[vtk-developers] interpolate scalars blog post

[Utkarsh Ayachit]

Very neat indeed! Thanks for writing this up.

Utkarsh

On Mon, Dec 3, 2012 at 6:46 AM, Pat Marion <pat.marion at kitware.com> wrote:
> 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
>>
>>
>>
>> “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 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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