message: fix .expandBySphere and .expand in Sphere3D
diff: @@ -107,13 +107,15 @@ namespace Sphere3D {
  }
  /** Expand sphere radius by another sphere */
  - export function expandBySphere(out: Sphere3D, sphere: Sphere3D) {
  - out.radius = Math.max(out.radius, Vec3.distance(out.center, sphere.center) + sphere.radius)
  + export function expandBySphere(out: Sphere3D, sphere: Sphere3D, by: Sphere3D) {
  + Vec3.copy(out.center, sphere.center)
  + out.radius = Math.max(sphere.radius, Vec3.distance(sphere.center, by.center) + by.radius)
  return out
  }
  /** Expand sphere radius by delta */
  export function expand(out: Sphere3D, sphere: Sphere3D, delta: number): Sphere3D {
  + Vec3.copy(out.center, sphere.center)
  out.radius = sphere.radius + delta
  return out
  }
  