stencil shadow volume

**noeska** · 07-09-2004, 04:14 PM

until know i used projective stencil shadows, but they work only with planes like a floor or wall. So i decided to take the step to stencil shadow volumes. But to no avail yet. Are the some tutorials that explain the topic in plain english?

I tried looking at the stencil shadow volume example from http://www.codesampler.com/oglsrc.htm but that only seem to be able to cast shadows from a plane? I would like to cast a shadow volume from one mesh on another mesh.

**Paulius** · 07-09-2004, 05:38 PM

Try Googleing on the topic. There's a Delphi demo of it at Delphi3d http://www.delphi3d.net/download/stencilshadows.zip

**noeska** · 07-09-2004, 06:02 PM

i know that demo, but i dont understand it, i dont need a demo, i need some documentation that explains what is going on in plain english.

Also googling led me to numerous examples i even tried implementing some, but i get no shadows out of them other then with the supplied mesh. There must be something special on that mesh. As casting with a complicated mesh needs some extra do, the delphi3d demo does that, but i cannot quit follow it. It is supposed to find a siloutte using edges?

**noeska** · 08-10-2004, 02:46 PM

I stopped trying to get shadows working, i do get something that sometimes looks good (zpas), but not always. So i propably need zfail, but i cannot seem to be able to implement that.

Is there some good explanation on how to create an silhoutte? I looked at the nehe tutotial on the subject, but it seems that the tutorial is different from the supplied sourcecode?

Is not there a shadow volume tutorial for dummies or the likes?

**tux** · 10-11-2004, 04:53 PM

ive also got the nehe demo in front of me (delphi and c++) but ive got my mesh structure as vertex array, normal array, and the indexes to them in a face record. im stuck on the connectivity (doesnt help that all the comments in the delphi version arent english

)

noeska, mabey we can work together to get both our codes working well :lol:

**noeska** · 10-11-2004, 05:06 PM

yes, would be ok. But i cannot spend time on it in the next week. Also i still do not understand connectivity yet fully. Tomorow i will dig up my code so far on the subject. Be aware that it uses gl3ds.