Virtual Texturing Support Matrix

Capability	Support level	Scope	Diagnostics
Albedo terrain VT family	supported	Runtime pages the albedo family; this is the current albedo-only VT runtime path.	estimated_gpu_memory where budget risk is knowable.
Normal terrain VT family	unsupported	Python accepts normal for forward compatibility, but native runtime pages only albedo; MapScene.validate reports vt.normal before render.	vt_unsupported_family.
Mask terrain VT family	unsupported	Python accepts mask for forward compatibility, but native runtime pages only albedo; MapScene.validate reports vt.mask before render.	vt_unsupported_family.
Runtime residency stats	underdeveloped	Lower-level stats exist; product validation integration is reported through large-scene diagnostics where metadata is available.	unavailable_cache_lod_stats diagnostic when unavailable.

Non-albedo family requests must not silently skip. They are diagnosed before render through vt_unsupported_family; this non-MVP-blocking deferral is an explicit unsupported runtime status, not a runtime implementation for those families.