[Paraview] Visualization ternary saturation

[Cory Quammen]

> I tried it your way in ParaView 5.3.0, and it did not work correctly. Are
> you sure this is implemented in 5.3 and not a new feature in the upcoming
> 5.4?

Ken,

This was implemented some time ago. In 5.3.0, I could do the following:

* Add Sphere Source
* Add Programmable Filter with the Script set to

A = inputs[0].PointData['Normals'][:,0]
B = inputs[0].PointData['Normals'][:,1]
C = inputs[0].PointData['Normals'][:,2]
colors = numpy.empty((len(A),3), dtype='float')
colors[:,0] = A
colors[:,1] = B
colors[:,2] = C
output.PointData.append(colors, 'colors')

* Turn off Map Scalars

You could also skip this silly use of the Programmable Filter
altogether and color the Sphere source by 'Normals', then turn Map
Scalars off.

I believe the capability to treat floating-point arrays of 3-tuples
was added to VTK in commit

commit 00de9a942ff74e797fbe4cd8c67307c8065cdade
Author: Dan Lipsa <dan.lipsa at kitware.com>
Date:   Thu Nov 20 13:35:35 2014 -0500

    Add VTK_COLOR_MODE_DIRECT_SCALARS. See vtkScalarsToColors::MapScalars.

- Cory

> From: Shawn Waldon [mailto:shawn.waldon at kitware.com]
> Sent: Monday, May 8, 2017 12:11 PM
> To: Moreland, Kenneth <kmorel at sandia.gov>
> Cc: Thomas Oliveira <thomas.oliveira at gmail.com>; ParaView
> <paraview at paraview.org>
> Subject: [EXTERNAL] Re: [Paraview] Visualization ternary saturation
>
>
>
> Ken beat me to answering this one... I'll just add that if the data is
> floating point in the range [0, 1], you don't need to convert it to uint8 or
> multiply by 255.  Just creating a floating point vector will give the same
> result.  This is a more recent extension of the functionality: I know it
> works in 5.3 and master but I'm not sure how many versions back support it.
>
> A = inputs[0].CellData['A']
>
> B = inputs[0].CellData['B']
>
> C = inputs[0].CellData['C']
>
> colors = numpy.empty((len(A),3), dtype='float')
>
> colors[:,0] = A
>
> colors[:,1] = B
>
> colors[:,2] = C
>
> output.CellData.append(colors, 'colors')
>
>
> HTH,
>
> Shawn
>
>
>
> On Mon, May 8, 2017 at 1:56 PM, Moreland, Kenneth <kmorel at sandia.gov> wrote:
>
> ParaView does not directly support ternary color maps, but if you create a
> field of colors (represented by three unsigned chars), then you can render
> those colors directly by turning off the Map Scalars option. You can create
> these colors with a Programmable Filter with a script like the following:
>
>
>
> A = inputs[0].CellData['A']
>
> B = inputs[0].CellData['B']
>
> C = inputs[0].CellData['C']
>
> colors = numpy.empty((len(A),3), dtype='uint8')
>
> colors[:,0] = A*255
>
> colors[:,1] = B*255
>
> colors[:,2] = C*255
>
> output.CellData.append(colors, 'colors')
>
>
>
> Once you apply that script, color by the new “colors” array and uncheck the
> box marked “Map Scalars” (it is an advanced option in the properties panel).
>
>
>
> -Ken
>
>
>
> From: ParaView [mailto:paraview-bounces at paraview.org] On Behalf Of Thomas
> Oliveira
> Sent: Saturday, May 6, 2017 7:24 AM
> To: ParaView <paraview at paraview.org>
> Subject: [EXTERNAL] [Paraview] Visualization ternary saturation
>
>
>
> Dear all,
>
> Given three cell arrays (A,B,C) representation saturations (A+B+C = 1 for
> every cell) is it possible to generate a ternary saturation image like the
> one attached (obtained in
> http://www.esss.com.br/Kraken/wp-content/uploads/2014/07/Ternary-Saturation.png)?
>
> In the figure, A, B, C are saturations of water, oil and gas.
>
> Best regards,
>
> Thomas Oliveira
>
>
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>
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-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.