"cvanvlack" <nomail@nomail> wrote:
> "ltong" <nomail@nomail> wrote:
> > ok, after some experimentation, the result looks much better. seems value_n is
> > defined as 1-min(1,Fn). Don't know how to attach a pic here, below follows the
> > code.
> >
> >    #declare FALLOFF  = 1.3; // just an example, toy with it
> >    #declare a = 0.7;
> >    #declare b = 0;
> >    #declare c = 0.44;
> >    #declare FnRadial = function(r) {a*exp(-(r-b)*(r-b)/2/c/c)}
> >    #declare FnAxial  = function(z) {1/(1+(FALLOFF*z*FALLOFF*z))}
> >
> >    // helper function to compute radius from x,y
> >    #declare FnR = function(x,y) { sqrt(x*x+y*y) }
> >
> >    // the resulting 3D function
> >    #declare Fn = function(x,y,z) { FnRadial(FnR(x,y)) * FnAxial(z) }
> >
> > object {gauss
> >   hollow
> >   pigment { color rgbt<1, 1, 1, 1> }
> >   interior {
> >     media {
> >       emission color rgb < 1.0, 0.0, 0.0>
> >       density{ function {Fn(x,z,y)}
> >                color_map {
> >                   [0 color rgb <0.0, 0.0, 0.0>]
> >                   [1.0 color rgb <1.0, 0.0, 0.0>*1.2]
> >                          }
> >              } // end density
> >      }//end of media
> >     } //end interior
> >    scale <1,1,1>*1.5
> >    translate<0,2.0,0.0>
> > } //end object
>
>
> This is a really great example! I tried just a simple copy-paste into POV-Ray
> and I keep getting the error
>
> ----
> Parse Error: Expected 'object', undeclared identifier 'gauss' found instead
> ---
>  on the "object {gauss" line. I did a quick search to see if 'gauss' was an
> internal POV-Ray command but it appears that it isn't. Is this the full example?
> Are there additional dependencies missing? I'm a little new at POV-Ray so please
> excuse my inability to troubleshoot this for myself.
>
> Thanks for your time!

Sorry for the double post. Thank you for answering Alain, that worked perfectly.

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