[Paraview] Visualization ternary saturation

Tue May 9 11:11:26 EDT 2017

Aha! I figured out the issue. Yes, ParaView correctly shows floating point colors when in the Surface representation, but it does not work for the Slice representation. (I happened to be creating data on a Mandelbrot source.)

I raised a bug: https://gitlab.kitware.com/paraview/paraview/issues/17423

-Ken

From: Dan Lipsa [mailto:dan.lipsa at kitware.com]
Sent: Tuesday, May 9, 2017 7:59 AM
To: Quammen, Cory (External Contacts) <cory.quammen at kitware.com>
Cc: Moreland, Kenneth <kmorel at sandia.gov>; Waldon, Shawn (External Contacts) <shawn.waldon at kitware.com>; ParaView <paraview at paraview.org>
Subject: [EXTERNAL] Re: [Paraview] Visualization ternary saturation

Hi all,

Indeed, rather than supporting only 'unsigned char' for direct color mapping - using color mode VTK_COLOR_MODE_DEFAULT, all integer and floating point types can be used for direct color mapping using the color mode VTK_COLOR_MODE_DIRECT_SCALARS.
Integer type colors should be between 0-255 and floating point colors should be between 0-1.

Dan

On Mon, May 8, 2017 at 10:16 PM, Cory Quammen <cory.quammen at kitware.com<mailto:cory.quammen at kitware.com>> wrote:
> 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<mailto: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<mailto:shawn.waldon at kitware.com>]
> Sent: Monday, May 8, 2017 12:11 PM
> To: Moreland, Kenneth <kmorel at sandia.gov<mailto:kmorel at sandia.gov>>
> Cc: Thomas Oliveira <thomas.oliveira at gmail.com<mailto:thomas.oliveira at gmail.com>>; ParaView
> <paraview at paraview.org<mailto: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<mailto: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<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<mailto: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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--
Cory Quammen
Staff R&D Engineer
Kitware, Inc.

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