nomail@nomail wrote:
> Hi,
> 
> I've been trying to display isosurface(s) from 3D data from a user specified
> input file but with little success so far.
> 
> I've found the following solution:
> 
> #declare FUN = function {"data_3D_3",
>      < LEVSCALE>, library "i_dat3d","input.dat",<NX+1,NY+1,NZ+1,0>}

Whoever told you this syntax was mistaken.  See the POV-Ray manual 
(under 'user defined functions' and 'density files') for the correct 
version.

Christoph

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