Real-time OpenGL shadow volumes demo

Here is a little demo I cooked up to show how real-time shadow volumes are made with OpenGL. This use's zfail shadow volumes, the technique John Carmack uses in the popular Doom 3 videogame.

Music by showster1232000 (http://freesound.iua.upf.edu/usersViewSingle.php?id=359043) loop41.wav (http://freesound.iua.upf.edu/samplesViewSingle.php?id=40147)

Category:

Film & Animation

Tags:

• 3d
• opengl
• render
• shadows

[pebolzaonaczyc]

Can you explain me how you use z-fail algorithm? :F

I use z-pass watch?v=9SVuJdSEdk4

And I have closed shadow volumes

But the z-fail algorithm dosen't work properly :S some tips will be helpfull

[trektactoe]

Just make sure your silhouette detection is properly made. Draw your caps and silhouette in the color buffer to look for any anomalies.

[pebolzaonaczyc]

z-pass or z-fail?

[trektactoe]

One or the other, switchable at will.

[Slip819]

very impressive!

[raliotenabona]

Great work. I'd really love to know how to make that sort of shadows...

[pebolzaonaczyc]

lol thx hehe :)