![]() So to use the arctan function with Y and X coords, you could do the following: arctan2( for point in points], for point in points])Īfter a little more investigation, there may be a slightly nicer way to get coordsX/Y/Z: pointsĪnother helpful reference is the numpy_interface algorithms. To use the co-ordinates you need to extract them like so: for point in points] Please use the history if you want to access the old version of this document. This is actually an array of all the points, each of which is an array of x, y and z coords. ParaView/Users Guide/Python Programmable Filter - KitwarePublic ParaView/Users Guide/Python Programmable Filter < ParaView PAGE DELETED The Users Guide has been moved from the Wiki to The ParaView Guide. To access the coordsX and coordsY is a bit tricky, but can be achieved using the points variable. There are numpy docs for trigonometric functions, but annoyingly you can't use all the functions directly, for example you can do arctan2(x1, x2), but you can't do pi and have to use numpy.pi.įor context, there are PythonCalculator docs too. You can use the numpy extensions of the Python Calculator in ParaView, but numpy have called the function arctan2 rather than atan2. Now, the question is: How can I access the cell coordinates in the Python calculator? The Python Programmable Filter is a powerful tool for data analysis in ParaView, as it enables you to implement ParaView readers and filters using Python. Is there any easy way to implementing something like the atan2 using the graphical interface?Īny comments are much appreciated, thanks!Īfter Neil Twist pointed out, that in the Python Calculator the inverse tangent function can be called as arctan2(y, x), I'm now facing the problem that I can't access the coordinates of a cell via the variables coordsX/Y/Z, that are available in the simple Calculator filter. Such a function does not seem to be supplied by the Calculator Filter or the Python Calculator Filter. This usually is achieved using an extra function like atan2 in C. R = sqrt(coordsX^2 + coordsY^2 + coordsZ^2)įor the azimuthal vector I'm aware that I would have to take care of the quadrant of (x,y) when using So far I defined the following result variables that give the expected results: However, python calculator can only take one vector at a time. It’s possible to use the expression mag (U) in the python calculator filter but there is one drawback. I would like to calculate magnitude of a vector in the programmable filter. This I want to do over a domain of a quarter-sphere: ParaView/Users Guide/Python Programmable Filter < ParaView PAGE DELETED The Users Guide has been moved from the Wiki to The ParaView Guide. massisenergy (Massisenergy) August 28, 2021, 12:30pm 1. This uses the numpysupport and vtk.datasetadapter modules : from paraview. ![]() ![]() I'm currently trying to convert given Cartesian coordinates (x,y,z) to spherical coordinates (r, theta, phi) using the ParaView Calculator-Filter, where theta is the polar angle and phi the azimuthal angle. Reading the Paraview python API, found the following solution to convert back and forth between VTKArray and numpy arrays.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |