ray_caster.py 文件源码

def get_camera_params(box, size, view_angle):
    box_size = box.size()

    size_diagonal = math.hypot(*size)

    if view_angle is None:
        focal_length = size_diagonal  # Normal lens by default
    else:
        focal_length = size_diagonal / (2 * math.tan(math.radians(view_angle) / 2))

    distance = focal_length * max(_zero_if_inf(box_size.x) / size[0],
                                  _zero_if_inf(box_size.z) / size[1])

    if distance == 0:
        distance = 1

    distance *= 1.2  # 20% margin around the object

    origin = box.midpoint() - util.Vector(0, distance + _zero_if_inf(box_size.y) / 2, 0)
    direction = util.Vector(0, 1, 0)
    up = util.Vector(0, 0, 1)

    return (origin, direction, up, focal_length)