how to debug draw box cast

//box cast extents are the same as would be used in Physics.BoxCast
//hitPoint is the RaycastHit.point returned from the boxcast

Vector3 upperLeft, upperRight, lowerLeft, lowerRight;
upperLeft = new Vector3(
    transform.position.x - 0.5f * boxCastExtents.x,
    transform.position.y + 0.5f * boxCastExtents.y,
    transform.position.z);

upperRight = new Vector3(
    transform.position.x + 0.5f * boxCastExtents.x,
    transform.position.y + 0.5f * boxCastExtents.y,
    transform.position.z);

lowerLeft = new Vector3(
    transform.position.x - 0.5f * boxCastExtents.x,
    transform.position.y - 0.5f * boxCastExtents.y,
    transform.position.z);

lowerRight = new Vector3(
    transform.position.x + 0.5f * boxCastExtents.x,
    transform.position.y - 0.5f * boxCastExtents.y,
    transform.position.z);

Vector3 upperLeft1, upperRight1, lowerLeft1, lowerRight1;
upperLeft1 = new Vector3(
    hitPoint.x - 0.5f * boxCastExtents.x,
    hitPoint.y + 0.5f * boxCastExtents.y,
    hitPoint.z);

upperRight1 = new Vector3(
    hitPoint.x + 0.5f * boxCastExtents.x,
    hitPoint.y + 0.5f * boxCastExtents.y,
    hitPoint.z);

lowerLeft1 = new Vector3(
    hitPoint.x - 0.5f * boxCastExtents.x,
    hitPoint.y - 0.5f * boxCastExtents.y,
    hitPoint.z);

lowerRight1 = new Vector3(
    hitPoint.x + 0.5f * boxCastExtents.x,
    hitPoint.y - 0.5f * boxCastExtents.y,
    hitPoint.z);

Debug.DrawLine(upperLeft, upperLeft + 100f * transform.forward, color, 1.25f * Time.deltaTime);
Debug.DrawLine(upperRight, upperRight + 100f* transform.forward, color, 1.25f * Time.deltaTime);
Debug.DrawLine(lowerLeft, lowerLeft + 100f * transform.forward, color, 1.25f * Time.deltaTime);
Debug.DrawLine(lowerRight, lowerRight + 100f * transform.forward, color, 1.25f * Time.deltaTime);