Get view direction relative to scene in vispy?
问题 What is the cleanest way to get the view direction relative to your scene in vispy? view.scene.transform contains a whole chain of transforms: In [88]: view.scene.transform Out[88]: <ChainTransform [<STTransform scale=[ 960. -540. 1. 1.] translate=[ 960. 540. 0. 0.] at 0x139757309901840>, MatrixTransform(matrix=[[26.44507, 0.0, 0.0, 0.0], [0.0, 47.013458, 0.0, 0.0], [0.0, 0.0, -1e-06, 0.0], [-0.0, -0.0, -0.0, 1.0]] at 0x7f1bc8d526d0), <Inverse of '<ChainTransform [MatrixTransform(matrix=[[0