[vtk-developers] Re: vtkProjectedTetrahedraMapper & IndependantComponents

[Jeff Lee]

Alright, I'm just going to come right out and say it - that looks cool 
as hell.
-J

Randall Hand wrote:

> oops.. Image attached for real :)
>
>
> On 4/5/06, *Randall Hand* <randall.hand at gmail.com 
> <mailto:randall.hand at gmail.com>> wrote:
>
>     Ok, I found the issue.  Related to that last discovery, it looks
>     like the Map2DependantComponents is suffering from a bit of "hasty
>     cut-n-paste" from the Map4DependantComponents function.  The two
>     scalar fields are never passed through the lookup tables, so the
>     first field is directly mapped to R, G, & B and the 4th field
>     (which technically doesn't exist) is mapped to the opacity. 
>
>     By modifying it to pass them through the colormap/opacitymap
>     functions it works marvelously :)  Image attached.
>
>     Filed as Bug #3098 :
>     http://www.vtk.org/Bug/bug.php?op=show&bugid=3098&pos=1
>     <http://www.vtk.org/Bug/bug.php?op=show&bugid=3098&pos=1>
>
>     btw, I can't get the bugsite to mail me my password so I had to
>     create a new one.. Email b0rked?
>
>
>     On 4/5/06, *Randall Hand* <randall.hand at gmail.com
>     <mailto:randall.hand at gmail.com>> wrote:
>
>         Also, while I'm at it... In the
>         vtkProjectedTetrahedraMapper.cxx around line 394
>         (Map2DependantComponents) is that a typo that you set
>         colors[3] = scalars[3]?  Shouldn't it be scalars[1] (2
>         components afterall) ?
>
>
>         On 4/5/06, *Randall Hand* <randall.hand at gmail.com
>         <mailto:randall.hand at gmail.com> > wrote:
>
>             Sending this to vtkUsers because i'm tired of fighting
>             against the 40k VTK-Developers limit.
>
>
>             Does the vtkProjectedTetrahedraMapper work with 2 or 4
>             component datasets? I have a dataset with a 2-component
>             scalar field (after alot of processing) where I want the
>             first component mapped to color and the the 2nd to
>             opacity.  Unfortunatly I seem to get the 2nd component
>             mapped to both opacity & a grayscale colormap.
>
>             I've attached 2 images.  the first (test-decent.jpg) is
>             with a single-component scalar mapped to both, showing
>             kinda how I expect it.  I modify it to add the extra
>             component for opacity, which should just make the top half
>             of the image (above the sphere) transparent.  According to
>             all the stats I gather on the resulting scalar field, it
>             looks good (number of points, number of components,
>             ranges, magnitudes, etc all look right).  The second (
>             test.jpg) is with the dual-component scalar showing what
>             comes out.
>
>             -- 
>             Randall Hand
>             Visualization Scientist,
>             ERDC-MSRC Vicksburg, MS
>             Homepage: http://www.yeraze.com
>
>
>
>             -- 
>             Randall Hand
>             Visualization Scientist,
>             ERDC-MSRC Vicksburg, MS
>             Homepage: http://www.yeraze.com
>
>
>
>
>         -- 
>         Randall Hand
>         Visualization Scientist,
>         ERDC-MSRC Vicksburg, MS
>         Homepage: http://www.yeraze.com
>
>
>
>
>     -- 
>     Randall Hand
>     Visualization Scientist,
>     ERDC-MSRC Vicksburg, MS
>     Homepage: http://www.yeraze.com
>
>
>
>
> -- 
> Randall Hand
> Visualization Scientist,
> ERDC-MSRC Vicksburg, MS
> Homepage: http://www.yeraze.com
> ------------------------------------------------------------------------
>
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>
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