Function ghostAlphas

packages/cli/src/commands/motionShotLayout.ts:104–112

(n: number)

 *  the newest frame solid, so the composite of real painted frames reads as a
 *  motion trail leading to the final pose. One alpha in [0,1] per sample. */
export function ghostAlphas(n: number): number[] {
  if (n <= 0) return [];
  if (n === 1) return [1];
  const lo = 0.14;
  return Array.from(
    { length: n },
    (_, i) => Math.round((lo + (1 - lo) * (i / (n - 1))) * 1000) / 1000,
  );
}

/** Scale+centre transform that fits `pts` into a W×H frame (with padding). */
export function fitTransform(