[x3d-public] Nurbs patch coloring

[Andreas Plesch]

> Date: Wed, 22 Apr 2020 12:14:12 +0300
> From: Michail Vidiassov <master at iaas.msu.ru>
>
> On Tue, Apr 21, 2020 at 5:29 PM Andreas Plesch <andreasplesch at gmail.com> wrote:
>
> > I implemented and tested the four corner color interpolation approach.
> > I did not add transparency although this requires 'only' some book
> > keeping. [ Not sure if x3dom deals well with RGBA vertex colors
> > although it should ].
>
> It does deal, lists ColorRGBA as supported in the docs, but does not
> deal well: I can see lines and background through the surface made
> transparent by RGBA vertex colors, but not another (yellow) surface.
> http://media.iaas.msu.ru/x3d_RGBA_test.htm

Please add to the Shape

<Appearance sorttype='transparent'></Appearance>

x3dom currently needs that to recognize that the shape is transparent.

Thanks, Andreas

> But you also stated that:
> > Viewer capabilities and conformance are important but secondary to design and spec. decisions.
>
> So in the next round of NURBS coloring activity it is reasonable to add the A.
>
> > Please find an x3dom build here:
> > Take a look at the build and please try it with other examples,
>
> OK, for now the ball is in my court, there is a lot to try and test
> with RGB vertex color.
>
> Sincerely, Michail

-- 
Andreas Plesch
Waltham, MA 02453