Real-world numbers gathered from OSM (Overpass), Esri aerial imagery, and
frame-sampled onboard video. Replaces estimation with measurement.
Key findings:
* Loop radii MEASURED via Kasa circle fit on OSM ways: 27.5-204 m,
mean 131 m (469 studs). Two cleanest fits (rms<1.5) are the true
helixes at 147 m (525 studs) and 124 m (441 studs).
* 6 of 8 curved ramps turn CLOCKWISE - matches the video captions
'right, right and you will reach the PA'.
* FIVE deck layers in the interchange (OSM layer 1-5). Current
PA_LIFT=56 models only one; faithful build wants 3+ overhead.
* Real PA footprint 181x174 m (parking) / 203x227 m (rest_area).
Current APRON 210x200 m already matches well - the divergence is
SHAPE (square vs rounded wedge), not extent.
* Scale clarified: PA work uses M=3.571 studs/m, NOT the 4.3 in
c1_georeference.json (different mapping, 366 m median error).
Video reference archived to NAS 004-video-reference/ (364 MB, 4 routes).
Car meshes:
- CarManager: clone ReplicatedStorage/CarModels/<carId> as a visual Shell,
weld to Body, hide placeholder blocks. Falls back to procedural CarBody
when no mesh exists, so cars can be converted one at a time.
- Shell parts are Massless/CanCollide=false/CanQuery=false: the constraint
chassis and driving feel are untouched. Verified 0 violating parts live.
- 5 catalogue cars mapped from the 67-model ServerStorage/CarLibrary import.
Suspension (ref docs/CAR_PHYSICS_REFERENCE.txt, devforum 3915628):
- BUG: old k=9000 gave 1.10 studs static sag against 0.90 studs total travel,
i.e. the suspension sat permanently bottomed out and the spring did no work.
- Stiffness now solved from a sag target (70%% of half travel); damping now
derived as a damping ratio c = zeta*2*sqrt(k*m) instead of an unrelated
constant. Old pair worked out to zeta=0.31 (floaty); now 0.55-0.63.
- Measured after fix: ride height 1.97 studs, bounce 0.000, body roll 0.002.
Also: Circuit.inPA square test (PAFloor is 520x520, test was a r=260 circle,
corners falsely reported outside and spuriously armed runs), and void-fall
recovery now moves the character to the spawn pad BEFORE building the car.
Hermes