FLUX field file — DEX (.dex)

The DEX format stores a single nodal field for Altair/CEDRAT FLUX (electromagnetic and thermal simulation), the field companion to the FLUX mesh (.pf3), following FEconv.

Format name	dex
Extensions	.dex
Read / Write	✓ / ✓
Extra dependencies	—

Reading & writing

Native numeric tokens view the source. D/d exponents normalize into a short terminated stack buffer, with an owned fallback for unusually long fields; numeric-prefix behavior, signed zero and owned result arrays are unchanged. The source-copy comparison records the measured scope and unchanged writer bytes.

The native reader views mapped/buffered source lines and returns owned arrays/names, preserving CRLF handling and numeric extraction. Writer bytes are unchanged; the line-view benchmark supplies the required scalar nodal field.

import meshioplusplus

field = meshioplusplus.read("field.dex")        # geometry-less Mesh
meshioplusplus.dex.write("out.dex", field)

File structure

A two-line header delimited by #, then one row per point holding the point coordinates (x y z) followed by its NB_COMP field values:

# NAME = PIECE FORMULA = mGradT
NB_REAL = 1 NB_COMP = 3 NB_POINT = 25419 #
16.8621677515026 32.8775510204082 0 -4612.18830812659 31808.9451403159 0
...

Data mapping

DEX is read into a geometry-less Mesh (no cells) whose points come from the coordinates and whose point_data[<FORMULA>] holds the values (shape (NB_POINT, NB_COMP), or 1-D when NB_COMP == 1). On write, the first point_data array supplies the values, the piece name defaults to PIECE, and the field name comes from the data key. Fields are at nodes only.

Notes

• Implemented against the FEconv format documentation (FEconv is GPL; no code or data is copied — fixtures are generated by round-trip).