Marlin cubic bezier accuracy !

[Laurent Bourgès]

Hi alexey,

Thanks, I will look at your code to check its accuracy on few hard cases,
but marlin uses its own (fast) variant (higher error)...

Anyway it will help me as I can ask you questions!

See
https://github.com/bourgesl/marlin-renderer/blob/75f91452efaf3c607b0df6b7aa0f6f458cda67a8/src/main/java/org/marlin/pisces/DHelpers.java#L252

Cheers,
Laurent

Le lun. 21 oct. 2024, 10:26, <alexey.ushakov at jetbrains.com> a écrit :

> Hi Laurent,
>
> Actually part of the work (separating curves into monotonic ones) I've
> implemented in Java years ago, see ProcessQuad/ProcessCubic
>
> https://github.com/openjdk/jdk/blob/master/src/java.desktop/share/classes/sun/java2d/loops/ProcessPath.java
>
> I suppose applying some kind of Newton algorithm to the monotonic parts
> should be no-brainer.
>
> Best Regards,
> Alexey
>
> On Thu, 2024-10-17 at 11:33 -0700, Philip Race wrote:
> > Hi Laurent,
> >
> > I think there'd be problems with any of these.
> > I can't see the JDK depending on Rust, and some optionally available
> > functionality would
> > be very unusual.  And it'll be some time before we work out how the
> > JDK
> > itself will use
> > jextract etc for FFM access to non-JDK libraries. There's 3rd party
> > legal issues and build issues.
> >
> > -phil.
> >
> > On 10/12/24 2:27 AM, Laurent Bourgès wrote:
> > > Hi,
> > >
> > > I wonder if I could use good math native library like gsl if
> > > present
> > > to use FFM in order to have high accuracy on polynom eval, solver
> > > for
> > > quadratic & cubic polynoms.
> > >
> > > I need an high accuracy (double double) solver for cubics & quads
> > > to
> > > compute intersection line & cubic bezier.
> > > See http://www.cemyuksel.com/research/polynomials/
> > >
> > > Alternatively I could write a julia or rust code to implement my
> > > needs
> > > and link it with openjdk.
> > >
> > > See my paper work,
> > > Good week-end,
> > > Laurent
> >
>
>
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