has Ground Coverage Mask
true when at least one 3D-Tile mesh layer enqueued into DrawableGroup.SURFACE this frame — terrain stencil-tests against GROUND_COVERED_BIT. Propagated from RC via Frame.
true when at least one 3D-Tile mesh layer enqueued into DrawableGroup.SURFACE this frame — terrain stencil-tests against GROUND_COVERED_BIT. Propagated from RC via Frame.