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Export fieldmap in a different coordinate system
Posted 2 févr. 2015, 13:27 UTC−5 Version 5.0 2 Replies
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Hello,
I am wondering if it is possible (easily!) to export a simulated fieldmap in a coordinate system which is different from the global coordinate system (origin moved, and axes rotated). I would like to do this because the geometry is best modelled in a certain coordinate system, but another application needs the fieldmap in another system.
Thank you
Daniel
I am wondering if it is possible (easily!) to export a simulated fieldmap in a coordinate system which is different from the global coordinate system (origin moved, and axes rotated). I would like to do this because the geometry is best modelled in a certain coordinate system, but another application needs the fieldmap in another system.
Thank you
Daniel
2 Replies Last Post 9 févr. 2015, 08:16 UTC−5
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Posted:
1 decade ago
Hi Daniel,
1) you can define under definitions a coordinate system of your choice, eg. a cylindrical one.
2) You can write out coordinate data e.g. (sys2.r,sys2.phi,sys2.z) just as you would write out any data.
3) data will by default be exported within the mesh points, so you will get additionally (x,y,z) out which I don't think yopu can suppress
4) if you need your data e.g. on a cylindrical grid, you may want to defrine those points r(i), phi(i), z(i) in a data file and chose the export option "points to evaluate in" --> "from file".
This should bring you a step further to what you want to achieve - if not, let me know.
Sven
1) you can define under definitions a coordinate system of your choice, eg. a cylindrical one.
2) You can write out coordinate data e.g. (sys2.r,sys2.phi,sys2.z) just as you would write out any data.
3) data will by default be exported within the mesh points, so you will get additionally (x,y,z) out which I don't think yopu can suppress
4) if you need your data e.g. on a cylindrical grid, you may want to defrine those points r(i), phi(i), z(i) in a data file and chose the export option "points to evaluate in" --> "from file".
This should bring you a step further to what you want to achieve - if not, let me know.
Sven
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Posted:
1 decade ago
Hello,
Thank you. Finally I used java to do the following:
- loop over a regular grid in my custom coordinate system
- using a 4x4 transformation matrix T (rotation+translation) I transform these points to the global CS
- write out the (x,y,z) coordinates of the points in the global CS into a file
- define this file as the set of points for evaluation, as you suggested in point 4)
- In order that the electric field (which is a vector quantity) be written out finally in my custom CS, I define 3 quantities to be exported: Rxx*Ex+Rxy*Ey+Rxz*Ez, Ryx*Ex+Ryy*Ey+Ryz*Ez, Rzx*Ex+Rzy*Ey+Rzz*Ez, where the R matrix is the rotational part (upper left 3x3 matrix) of the inverse of T
- The output file now contains the global (x,y,z) coordinates and the transformed E-field components, so I post-process this file and transform these global coordinates to the local ones using the inverse of the T matrix. I write out the transformed coordinates and the field components to my final fieldmap file.
This works.
Thank you. Finally I used java to do the following:
- loop over a regular grid in my custom coordinate system
- using a 4x4 transformation matrix T (rotation+translation) I transform these points to the global CS
- write out the (x,y,z) coordinates of the points in the global CS into a file
- define this file as the set of points for evaluation, as you suggested in point 4)
- In order that the electric field (which is a vector quantity) be written out finally in my custom CS, I define 3 quantities to be exported: Rxx*Ex+Rxy*Ey+Rxz*Ez, Ryx*Ex+Ryy*Ey+Ryz*Ez, Rzx*Ex+Rzy*Ey+Rzz*Ez, where the R matrix is the rotational part (upper left 3x3 matrix) of the inverse of T
- The output file now contains the global (x,y,z) coordinates and the transformed E-field components, so I post-process this file and transform these global coordinates to the local ones using the inverse of the T matrix. I write out the transformed coordinates and the field components to my final fieldmap file.
This works.