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Per pixel multiple lights

Started by b3rs3rk Jul 10, 2004 at 5:53 PM 2 replies 1k views

Original Post

Jul 10, 2004 at 5:53 PM

i know i have to render the scene for each light. ok, that's what i do.. but on the screen i have only one light, only the last i render :/ (i mean, if i have 2 lights,named A and B, if i render the map in this order Draw(light[A]); Draw(light); on the screen i've only the B light) there should be something i dunno... probably with texture combiners :/

Corrail

Jul 10, 2004 at 7:16 PM

You could use Blending functions for this:

Draw(light[A]);
glBlendFunc(GL_ONE, GL_ONE);
Draw(light);

vincoof

Jul 10, 2004 at 9:16 PM

Technically, there are only two ways of achieving multiple lights contributions :
1- add all light contributions in the pixel shader, granted that you don't exceed the pixel shader instruction limit,
2- render the object in multipass, granted that you can setup blending stages accordingly (eg there is a lot of problem in multipassing translucent objects).

b3rs3rk

Jul 11, 2004 at 1:33 AM

thank you :)

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