MfixReader User Guide

6. Requesting Coordinates

The coordinates, after the space filter has been applied, can be obtained for any open dataset using

   int MfixReaderGetCoordinates(
     int handle,
     enum MfixReaderFormat format,
     char **units,
     int *dims[3],
     float **xyz
)

The format can be used to select between two sets of coordinates:

MRF_cell or MRF_node_average

coordinates for the standard grid are returned

MRF_node_center

coordinates for a grid with vertices at the centers of the cells are returned

The grid for the cell centers will be smaller by 1 along each axis than the standard grid. Therefore, the cell-center grid should not be requested when the standard grid is less than 2 cells along any coordinate.

The returned array xyz contains the cartesian coordinates where the components of the vertex (X,Y,Z) change fastest and Z changes slowest. If the original MFIX coordinate system is cylindrical, it is converted to cartesian.

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