Does anyone have any tips, suggestions or pointers towards getting a
translucent effect in pov? (This is not to be confused with
transparency.)

Abe

Post a reply to this message

On Mon, 18 Jun 2001 18:01:26 -0400, Abe wrote:
>Does anyone have any tips, suggestions or pointers towards getting a
>translucent effect in pov? (This is not to be confused with
>transparency.)

You can cheat with some objects, such as bicubic patches, that allow
illumination from both sides.  I think MegaPOV lets you turn on that
functionality for any object with the double_illuminate keyword.

If that doesn't do what you want, your only alternative is a dense
scattering media.  The down side to that, of course, is that it might
be a bit slow.

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbf 1}hollow interior{media{emission 3-T}}}#end 
Z(-x-x.2x)camera{location z*-10rotate x*90normal{bumps.02scale.05}}

Post a reply to this message

Abe <bul### [at] taconicnet> wrote in message
news:3B2E7A36.BB174441@taconic.net...
> Does anyone have any tips, suggestions or pointers towards getting a
> translucent effect in pov? (This is not to be confused with
> transparency.)
>

I used the following pigment for frost on a window. It looked ok from a
distance.

pigment {
  bozo
  scale 0.0001
  color_map {
   [0.0 Clear]
   // [0.9 White]
   [1.0 White]
  }
 }

Gail
--
*************************************************************************
* gsh### [at] monotixcoza                *   Step into the abyss,           *
* http://www.rucus.ru.ac.za/~gail/   *   and let go.          Babylon 5 *
*************************************************************************
* The difficult we do immediately, the impossible takes a little longer *
*************************************************************************

Post a reply to this message

You could consider looking at PovMan by Vahur Krouverk:

http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2

it allows you to define your own shading models and procedural
pigments.(very versitile)

benp

Abe wrote:

> Does anyone have any tips, suggestions or pointers towards getting a
> translucent effect in pov? (This is not to be confused with
> transparency.)
>
> Abe

Post a reply to this message

Wasn't it Abe who wrote:
>Does anyone have any tips, suggestions or pointers towards getting a
>translucent effect in pov? (This is not to be confused with
>transparency.)

You might consider something like

     pigment {rgbt <1,1,1,0.7>}
     normal {bozo scale <1,1,10>*0.001}
     interior {ior 1.3}

This is intended to be viewed from along the z axis, so the normals are
scaled higher in the z direction than they are in the x and y
directions.

Depending on the exact effect you're after, you may want to tweak some
of those numbers. Increasing the ior increases the scattering. Changing
the pigment to {rgbt <1.5,1.5,1.5,0.7>} can look convincing in some
cases.

-- 
Mike Williams
Gentleman of Leisure

Post a reply to this message