DrawableTerrain

World-space bounding sphere radius around vertexOrigin that conservatively contains every vertex of this terrain tile (including peak elevation). Used by per-cascade cullers (see earth.worldwind.layer.shadow.ShadowState.CascadeState.intersectsSphere) to skip tiles that fall entirely outside a cascade's footprint. 0 opts out of culling.

World→UV matrix for draping this tile's surface-shape texture onto 3D-Tile meshes; null when unavailable this frame (no draped meshes, 2D projection, offset copies).