[ODE] Quickstep and patents
Hendrix_ at gmx.net
Thu Jun 7 07:13:59 MST 2007
this is really funny!
How exactly do these patents work? Is only the *full interaction of
all parts* patented (e.g. SOR + Systemmatrix + Mass-matrix), or *all
single parts seperately*?
For each single part, there should be thousands of references BEFORE
2004. For example, Gauss-Seidel originates at least back to 1855
(that is when Gauss died), SOR is a modification also known a long time.
Massmatrix should be covered in any "applied engineering" book
covering physical properties.
"Jacobian" of joint-freedoms, OMG how old is that exactly? I think
the introduction of lambda is a smart move, but there should be a
reference for that, too. BTW, Mr. Jacobi died 1851.
On 06.06.2007, at 21:46, metanet software wrote:
> I'm working on a physics solver, and have recently discovered that
> several well-known techniques are in fact patented. I'm eager to
> opensource my project, however doing so will make it obvious what
> methods i'm using, and one of them is definitely patented.
> From discussion on the Bullet forums, it appears that Ageia holds a
> patent related to ODE's quickstep solver: http://www.patentstorm.us/
> Has there been any trouble with these patents and ODE? I'm thinking
> specifically about the various big-budget commercial games released
> with ODE.. did Ageia extract any sort of licensing/blackmail fees
> from the developers?
> I'm just trying to get a sense of whether Ageia actually enforces
> these ridiculous patents or they're just there to make them look
> good in stockholders' eyes.
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