GLSL "Bloom Effect"

MidgarZolom · 2005-06-09T14:34:39

Hello. I am a veteran OpenGL programmer. However, I am still quite new with shaders. I was wondering if someone could help me figure out how to do something like this: http://www.facewound.com/img/how-the-bumping-works/3-bump-example_finalresult.jpg Here is what I know: Scene is renderered and put into a texture: (http://www.facewound.com/img/how-the-bumping-works/1-bump-example_noshaders.jpg) A normal map is rendered is rendered and put into a texture: (http://www.facewound.com/img/how-the-bumping-works/2-bump-example_normalmap.jpg) Shader takes the two textures and does something. What that thing is, I do not know. I assume it moves pixels based on the color found on the normal map... however, I don't know how to go about doing this! I mean, I know how to move pixels.. just not in this particular fashion. I know how to implement shaders, do multitexturing, lighting, etc- I can do all the tutorials. What I don't understand however is how to do something "different"- something I havn't touched before. Any tips?

Graphics and GPU Programming Programming OpenGL

Started by MidgarZolom June 08, 2005 03:51 PM

10 comments, last by zedzeek 18 years, 10 months ago

James Trotter

432

June 09, 2005 10:02 AM

You're not being particularly specific. It sounds to me like you want someone to just hand you the code for the shader. I suggest that you rather tell us just what it is that you're having trouble with. It should be no problem if you know what's going on.

Cheers!

zedzeek

529

June 09, 2005 02:34 PM

from te look of it hte normalmap is just used as an offset for the texture coordinates in the shader very simple to code up
eg somrit like
texcord.xy = texcord.xy + normalmap.xy*0.01

Captain Courgette, eat more veg

GLSL "Bloom Effect"

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GLSL "Bloom Effect"

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