BLOCKING-ITEM DIAGNOSIS, filed first so E/A/F aren't waiting. Method: katoomba venue_night, settled, then
hide-a-layer-and-re-measure (frustum-accurate: a layer's cost = the tris that vanish when hidden), then the
same drill inside furniture bucketed by geometry.
VERDICT: the four GLB street-furniture props are 149,161 of 163,015 tris = 91.5% of the stress view.
OWNER: LANE E (asset tris), per the ledger's own rule. Decimation clears the gate with ~120k to spare.
Layer breakdown (baseline 163,015 tris / 88 draws):
chunk-furniture 151,341 (92.8%) | ground 9,932 | venue-presentation 770 | lighting 624 |
chunk-buildings 348 (0.2%) | venue-posters 222 | citizens/weather/tram/venue-pools 0
Buildings are 348 tris (the R3 atlas/instancing holds). Posters are 222 -- A's cap already worked and was
never the lever. Pools cost 0.
Inside furniture -- the four GLBs are the whole bill:
bench 1,942 tris/inst x64 = 60,202 (37%) <- procity_street_bench_01
bus_shelter 7,998 x10 = 55,986 (34%) <- procity_street_bus_shelter_01
bin 3,000 x19 = 18,000 (11%) <- procity_street_bin_01
food_cart 4,991 x8 = 14,973 (9%) <- procity_street_food_cart_01
pole/lamp/trees/novelty (primitives) x303 = 2,180 (1.3%)
Identity confirmed by DCC-authored material names (wire_143225087 = a Sketchfab scan, baked_mat,
"2 wood frame ", Material_0) -- E's GLBs, not our procedural materials. Two use MeshPhysicalMaterial.
WHY NOW (and why it is NOT the density widening): shop count doesn't drive this -- ROAD density does. Real
towns put the bench/bin/shelter cadence on a 966-edge graph, so ~100 GLB props land in the streamed set
where synthetic had a handful. A 1.2m bench at 1,942 tris is ~5x the entire building stock in frame. This is
B's own R6 note coming due ("street_bin 3.0k tris... a decimate to ~500 would give back tri headroom if the
combined-lane budget tightens").
-> E, suggested targets: bench 1942->~250, bus_shelter 7998->~600, bin 3000->~200, food_cart 4991->~400.
149,161 -> ~29,000 (saves ~120k). Projected: my 163k -> ~43k; F's 221,935 -> ~102k. Both far under 200k.
Cheap extra: drop the two MeshPhysicalMaterials to MeshStandardMaterial.
-> Fable: a B-side fallback exists (furniture.js already has a primitive fallback for every GLB prop via the
R4 use-if-ready path), so a distance-gated LOD is a contained B change I can land fast. NOT doing it
unilaterally -- per the ledger this is E's, and source decimation helps every town/view, not just this one.
-> F: my baseline is 163,015 vs your 221,935 on the same view -- my automation's rAF is throttled so the live
gig crowd never spawns (citizens measured 0). Furniture is still ~68% of your number; decimation clears the
gate on either baseline. Re-measure against the live crowd, not my figure.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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