<p style="font-size: 12px;color:#aaa;">版权引用：<a href="https://www.behance.net/gallery/44375157/Free-Motion-Camera-Rig"><span style="font-size: 12px;color:black;">“TheoryProblem. During the camera animation work we are always dealing with at least one Main Point of Action (MPA),which we are currently looking at. Very basic way to control MPA by camera is to constrain angle of view to "target" point.But when we do that we lose complete control of Rotation which became dynamically generated by "look at target" constrain, and camera movement becomes unpredictable.  In other hand, if we use just basic transforms of the camera, we never can precisely control MPA, especially in motion, because every rotation will be to turn camera away from MPA.Basic Solution. If we set up camera on ring around MPA we can precisely control all possible view angles with only three simple parameters: Distance, Horizon angle, Vertical angle (all relatively to MPA). This is a common solution in camera animation strategy, but a little bit further things may go complicated. If we need more than simple ring movement, it's always easy to start adding unnecessary node......”</span> </a>由 <a href=""><span style="font-size: 12px;color:black;"></span></a> 授权许可 <span><a href="https://creativecommons.org/licenses/by/4.0/deed.zh" target="_blank" style="font-size: 12px;color:black;">Attribution 4.0 International<img src="" style="display: inline-block;height: 16px;width: auto;"></a></span></p>