[vtk-developers] interpolate scalars blog post

[Pat Marion]

Great suggestion, thanks!  I think you're right, some extra text there
could help drive home the point.  I inserted your text word for word, but I
left out the last part in parentheses, it's a good point but it I think it
might reach a bit beyond the scope of what's shown in the supporting images.

Pat


On Mon, Dec 3, 2012 at 7:09 PM, Biddiscombe, John A. <biddisco at cscs.ch>wrote:

>  Pat****
>
> ** **
>
> Very useful. ****
>
> ** **
>
> One suggestion. Where you write ****
>
> ** **
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> “Oops, not so colorful anymore.  The color is interpolated between the
> vertices, and the result doesn't look anything like the color map.  The
> same effect occurs for wireframe visualization too:”****
>
> ** **
>
> I think you should add something like “It’s important to notice that when
> InterpolateScalarsBeforeMapping is off, the colours are interpolated using
> the opengl vertex RGB values and this can lead to the appearance of colours
> in your visualization which *do not appear at all* in your original
> colour map. (This is because the 2D interpolation in RGB space between
> vertices will not follow the same path as the interpolation along the 1D
> colour map)”****
>
> ** **
>
> It’s obvious from the pictures what’s going on, but I suspect that some
> people will not quite appreciate some of the subtle implications and some
> extra text might help.****
>
> ** **
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> $0.02****
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> ** **
>
> JB****
>
> ** **
>
> *From:* vtk-developers-bounces at vtk.org [mailto:
> vtk-developers-bounces at vtk.org] *On Behalf Of *Pat Marion
> *Sent:* 01 December 2012 03:35
> *To:* vtkdev; Communications
> *Subject:* [vtk-developers] interpolate scalars blog post****
>
> ** **
>
> I was recently explaining InterpolateScalarsBeforeMapping<http://www.vtk.org/doc/nightly/html/classvtkMapper.html#a9e0262837bb18752277a6a9c7b972583>to someone, and decided it would be useful to have a visual aid, so I wrote
> a blog post.
>
> http://www.kitware.com/blog/home/post/414
>
> Comments, and typo / factual corrections are appreciated, thanks!
>
> Pat ****
>
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