PDA

View Full Version : soft shadows



marko
08-24-2003, 10:41 AM
soft shadows

http://www.cs.man.ac.uk/~gibsons/pubs/egsr03.html

Translucent Shadow Maps

http://www9.informatik.uni-erlangen.de/Persons/Stamminger/Research/Research/tsm


Penumbra Maps

http://www.cs.utah.edu/~wyman/publications/index.html#PenumbraMaps

wacom
08-24-2003, 11:37 AM
Thank you for finding and sharing all of this info Marko. I'd like to see Newtek use techniques that are ahead of other companies- or better solutions- than just trying to match them. If Newtek isn't doing some of these things on their own (and I believe they are) than incorporating these individuals knowledge wouldn't hurt.

Beamtracer
08-25-2003, 12:49 AM
Hey those things are really interesting.

For anyone who hasn't clicked on those links, they consist of proposals for new algorithms that would allow a 3D renderer to calculate more natural shadows.

I've often wondered how people make money by creating algorithms, then publishing them. Can someone copyright an algorithm?

Karmacop
08-25-2003, 01:15 AM
You can't patent a mathematical formula

Titus
08-25-2003, 10:21 AM
You can patent an algorithm or a technique. Pixar has a technique with soft shadows you don't want to implement on your own renderer, that's for sure.

wacom
08-25-2003, 10:46 PM
I wrote Chris out of desperation.
I think we should tell Newtek to either tell us what they are doing to the renderer, or get some assistance if they can afford it (and really they can NOT afford it in the long run).

Anyway here is what Chris Wyman had to say:

"I appreciate your interest in using my work, and would be pleased to see it used in Lightwave. I would suggest that you talk to NewTek. As a Lightwave user, I expect you have more influence over future features than I do as a researcher.

As far as information about my technique, I believe that the work can be reproduced using the information provided in the paper "Penumber Maps: Approximate Soft Shadows in Real-Time." However, I would be willing to provide some additional help to anyone implementing my technique for a commercial product.

Thanks,
-Chris"

Well "anyone" could be Newtek...or Alias if they don't contact people like this...

Karmacop
08-25-2003, 11:54 PM
Yes, you can patent a software algorithm but not a mathematical formula (against the recommendation of the courts). How are these two things different? Who can say ...

Anyway, I hope Newtek tries to contact more researchers like this so we can implement new tech (that's sot of a pun) into Lightwave like they did with HDRI.

Hervé
08-26-2003, 12:36 AM
Is'nt it all that story infact just about money...?

Now who the heck is M. Wyman ?

cavalos
08-26-2003, 08:04 PM
Hey Marko jeez! I honetly admire you for such a persistence on rendering algorithms...I hope NT will see some of theese!

Best
Christian