Talk:Physics engine

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This needs more cites, but it's a difficult topic to cite

Other than Second Life and Gary's Mod for Half Life 2, there aren't many easily accessible ways for non-programmers to experiment with physics engines.

Meanwhile, the documentation of how physics works in Second Life isn't written down anywhere in an official manual, but if you start experimenting with physics you will discover these operational conditions sooner or later.

I might eventually provide other video demonstrations like my SL exploding wheeled cart, since about the only way to show how it works is to actually do it and then record the results.

DMahalko 22:25, 27 April 2007 (UTC)[reply]

There are plenty of citations available. Look in SIGGRAPH papers from 1995-2005, especially those of Baraff. He did the impulse/constraint/linear complementarity approach to game physics. That's widely used because, even though it assumes idealized collisions and handles friction badly, it can be computed in nearly constant time for any given scene. Spring/damper methods are more realistic but sometimes slower. --John Nagle 00:06, 25 May 2007 (UTC)[reply]

Bouding Box?

In the first paragraph under the Game Engines, it says "The simplified mesh used for physics processing is often referred to as the bounding box." I believe a bounding box is not just any simplified mesh, but as its name suggests, is a box that bounds the object and is used for a preliminary test for collision or for the actual collision test itself. — Preceding unsigned comment added by 69.109.209.33 (talk • contribs)

Your're right. The correct term is "collision geometry". The collision geometry may be a simple box, but the state of the art is well past that. Fixed article. --John Nagle 04:21, 8 November 2007 (UTC)[reply]

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BetacommandBot 21:45, 6 November 2007 (UTC)[reply]

nVidia buys Ageia...

http://www.nvidia.com/object/io_1202161567170.html

That's interesting - it means that the patent issues that are thought to have clobbered the NV Physics SDK will magically "go away", so nVidia would be free to do Physics on the GPU much more cleanly. Hardware physics actually stands a chance of happening now! SteveBaker (talk) 21:19, 5 February 2008 (UTC)[reply]

I added Phun tot the list

I added Phun to the closed source/limited free distribution list. Phun is a 2D physics sandbox from Algoryx. I might add an article about it, as most things are well documented on our own wiki anyway.

~link0007 —Preceding unsigned comment added by 84.25.229.124 (talk) 16:16, 2 July 2008 (UTC)[reply]

Policy for listing engines and software?

I'd like to know the policy for referencing physics engines here. Apparently, several engines were deleted from the lists, as well as their entire entries in wikipedia - while some other engines are apparently still listed, and also still have their own entries in wikipedia intact. The policy for deletion appears to be pretty random, and this strikes at the quality of the entire topic.Kenbon (talk) 15:12, 8 October 2008 (UTC)[reply]

I doubt there is a well-defined policy, but my view is that if there is an article on a particular physics engine it should be linked to from here or (if the list gets too long) from a separate List of physics engines article. If engines currently linked to from this article are non-notable, their articles can be nominated for deletion. If the nomination is successful, then the resulting red-links should be removed from the list here. I am against the idea of simply listing every single engine that anyone has ever heard of with nothing more than a link to a website for that engine. That would turn Wikipedia into a directory rather than an encyclopedia. The downside of that is that the actual encyclopedic content gets lost in the mush.

In general, this article should not be a battleground for what is and is not a notable or important phsyics engine. If it is to list physics engines at all (which I think it should) it should list all of them that are worthy of articles in Wikipedia at large. No more, no less. GDallimore (Talk) 10:58, 9 October 2008 (UTC)[reply]

Well, I think the randomness of entries deleted for non-notability, and total lack of interest from editors to act consistently is a serious problem. Very, very few of the entries with their own pages have any sort of independent referencing, so if anyone suggested them for deletion, they would go away. However, the "suggest for deletion" process is totally random. I start to understand the all the criticism on wikipedia that exists. What do you think should be required specifically for a physics engine in terms of independent referencing to make a physics engine "notable"? —Preceding unsigned comment added by Kenbon (talk • contribs) 05:37, 10 October 2008 (UTC)[reply]

I'd like to know who the heck mentioned working model as 'high preicision'. I just spent a semester in a class learning how to use that thing, and it's horrendous - you can't even define reference geometry! Every time you want a reference item, you have to define an item, then tell it not to collide, and change its mass to zero, and then make it invisible after you connect things to it. Then, when you click run, unless you set your frames to be ridiculously close together, it will come up with some problem about how an object passed entirely through another since the last frame. —Preceding unsigned comment added by 24.121.161.224 (talk) 03:54, 24 December 2008 (UTC)[reply]

Engine missing from the list

just mengioning there is Digital molecular matter missing from the engine list :D —Preceding unsigned comment added by 90.191.39.41 (talk) 02:17, 15 April 2009 (UTC)[reply]