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  Creating a light attenuation effect  (Read 840 times)
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Offline ribot

Junior Member




Ribot - mobile UI specialist


« Posted 2004-06-11 23:32:14 »

Hi all,

I'm just wondering what would be the best solution to recreating an effect like the image below



I will only need to light the floor and no other objects in the scene, so maybe I don't even need to use the OpenGL light state machine?

I've been thinking that a possible solution may be to split the floor into a large number of quads,  and calculate their distance from the light source given the standard equation.  Is this just extra work and should I just let OpenGL calculate it for me by using a spot light type function?

http://ribot.co.uk - design agency focused on mobile
http://www.retrospecs.co.uk - online vintage eyewear store
Offline cfmdobbie

Senior Member


Medals: 1


Who, me?


« Reply #1 - Posted 2004-06-12 19:51:06 »

OpenGL lighting is not what you want - it's not generally optimized and would require a very high poly count to get that kind of effect.

You probably want to look at lightmaps - basically where you project a spotlight texture onto your surface.  First hit on Google looks good:

http://www.3ddrome.com/articles/dynamiclightmaps.php

Hellomynameis Charlie Dobbie.
Offline ribot

Junior Member




Ribot - mobile UI specialist


« Reply #2 - Posted 2004-06-12 23:32:12 »

Thanks cfmdobbie,

that looks exactly like what I was after!  I'd never heard of lightmaps, so I didn't know what to google.  Smiley

I'll post back when I have implemented an answer.

http://ribot.co.uk - design agency focused on mobile
http://www.retrospecs.co.uk - online vintage eyewear store
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