Search found 58 matches

by Eternl Knight
Sat Aug 12, 2006 8:21 am
Forum: Non-technical forum and license/patent discussion
Topic: Another Havok ccd patent, most of it has prior art
Replies: 2
Views: 11529

Of course, the prior art doesn't really matter if you're a small-time developer (i.e. don't have a large litigation defence fund). As with most software patents, the threat is in the lawsuit itself - not the winning of said lawsuit. It costs ALOT of money to defend oneself against patent litigation,...
by Eternl Knight
Mon Apr 17, 2006 12:18 am
Forum: General Bullet Physics Support and Feedback
Topic: More Bullet improvements, check out new demo (updated)
Replies: 5
Views: 5375

Very nice demonstration, Erwin. I quite like the fact that you can turn on & off different features (like the LCP & GJK functionality) to determine the differences.

Is the underlying Bullet distro for this released yet?

--EK
by Eternl Knight
Wed Apr 05, 2006 12:10 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Which LCP's solver have been used by popular physics engine?
Replies: 24
Views: 33373

OK, I think the trick here is to look at the exact wording... "not based on traditional LCP or iterative methods". This does not necessarily imply that he is not using LCP or iterative methods - just that he is not using the traditional ones. For example, he has stated in these boards that Newton DO...
by Eternl Knight
Sat Mar 25, 2006 10:53 pm
Forum: Non-technical forum and license/patent discussion
Topic: Zlib/MIT/LGPL/GPL Collision Detection Library License
Replies: 8
Views: 20577

OK - given that Erwin is cool with a licensing discussion, I'll fill in the blanks I left in the last post :) Firstly, there is the factors inherent in NDA's and proprietary systems which make GPL & (most) LGPL use impossible. The license of the (L)GPL software requires either the disclosure of code...
by Eternl Knight
Sat Mar 25, 2006 6:23 am
Forum: Non-technical forum and license/patent discussion
Topic: Zlib/MIT/LGPL/GPL Collision Detection Library License
Replies: 8
Views: 20577

Exactly, it DOES depend on the person's opinion. I, for example, disagree that the GPL guarantees my freedom more than the LGPL. Thing is, getting into these discussions are best left for a "licensing forum". I come here for the physics engine discussion (of which there is more than enough complexit...
by Eternl Knight
Sun Mar 19, 2006 11:18 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: Which LCP's solver have been used by popular physics engine?
Replies: 24
Views: 33373

Um, dude - read what he said I used to work for Havok, and currently I work for Sony on the Playstation 3 port of Novodex/PhysX. In other words - he KNOWS that Havok at the very least USED to use an iterative solver, and that Novodex/PhysX actually does. ODE we know uses it and comments from the aut...
by Eternl Knight
Sun Mar 05, 2006 11:46 pm
Forum: General Bullet Physics Support and Feedback
Topic: Optimization for many physics controller objects on map!
Replies: 6
Views: 6554

Do you have an estimate on when the sweep&prune method will be added, Erwin? I am currently looking at bullet as the collision/physics library (i.e. combined with ODE) for a simulation experiment I am playing with. Currently I've hacked my sim to put all objects into two layered "quad" spaces but th...
by Eternl Knight
Wed Feb 22, 2006 2:33 am
Forum: Non-technical forum and license/patent discussion
Topic: Patents on physics simulation / collision detection
Replies: 8
Views: 18652

I'm not saying you can WIN based on not reading the patents, but you will be liable for only 1/3 the damages. Given the language most patent applications are written in - there is no way you can economically perform due diligence when searching for software patents (pharmaceutical & "physical" engin...
by Eternl Knight
Wed Feb 22, 2006 1:21 am
Forum: Non-technical forum and license/patent discussion
Topic: Patents on physics simulation / collision detection
Replies: 8
Views: 18652

That makes no sense. Patents are by definition made public. That is the reason for their existence. If they're not publically available - they are not a patent, but either an application for one or a trade secret. The Patents Database is open for anyone to search - and hence is "publically available...
by Eternl Knight
Tue Feb 21, 2006 8:31 am
Forum: Non-technical forum and license/patent discussion
Topic: Patents on physics simulation / collision detection
Replies: 8
Views: 18652

Actually, with patents - it does. If someone suing you over a patent can prove you were aware of the patent - you are liable for triple damages. This is known as "willful infringement". Ask any intellectual property lawyer about software patents and they will advise you to do the same as I have - to...
by Eternl Knight
Mon Feb 20, 2006 9:11 am
Forum: Non-technical forum and license/patent discussion
Topic: Patents on physics simulation / collision detection
Replies: 8
Views: 18652

I would also recommend that no-one read them. Regardless of the fact that patenting physics algorithms is questionable at best, reading them will allow any litigators to use "willful infringement" against you. I will not argue the pros/cons of software patents, but every lawyer I have talked to abou...
by Eternl Knight
Thu Feb 16, 2006 3:15 am
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: New physics engine in academia
Replies: 9
Views: 8582

I was not implying that DaVinci was a "flash in the pan" type project. I am personally hoping it isn't, as a complete engine that optimised for accuracy (as compared to tose that optimise for speed) would be very useful in a wide variety of simulation scenarios. Not everyone wants/needs something th...
by Eternl Knight
Wed Feb 15, 2006 10:47 pm
Forum: Research and development discussion about Collision Detection and Physics Simulation
Topic: New physics engine in academia
Replies: 9
Views: 8582

Yeah, but there are only a handful of GOOD rendering engines out there. Most the others are... "underdeveloped". This is how I feel about most the "new" physics engines that come out lately. I'm hoping for better from the DaVinci one as it progresses, but I feel that "perhaps" it's going to remain t...