Function: computeDashDistances()

function computeDashDistances(layout, input, transform, screen, period, out): void;

Experimental

Compute per-stream-vertex dash distances: [phase, segmentLength] pairs where phase is the cumulative screen-space length from the polyline (or post-gap) start modulo period, and segmentLength is the screen length of the segment leaving that vertex.

Storing the phase modulo the pattern period (computed in float64) keeps dashes exact on arbitrarily long lines, where a raw float32 cumulative length would lose sub-pixel precision.

Positions are recomputed in float64 from the source arrays (not the float32 stream) so the result matches the GPU projection. Vertices behind the camera (w ≤ 0) contribute zero length.

Parameters

Parameter	Type
layout	Pick<LineLayout, "vertexCount" | "source"> & object
input	Pick<LineGeometryInput, "x" | "y" | "z">
transform	{ offset: readonly [number, number, number]; scale: readonly [number, number, number]; }
transform.offset	readonly [number, number, number]
transform.scale	readonly [number, number, number]
screen	ScreenMatrix
period	number
out	Float32Array

Returns

void