How to change axis in surface plot from Cartesian to logarithmic

[Refaat_Galal (Refaat G Hashish)]

Hi everyone,

I am new user of Paraview. I have the following surface plot in which the x- and y-axis are in Cartesian scale. I would like to know how to change the scale of x-axis to logarithmic.

[mwestphal (Mathieu Westphal (Kitware))]

Not possible in the 3D view afaik.

[Refaat_Galal (Refaat G Hashish)]

The figure is 2D (surface) plot.

[mwestphal (Mathieu Westphal (Kitware))]

Yes, but you are still in the 3D view, not in a chart view (which support log).

[wascott (Walter Alan Scott)]

@kmorel What do you think? Good idea?

[Refaat_Galal (Refaat G Hashish)]

Any good ideas will be helpful.

[Kenneth_Moreland]

I can see the utility of a log scale, but it could be problematic in the 3D view as things get undefined <= 0.

An easy workaround is to use the Calculator filter to compute the log of the point coordinates.

[wascott (Walter Alan Scott)]

Ken, I agree. Not a good feature to add to ParaView. Rafaat, as Ken mentions, try the calculator filter. Although i have not looked, I bet it is covered in the ParaView Guide.

[Refaat_Galal (Refaat G Hashish)]

I have used the calculator feature before to evaluate change in pressure, temperature, etc but I am not sure how to use it for the coordinates. Any guide for this step? I am sorry, I am new user of Paraview.

[wascott (Walter Alan Scott)]

Please look in the ParaView guide, chapter 9.1. You can find the ParaView guide through the Help menu.

[cory.quammen (Cory Quammen (Kitware))]

https://docs.paraview.org/en/latest/UsersGuide/filteringData.html#filters-for-attribute-manipulation

[wascott (Walter Alan Scott)]

Thanks Cory. I should have added the link.

[Refaat_Galal (Refaat G Hashish)]

Dears all, following the guide lines in the manual, I find that I can evaluate new array of the logarithm of x, y, or z coordinates. I can’t find away to plot the data versus the evaluated array on surface plot. Attached is a surface plot of log10(coordsX) versus X.