[Paraview] Import Preset color scale only if not already loaded

[Utkarsh Ayachit]

Something like following should do the trick:

def HasPreset(name):
     presets = servermanager.vtkSMTransferFunctionPresets()
     for i in range(presets.GetNumberOfPresets()):
         if presets.GetPresetName(i) == name:
             return True
     return False



On Thu, Sep 8, 2016 at 3:52 AM,  <postgurke at web.de> wrote:
> Hello All
>
> I haven't been able to find a solution for this, so maybe someone can give me a
> hint...:
> I am loading data via a python script into ParaView (5.0) and want to color it
> with a specific color scale. I can load this scale with the script and apply the
> coloring as desired but if the scale is already loaded, it will then be loaded
> twice (or more). What I would like to do is check if the scale is loaded and if
> yes apply it, if not first load and then apply.
> I tought, that try/except would be my friend here, but applying a preset that is
> not loaded doesn't throw an error but uses the default Cool to Warm scale
> instead... What is also somewhat strange: if I had the specific scale loaded in
> a ParaView session, but removed it from the list of presets, ParaView can
> somehow remember it nonetheless and shows the data correctly (i.e. not with the
> Cool to Warm scale but the specific one).
> Does somebody have an idea how I can avoid having the specific scale loaded
> multiple times and still have the python script always producing the correct
> visualization of the data set?
>
> Here is the code I was trying:
> ...
> zLUT=GetColorTransferFunction(ts)
> try:
>         zLUT.ApplyPreset(colorname,False)
> except:
>         ImportPresets(filename=colorname+'.json')
>         zLUT.ApplyPreset(colorname,False)
> ...
>
>
> Thank you very much!
> Venke
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