collision.py 文件源码

def project_point(pt, v):
    """ Return projection of point with given direction vector """
    proj = Vector()
    # project on X
    if v.y == 0:
        l = 0
    else:
        l = - pt.y / v.y
    proj.z = pt.x + l * v.x
    # project on Y
    if v.z == 0:
        l = 0
    else:
        l = - pt.z / v.z
    proj.y = pt.x + l * v.x
    # project on Z
    proj.x = pt.y + l * v.y
    return proj