Heightfield_based_Isosurf
aces

Looks nice - note you could spare the separate preprocessing steps by 
using the function image type (combined with the gradient calculation 
functions for the slope map)

Concerning the original question:  Use of the bicubic interpolation from 

MegaPOV generally improves the appearance of image based isosurfaces up 
to the point where you at least don't see the grid structure any more. 
And concerning the interpolation of height contours into a regular grid 
- i found that most methods available for this purpose fail miserably 
when dealing with useful grid sizes (i.e. 3000 pixels squared or more). 
  A technique i found to work quite well can be found on: 
http://www.imagico.de/pov/earth_interpolate.html

-- Christoph

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