Hello,

I'm playing with particles and I'm trying to make them glow and irradiate a surface (wall). I've tested different types of shaders but no success… Maybe thats not the way of doing it… Can you please tell me how to do that?

Thanks in advance!

If the number of particles is fairly small you might be able to just instance lights on to each of their positions using the Shader SOP.

If there are tons of particles you could render out a pass with just the particles and use that image as a projector on a single light or two.

I was going to point you to a nice little video tutorial that SESI created that shows how to do this but it appears sidefx.vislab.usyd.edu.au is down right now. (forever?) And I can't seem to find them anywhere else.

:?

addic3d
Hello,

I'm playing with particles and I'm trying to make them glow and irradiate a surface (wall). I've tested different types of shaders but no success… Maybe thats not the way of doing it… Can you please tell me how to do that?

Thanks in advance!

Hi, on odforce, I posted some point cloud stuff:

http://odforce.net/forum/index.php?showtopic=2135 [odforce.net]

In this is a pcplastic shader which takes a point cloud and uses each point as a light source. It's more an educational tool than a production example, but hopefully you might be able to use this.

Some other links that were recently posted on odforce on point clouds:
http://www.sidefx.com/exchange/info.php?fileid=208&versionid=208 [sidefx.com]
http://www.sidefx.com/exchange/info.php?fileid=209&versionid=209 [sidefx.com]

mark
Hi, on odforce, I posted some point cloud stuff:

http://odforce.net/forum/index.php?showtopic=2135 [odforce.net]

In this is a pcplastic shader which takes a point cloud and uses each point as a light source. It's more an educational tool than a production example, but hopefully you might be able to use this.

I'd just like to testify to the speed of this technique; we recently had a scene in production in which we used this point-cloud trick to instance 81,000 lights and it rendered in mere minutes. Using “real” lights would take hours.

Use the pcplastic route!

Thanks for your replys! I tryed light instancing and is ok, but I think I'll use the second method, the point cloud thing!

Thanks again!