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docs(prds): file PRD-537 and PRD-538 - #464
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Streaming invalidations re-render Machinefall's whole 4096 shadow map 200-280 times per walk, which keeps PRD-478's walking GPU p95 above 8.3 ms early in the route. Redraw only the dirty pages instead.
Machinefall trees end at the streaming ring (about 256-360 m) on a 2 km map. The engine already keeps whole-map far impostor aggregates behind WorldCells impostors: true, which the game never sets; it stays off for the PR #375 shadow regression. The cell proxy GLBs hold props, not trees, so they are not the fix.
This was referenced Oct 8, 2026
jonit-dev
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TL;DR
Files PRD-537 and PRD-538 in one docs-only PR. It replaces #459 and #460, which each carried one file.
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docs/PRDs/open-world/PRD-537-far-hills-show-the-forest.mddocs/PRDs/open-world/PRD-538-shadow-maps-redraw-only-what-streamed-in.md(3 commits kept)Not run
pnpm check:docsdid not run locally (fresh worktree, nonode_modules). CI runs the docs lane.