[vtk-developers] Re: vtkProjectedTetrahedraMapper & IndependantComponents

[Randall Hand]

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

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> 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> 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
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