Nicolas Alvarez napsal(a):
> OK, to put it in few words. I need to simulate a laser. An object with 
> high ambient and radiosity looks like a good solution, but I *really* 
> want to avoid radiosity (hard to keep good quality on an animation, 
> issues with tiled rendering, etc). I guess it should be possible with 
> media; but note I'm a noob with media, so please explain slowly. The 
> laser doesn't have to be realistic at all. It's game graphics; 
> highly-exaggerated will do.
> 
> Something like...
> 
> http://img225.imageshack.us/img225/9459/laser1lf4.png
> http://img129.imageshack.us/img129/8214/laser2qu2.png
> 
> note the glowing :]
for the light_source use a cylinder light_source.
for the media:
- define a shape to contain the beam (it's faster and more accurate). A 
thin cylinder will do
--use transmit 1 for that object
--make it hollow
--set media to its interior:
--scattering media
---density around 1e-3 (i'm not sure here)
---no absorption or emmision
---the syntax is scattering{type,color [extinction e]}
----type can be quite any but type 1 will do (isotropic filtering)
----keep color White
----if you want to use a weaker light_source set a higher density to the 
media and add extinction 0 to the scattering block.
Also, remember to add a lens effect to the lase head :-)

EG: density of 1e-3, beam radius of 0.1 and light intensity (color) 1e+4 
should give you a fully saturated beam when viewed perpendicularly.

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