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Passing headlight

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SSGGMM
Passing headlight
on Nov 17, 2007 at 3:57:34 pm

Hi,

My problem is more a creative one than it is a technical one. But I happen to know there's no shortage of people with ideas roaming these halls.

Car headlights projecting into a room at night, throwing uneven patterns on the walls and ceiling, splitting up and fading (I don't need the actual headlights, obviously - just the stuff they're throwing onto the walls.)

My first problem is that I'm not sure what this actually looks like. What I do know is that it DOES NOT look like simple windowpane shadows moving along the wall. It's more complicated than that. But I can't seem to find any reference for it anywhere. Artbeats has a bunch of great animation samples, but none seems to match the idea.

I'm hoping someone could take a crack at describing what such an effect should look like to begin with. I'm a bit stuck on this.

Many thanks - S.


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Steve Sayer
Re: Passing headlight
on Nov 17, 2007 at 6:42:26 pm

We have halls?

One thing to keep in mind is that real car headlights, unlike CG default spots, aren't perfectly even and homogenous. They have hotspots, rings, unevenness, and noise.

Look:

http://hidtech.com/images/rsx%20on%20wall.jpg
http://www.istargazer.ca/images/xenonbeam2.jpg
http://members.rennlist.com/pbanders/neolite_driving_lights.htm

Making sure that your lights are casting a realistic pattern, as well as interacting with several layers of shadow-casting objects, is a good start.

Another step is to pay lots of attention to the animation of the lights. The fact that they are attached to the same object, which moves in certain very specific way, has a pronounced effect on the final patterns we see on the walls. If you don't have the virtual car moving fairly realistically, the headlight effect won't be convincing at all.

-Steve


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SSGGMM
Re: Passing headlight
on Nov 18, 2007 at 3:24:54 pm

Thanks for the pictures. I've been so obsessed with figuring out how they look while moving that I never stopped to wonder how they look in stillness.

Perfect place to start.


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Mark Weiss
Re: Passing headlight
on Jan 8, 2008 at 11:26:06 pm

I would build a reflector and bulb and use caustics to render a real beam. Put a lens in front of it and then at the window make some translucent curtains to diffuse the light at the edges. That should cast a realistic effect.

Take care,

Mark & Mary Ann Weiss

Business sites at:
http://www.mwcomms.com
http://www.adventuresinanimemusic.com < NEW Streaming Archives!
-


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Mark Weiss
Re: Passing headlight
on Jan 8, 2008 at 11:26:08 pm

I would build a reflector and bulb and use caustics to render a real beam. Put a lens in front of it and then at the window make some translucent curtains to diffuse the light at the edges. That should cast a realistic effect.

Take care,

Mark & Mary Ann Weiss

Business sites at:
http://www.mwcomms.com
http://www.adventuresinanimemusic.com < NEW Streaming Archives!
-


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Mark Weiss
Re: Passing headlight
on Jan 8, 2008 at 11:26:09 pm

I would build a reflector and bulb and use caustics to render a real beam. Put a lens in front of it and then at the window make some translucent curtains to diffuse the light at the edges. That should cast a realistic effect.

Take care,

Mark & Mary Ann Weiss

Business sites at:
http://www.mwcomms.com
http://www.adventuresinanimemusic.com < NEW Streaming Archives!
-


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