meta.placementBaseline key — the usd::xformop value an entity's geometry
blob was baked at. Lives in the entity's meta map, which is room-only:
snapshotToIfcx emits attributes/children/inherits but not meta, so this
never pollutes the IFCX wire. Every client renders blob + (current xformop relative to this baseline), so a late joiner that hydrates a blob baked at
M₀ while usd::xformop already reads M₁ still places it correctly.
meta.placementBaselinekey — theusd::xformopvalue an entity's geometry blob was baked at. Lives in the entity'smetamap, which is room-only:snapshotToIfcxemits attributes/children/inherits but notmeta, so this never pollutes the IFCX wire. Every client rendersblob + (current xformop relative to this baseline), so a late joiner that hydrates a blob baked at M₀ whileusd::xformopalready reads M₁ still places it correctly.