Nearly every track is one model repeated: cn3, a wall bar whose gauge
image is two closed 25x5 rectangles. Five metres of wall thickness is
finer than the plan can resolve, so each bar was landing as two parallel
lines plus two end caps - several hundred times over, which is the
hatching that swamped the arenas. Collapse a thin closed quad to the
centreline between its short edges: one stroke for one wall.
Walls stacked to build height coincide seen from above, so draw each
distinct wall once. And drop placements standing alone more than 200
units from any other - fourteen tracks park a single bar at (1200,0,0)
well off the course, and that one placement stretched the frame to
twelve times the width of the track. The four tracks without it are
exactly the four that always framed correctly. A real branch keeps its
neighbours and stays: Paingod's second canyon is sixty bars out at
x=-400.
Cyd
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