[vtk-developers] interpolate scalars blog post

[Biddiscombe, John A.]

Pat

Very useful.

One suggestion. Where you write

"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.

$0.02

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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