VTK Learning Thirty-six- rotate polydata

pyvista 讀取vtk 文件，旋轉之後，並另存。

import pyvista as pv
# 讀取polydata
mesh=pv.read("door.vtp")
mesh.plot()
# 繞z 軸旋轉180
mesh.rotate_z(180)
print(mesh)
mesh.plot()
# 保存旋轉之後的結果
mesh.save("door.vtp")

旋轉之前：

旋轉之後：

pyvista 旋轉操作源碼

def rotate_z(self, angle):
        """Rotate mesh about the z-axis.

        Parameters
        ----------
        angle : float
            Angle in degrees to rotate about the z-axis.

        """
        axis_rotation(self.points, angle, inplace=True, axis='z')

def axis_rotation(points, angle, inplace=False, deg=True, axis='z'):
    """Rotate points angle (in deg) about an axis."""
    axis = axis.lower()

    # Copy original array to if not inplace
    if not inplace:
        points = points.copy()

    # Convert angle to radians
    if deg:
        angle *= np.pi / 180

    if axis == 'x':
        y = points[:, 1] * np.cos(angle) - points[:, 2] * np.sin(angle)
        z = points[:, 1] * np.sin(angle) + points[:, 2] * np.cos(angle)
        points[:, 1] = y
        points[:, 2] = z
    elif axis == 'y':
        x = points[:, 0] * np.cos(angle) + points[:, 2] * np.sin(angle)
        z = - points[:, 0] * np.sin(angle) + points[:, 2] * np.cos(angle)
        points[:, 0] = x
        points[:, 2] = z
    elif axis == 'z':
        x = points[:, 0] * np.cos(angle) - points[:, 1] * np.sin(angle)
        y = points[:, 0] * np.sin(angle) + points[:, 1] * np.cos(angle)
        points[:, 0] = x
        points[:, 1] = y
    else:
        raise Exception('invalid axis.  Must be either "x", "y", or "z"')

    if not inplace:
        return points