Record the placement an entity's geometry blob was baked at (the value of
usd::xformop when the blob was seeded — identity for legacy STEP models
whose geometry is baked world-absolute). Idempotent: only the first write
sticks, so re-seeding never moves the baseline out from under live edits.
Record the placement an entity's geometry blob was baked at (the value of
usd::xformopwhen the blob was seeded — identity for legacy STEP models whose geometry is baked world-absolute). Idempotent: only the first write sticks, so re-seeding never moves the baseline out from under live edits.