Set a user defined lookup table to replace default "Cool to Warm"

Development
1

Dear Expert,

I found the default lookup table is “Cool to Warm”, How can i change this default one into “hsv”.

And further, i want to use a user specific defined lookup table, how can i do it in programmatic way ,
to make it as as the default lookup table

Thanks and Best Regards,
Sharon

2

N̶o̶t̶ ̶p̶o̶s̶s̶i̶b̶l̶e̶ ̶i̶n̶ ̶P̶a̶r̶a̶V̶i̶e̶w̶,̶ ̶b̶u̶t̶ ̶a̶ ̶g̶r̶e̶a̶t̶ ̶f̶e̶a̶t̶u̶r̶e̶ ̶i̶d̶e̶a̶ ̶n̶o̶n̶e̶t̶h̶e̶l̶e̶s̶s̶.̶ ̶ ̶P̶l̶e̶a̶s̶e̶ ̶o̶p̶e̶n̶ ̶a̶n̶ ̶i̶s̶s̶u̶e̶ ̶o̶n̶ ̶o̶u̶r̶ ̶g̶i̶t̶l̶a̶b̶ ̶t̶o̶ ̶t̶r̶a̶c̶k̶ ̶i̶t̶.̶

Not true, see below.

3

Thank you Mathieu for you reply!
OK, I will put it on the gitlab.

4

Hi Mathieu,

what about if set a user defined color for a MultiBlockDataSet in the reader plugin?
How can do this?

5

T̶h̶e̶ ̶w̶o̶u̶l̶d̶ ̶b̶e̶ ̶t̶h̶e̶ ̶s̶a̶m̶e̶ ̶m̶i̶s̶s̶i̶n̶g̶ ̶f̶e̶a̶t̶u̶r̶e̶ ̶i̶m̶o̶.̶

Not true, see below.

6

Actually, this is possible in ParaView. You can set a custom default color map via the ParaView settings controller. Set up a std::string with some JSON that defines the default color map:

{
        "lookup_tables" : 
        {
                "PVLookupTable" : 
                {
                        "ColorSpace" : 0,
                        "RGBPoints" : 
                        [
                                -0.97492790222167969,
                                1.0,
                                0.0,
                                0.0,
                                -0.6499512848625183,
                                1.0,
                                0.0,
                                1.0,
                                -0.32497564243125909,
                                0.0,
                                0.0,
                                1.0,
                                0.0,
                                0.0,
                                1.0,
                                1.0,
                                0.32497271764755253,
                                0.0,
                                1.0,
                                0.0,
                                0.64994543529510507,
                                1.0,
                                1.0,
                                0.0,
                                0.97492790222167969,
                                1.0,
                                0.0,
                                0.0
                        ]
                }
        }
}

This happens to be the “hsv” color map (which I highly recommend you avoid, but that’s a separate topic).

To load the JSON, use

#include <vtkSMSettings.h>

std::string settings = "your json here";
vtkSMSettings::GetInstance()->AddCollectionFromString(settings, VTK_DOUBLE_MAX);
7

So the feature is indeed already in ParaView GUI, albeit a litle bit hidden.

Here is how to do it :

  • Open ParaView
  • Show your dataset
  • Modify the color map to your needs
  • Click on this button at the very bottom of the color map editor
    2019-10-30-131504_191x70_scrot
  • This color map is now the default one for any newly displayed data
  • It is saved in the settings, so it will stay the default even if you start ParaView again
  • It works with categories as well
8

Hi Cory,

Thank you very much for your reply!!
sorry for coming back later…

What about if i want to load different sources and want them to use different lookup table?
In my situation, i need load 3 different sources, and first source i want to use block index color as default, the second source i want use lookup table as default, the third source i want to use another lookup table as default.

Thanks and Best Regards,
Sharon

9

Hi Mathieu,

Thank you very much for your reply!!

Just as i replied to Cory, i need different default color schema for different source…

Thanks and Best Regards,
Sharon

10

Not supported in ParaView yet.

11

Thank you Mathieu for your reply!
Best Regards