Add four new section types to the level editor:
- dropOff: instant vertical drop with gentle downward tail
- gap: flat lead-in, x-gap, flat landing at same height
- lip: flat run into a steepening (t²) kicker ramp
- dropGap: like gap but landing is well below takeoff
Fix Terrain physics body generation to extrude straight down from
segment endpoints instead of using rotated rectangles. A previous
perpendicular-offset approach caused near-vertical segments (dropOff
cliffs) to balloon physics bodies sideways under adjacent terrain,
making the bus ride above the drawn ground.
Update level03 ("Mind the Gap") to use editor-generated terrain data.
Generalize levelBuilder smoothing to detect gap-shaped sections
(structurally via takeoffPoints/landingPoints) rather than by type
string, so future gap types work automatically.
Correct the rectangle center offset calculation in Terrain to account
for both X and Y components perpendicular to each segment. Previously,
only the Y offset was applied, causing physics bodies to shift sideways
on sloped terrain. This fix resolves the bus visibly riding above or
through the ground on non-flat segments.
Also adds background and logo assets.
Replace flat green ground fill with layered subsoil/road/foliage bands
that match the parallax background palette. Add pebble texture on the
road surface and sparse grass tufts along the edge for visual depth.
Use a hash-based PRNG instead of Math.random() so decorative elements
remain consistent across level rebuilds.
Brian Fertig