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Write module_offset as a float, and declare offset_units
Two latent traps in the NXtransformations attributes, both inert today and both
wrong the moment they are not.

module_offset was an int32 with @vector = (0,0,0). NXmx types the field NX_FLOAT,
and a translation needs a unit vector to be well formed - the direction of a
zero-magnitude translation is arbitrary, not absent. Now a float with (0,0,1);
the transformation it describes is unchanged, since the magnitude is still zero.

Every transformation that carries an @offset wrote it without @offset_units, and
every caller passed an empty string. A reader then falls back to the axis's own
`units` - which on a rotation axis is degrees - and converts a length from
degrees to millimetres. nxmx only performs that conversion when the offset is
non-zero, so ours have never triggered it, but the first non-zero offset on a
goniometer axis would. The helper now always declares it, rather than leaving it
to a caller to remember.

Measured after the change: module_offset is H5T_IEEE_F32LE, a rotation axis
carries offset_units "m" beside units "deg", dials.import still reads the file,
and the tilted-geometry cross-check is unchanged at 1.6e-6 mm.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-22 23:14:40 +02:00
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