junction

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Where roads meet: the road surface between their mouths, with rounded corners, stop lines and the lanes through it (ctx.world.junction).

Built at load as <id>-surface, a mesh and trimesh collider 5 mm under the roads, so a road that carries on through it is drawn over it.

Use it in a scene entity's components list as { "type": "junction", … }. The contract writes the fields flat and refuses unknown keys.

Fields

Field	Type	Required	Default	Description
`arms`	`JunctionArm[]`	yes		The roads that meet here: two arms or more in all (a through road counts twice).
`cornerRadiusM`	`number`	no	`6`	Radius of each corner where two arms meet, metres, 0 or more. Default 6.
`stopLines`	`boolean`	no	`true`	A stop line across each arm's lane in. Default true.
`keepLeft`	`boolean`	no	`false`	Traffic keeps left (the lanes and stop lines swap sides). Default false.
`material`	`PhysicsMaterial`	no		Physics material of the junction's surface (its grip, its `surface` kind). Default: the engine's default.