archipack_stair.py 文件源码

def get_proj_matrix(self, part, t, nose_y):
        # a matrix to project verts
        # into uv space for horizontal parts of this step
        # so uv = (rM * vertex).to_2d()
        tl = t - nose_y / self.get_length("LEFT")
        tr = t - nose_y / self.get_length("RIGHT")
        t2, part, dz, shape = self.get_part(tl, "LEFT")
        p0 = part.lerp(t2)
        t2, part, dz, shape = self.get_part(tr, "RIGHT")
        p1 = part.lerp(t2)
        v = (p1 - p0).normalized()
        return Matrix([
            [-v.y, v.x, 0, p0.x],
            [v.x, v.y, 0, p0.y],
            [0, 0, 1, 0],
            [0, 0, 0, 1]
        ]).inverted()