CydandClaude Fable 5 e846717283 BT410 5.3.65: THE MECH STANDS -- wire matrix convention proven from engine source ...

pose_chase.png: the MadCat assembled from its 19 parts, standing in the arena
at its live articulated position.  Feet, legs, torso, weapon pods, canopy
plate.  Not a collapsed stack at the origin, which is what every prior frame
actually showed.

The convention is no longer inferred -- it is read from the engine.
RootRenderable's ctor writes an entity pose into a DCS with
*(Matrix4x4*)dpl_GetDCSMatrix(myDCS) = localToWorld, so
Matrix4x4::operator=(const AffineMatrix&) IS the wire layout: row-major,
rotation in rows 0-2, zeros in column 3, translation in ROW 3 (entries
12/13/14).

The old 3/7/11 choice rested on two errors, both corrected in the code
comments: AffineMatrix does keep translation at 3/7/11, but because it is
COLUMN-major -- citing it as precedent for a row-major layout read the storage
and ignored the indexer (AFFNMTRX.HPP:99).  And 'the last row made the maths
blow up' came from the contaminated bisect; those crashes were the RIO fault.

Rotation now composes through the engine's own Matrix4x4::operator=(const
EulerAngles&) from the page's pitch/yaw/roll, and the node write uses the
RootRenderable idiom (dpl_GetDCSMatrix + assign).

Also banked: the chase-frame fifobridge variant -- camera framed on the
articulated root instead of the arena bounds -- as the offline proof harness
for any future pose question.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

2026-07-29 10:02:06 -05:00

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