After registering portals-only connector cells for VISIBILITY (d90c538), an
angle-dependent residual grey remained when the camera crossed a ramp: the
camera-collision sweep (SmartBox::update_viewer -> sphere_path.curr_cell, pc:92870)
could not transit INTO the connector cell because it had no physics cell to sweep
into — CacheCellStruct was still gated on drawable sub-meshes. So the viewer cell
stalled one cell behind the eye (confirmed live: [flap-sweep] transited every cached
neighbour but NEVER the un-cached connector 0x014D, viewerCell stuck at 0x00070103
while the eye sat 1.32 m past the connector's portal plane), and the side test
correctly culled the on-screen connector portal -> grey.
Fix: move CacheCellStruct out of the `cellSubMeshes.Count > 0` gate, next to
BuildLoadedCell — cache EVERY cell with a valid cellStruct for physics too. Retail
keeps the whole landblock cell array resident for the sweep; a portals-only
connector has an empty collision BSP but its portals drive the transit. User-gated:
"I see no grey background any longer."
Build green; 12 flood-gate tests + 677 physics/cell/transit tests green (no collision
or membership regression). TEMP render probes still retained (strip after).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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