maj00r 4a9bfdc0aa Section-index visual streaming (no per-cycle twin re-scan) ...

Replaces the camera-distance ring passes with section-following streaming and a
persistent section index, so a million-node scenery no longer re-scans the whole
twin every time the camera moves into new ground.

- v9 node marker also stores range_max; a model visible from beyond the stream
  radius (or unlimited) is built once up front, the rest stream by section so
  distant landmarks/traction/buildings don't pop out while flora stays local.
- Reader gains node_offset()/seek_node(); cParser exposes the deepest twin's
  file/path/offset/params and seekReplayNode/setReplayParams to rebuild one node.
- First visual pass indexes every deferred node (models via the dispatch fast
  path, origin-placed flora/shapes in deserialize_node) under its region section
  while building the spawn area; later cycles rebuild only the newly-wanted
  sections by seeking straight to their nodes -- O(visible), not O(whole twin).
- Build-all fallback retained for ghostview with no camera centre.

Known: absolute terrain triangles (no origin) still build in the first pass; only
origin-placed content section-streams. Untested in-game (format bump needs a
rebake).

2026-06-24 23:56:53 +02:00

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