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List:       gnuplot-info-beta
Subject:    Re: [RFC] Gradient fill options
From:       Pierre <pierre.php () gmail ! com>
Date:       2007-02-07 20:14:24
Message-ID: fe05d1540702071214x21c83444x7051e4c66a85e87f () mail ! gmail ! com
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On 2/7/07, Pierre <pierre.php@gmail.com> wrote:
> On 2/7/07, Ethan Merritt <merritt@u.washington.edu> wrote:
> > On Wednesday 07 February 2007 11:44, Hans-Bernhard Bröker wrote:
> > > Pierre wrote:
> > >
> > > > I'm not sure to understand why it is biased. Each vertex color is
> > > > known. The first vertex is the top left one, after they have been
> > > > sorted.
> > >
> > > The bias lies in picking the top left vertex as "the first".
> > > This can cause nasty effects like: the same triangle comes out subtly
> > > different if the scene is rendered upside down or rotated by 90 degress,
> > > even though the result should be exactly the same.
> >
> > That is true, but the failure mode is usually harmless. If you rotate the
> > triangle in 3D its coloring may change very slightly, but if it is a
> > single facet of a larger surface this will probably not be noticed since
> > the adjacent triangles are similarly affected.
>
> I will add a custom version to test these cases using numerical
> results (output the edges values to a file and compare them). We can
> then see if the error is acceptable. As you say, I do not expect any
> noticeable differences.

By the way, any help is welcome. If someone volunteers to write these
tests, he will be more than welcome :)

--Pierre

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