Calculate quadrant boundary coordinates #335
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Previously, coordinates were treated like from the lower left corner of a quadrant. Thus, they were not allowed to touch any high face of the unit tree. We change this to make coordinates valid on all tree boundaries. We also allow coordinates as deep as P4EST_MAXLEVEL (quadrant midpoints). The idea is to use the coordinates to index any boundary object of a quadrant, thus any of its corners and face, edge, and volume midpoints.
We had relaxed the requirements on p4est_coordinates_is_valid, thus when reading a quadrant from a file, use the specific function to verify it.
mkirilin
previously approved these changes
Jan 30, 2025
Previously we were generating a root quadrant by calling p4est_quadrant_set_morton (q, 0, 0), which is less immediate.
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Calculate quadrant boundary coordinates
Proposed changes
Create functions to export any corner coordinates and face or odge midpoint of any valid p4est quadrant. The quadrant must thus be inside the unit tree. The coordinates may or may not be on any boundary of the unit tree.
This is an extension on top of #334. It can help the user create indexing the mesh topology and/or to use hashing to determine the quadrant connectivity.