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Danny nous apporta ses lumieres ainsi en ce 2004/05/15 17:26... : <br>
<blockquote cite="midweb.40a68af75c9adbfeffb015460@news.povray.org"
type="cite">
<pre wrap="">I'm trying to create a cylindrical laser that's white in the center,
fades
to red, and then fades to nothing at the edges so that it has a fuzzy
boundary. I know I need to use media, but I don't know what any of the
media terms do, so could anybody tell me which of them could help me?
</pre>
</blockquote>
Use a cylindrical pattern for your media enclosed in a long containing
cylinder. Then, assign it a color_map, 1 for the center, 0 for the
edge. It could look like this:<br>
///////////////////////////////////////////////<br>
cylinder{0,1,<0,1000,0>,1 texture{pigment{rgbt 1}}//invisible
enclosing shape<br>
interior{<br>
media {emission rgb 1 //make it an emissive,
luminous media<br>
density{ cylindrical<br>
color_map{[0 rgb 0][0.5 rgb<1,0,0>][0.98
rgb 1][1 rgb 2]}<br>
// Nothing outside, fade to pure red at mid point then to white then
double bright white at the very center<br>
}<br>
}<br>
}<br>
hollow // VERY IMPORTENT, if not present, the media
will disapears<br>
rotate<anglex,angley,anglez>// to orient your "beam" any way
you like<br>
translate<x,y,z> // to place it exactly where you want it to
go.<br>
}<br>
///////////////////////////////////////////////<br>
By having one end of the shape at 0 make it easier to correctly orient
and place it, it rotate around that point.<br>
It should looks best using ratiosity, as it will effectively emit light.<br>
<img height="90" width="144" alt=""
src="cid:par### [at] qwerty gov"><br>
Alain<br>
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