"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

Hey, this is a great example! I have been trying to do this with Pov-Ray for a
while. I tried a direct copy and paste of this code into Pov-Ray but got (on
line "object {gauss"

---
Parse Error: Expected 'object', undeclared identifier 'gauss' found instead
---

I did a quick search for gauss and it doesn't seem to be an internal function.
Was this just a helper file or was there more to this example that I am missing?
I am relatively inexperienced...

Thanks in advance!!!!

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