[Paraview] use the same scalar data to create contour and color the surface

[Tom Schoenemann]

OK, but is there some way to combine two image files, each with its own scalars, into one image?  What I'm thinking about is reading in 2 copies of the same image, and using the scalars from one to display the contour, and the scalars from the other to display the colors?  I tried doing this, but I can't get it to work. I loaded one as the contour, and colored it one color only (white).  I then added the copy, an tried to view it as a volume.  It let me change the color map parameters, but it seems to display the color UNDERNEATH the first one (that has the contour.  I'm sure there must be a way to do this, but how?

Perhaps there is a way to add 2 scalar fields to one image? Maybe image calculator could do this??

-Tom

On Apr 8, 2012, at 8:30 AM, Cory Quammen wrote:

> Tom,
> 
> An isosurface by definition has the same scalar value everywhere on
> the surface, so what you describe happening is exactly what should
> happen, unless I misunderstand. You could contour by one scalar field
> and color by another scalar field and expect to see different colors,
> but if you try to color by the same scalar, you should expect to see
> only one color on the surface.
> 
> Cory
> 
> On Sun, Apr 8, 2012 at 3:38 AM, Tom Schoenemann <toms at indiana.edu> wrote:
>> I have a single volume dataset that has scalar values only on a surface, and
>> zeros everywhere else.  The scalar values represent statistics we have
>> calculated for each point on a surface.  I've been able using the contour
>> filter to create an isosurface from this dataset, but I can't get the
>> surface to display anything other than a single color.  I have tried setting
>> "contour by" to "compute normals" and "compute scalars", and then going to
>> "display" and choosing "color by" scalars.  However, only a single value is
>> allowed.  I have tried unselecting "automatically rescale to fit data range"
>> and then entering my own range, but only my minimum value is accepted (even
>> if I enter a different value for the maximum).
>> 
>> Perhaps I am using paraview the wrong way, but I have to say, it isn't
>> intuitive.  Is there a way to use the same scalar data (same file) to both:
>> 1) create a surface, and 2) color code the surface based on the same scalar
>> values?
>> 
>> Thanks for any hints or suggestions.
>> 
>> -Tom
>> 
>> 
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> 
> 
> 
> -- 
> Cory Quammen
> Research Associate
> Department of Computer Science
> The University of North Carolina at Chapel Hill


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