Hmmm could you post screenshots of:
- shadow volumes drawn (no stencil) frontface in a color, backface in another color (with blending enabled so we can see everything).
- GL_INCR pass.
- GL_DECR pass (did you intialize the stencil buffer with 1 ? The result you obtain is weird).
Shadows volumes: what's wrong ??!
Author
i've done something better: i've downloaded the shadows volumes code from codesampler and inserted my object class.
i've uploaded code and bin here:
http://www.neoborn.com/users/b3rs3rk/shadow%20demo.rar
F1 shows the volume.
something strange happens: the shadow is rendered only from a point of view, if you rotate the camera it disappear :/
i've uploaded code and bin here:
http://www.neoborn.com/users/b3rs3rk/shadow%20demo.rar
F1 shows the volume.
something strange happens: the shadow is rendered only from a point of view, if you rotate the camera it disappear :/
maybe the shadow volumes you render are incorrect..
I can imagine if you render each shadow volume triangle both front and back faced you could end up with lines because of slight differences between the triangles?
just a guess.
i'd run your demo if my computer at work would be capable at actually running your demo..
I can imagine if you render each shadow volume triangle both front and back faced you could end up with lines because of slight differences between the triangles?
just a guess.
i'd run your demo if my computer at work would be capable at actually running your demo..
Author
Quote:Original post by LogicalError
i'd run your demo if my computer at work would be capable at actually running your demo..
why? what's the problem? video card?
I looked at your demo. The shadow volume for the quad is wrong.
Do you want me to try and fix it ?
BTW the shadow volume for the teapot is wrong as well :D
Do you want me to try and fix it ?
BTW the shadow volume for the teapot is wrong as well :D
Author
Quote:Original post by rodzilla
I looked at your demo. The shadow volume for the quad is wrong.
Do you want me to try and fix it ?
BTW the shadow volume for the teapot is wrong as well :D
yes!thanks!
OK. To get a quick fix for your example, you'll just have to reverse the orientation of the first triangle in your model (swap 2 vertices).
Your demo will work (kind of) but basically your shadow volume generation algorithm is broken (will only work for *some* models).
You will probably want to read the following article: http://legion.gibbering.net/projectx/paper/paper.pdf
It describes an excellent algorithm that will work with *all* models.
Another point is the floor. Look below the floor and you'll see the shadow as well. To avoid this, the floor should cast a shadow as well.
Hope it helps (sorry, I wish I'd have time to help you more).
Your demo will work (kind of) but basically your shadow volume generation algorithm is broken (will only work for *some* models).
You will probably want to read the following article: http://legion.gibbering.net/projectx/paper/paper.pdf
It describes an excellent algorithm that will work with *all* models.
Another point is the floor. Look below the floor and you'll see the shadow as well. To avoid this, the floor should cast a shadow as well.
Hope it helps (sorry, I wish I'd have time to help you more).
I'll post my implementation of the paper's algorithm if you wish (as soon as I reboot to Linux).
BTW, the paper was written by RipTorn (forgot to mention it ; thanx RipTorn !).
Hmmm and thanx ! I had only coded z-fail method until you mentionned your problems. I have z-pass as well now. :D
BTW, the paper was written by RipTorn (forgot to mention it ; thanx RipTorn !).
Hmmm and thanx ! I had only coded z-fail method until you mentionned your problems. I have z-pass as well now. :D
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