View Full Version : Laser scan meeting surface effect!

sean hargreaves
06-09-2007, 10:56 AM
Does anyone know how to get the effect of a laser scanning a surface? I am trying to get the same look like in the film Aliens at the beginning where the blue laser scans the interior of the ship. Where the laser actually hit the surfaces there was a somewhat thicker and brighter line. This seems impossible to get in 3d because a polygon has no thickness! Help!

06-09-2007, 02:49 PM
You probably want to do it with an animated image map on the surface the beam's hitting. I haven't seen the movie recently so I can't offer any more advice than that.

If you post a screen cap of what you're trying to do people will able to offer you more helpful advice.

06-09-2007, 05:15 PM
make a very long shadow tube with an extremely small diameter and open on one end.

set up the properties so it doesn't cast shadows or is seen by camera.

place a light just inside the closed end, give it a volemetric texture referenced to an external null.

pitch the shadow tube up and down for the scan.

that's basically it. how well it'll work for you depends on your scene and objects.

sean hargreaves
06-09-2007, 07:21 PM
Wow, thats sounds great, I'll try it! Thanks!