Thank you very much for your help. I called and tested it according to the way you provided to implement off-axis addition. I found that the display based on Poly was relatively correct. However, when I used dicom data to display voxel rendering, I couldn’t see the correct effect. The phenomenon was that only a very local picture was seen in the camera. And at this time, the vtkRenderWindowInteractor seemed not to work. I couldn’t zoom out the camera through the mouse to see the full picture. How should I control the camera in this case? Do I need to write an Interactor based on controlling the eyeposition by myself? Of course, it would be great if there were an example of voxel rendering based on Dicom and the effect of the off-axis camera was achieved. Because our naked-eye 3D product has an eye tracking process that can obtain the coordinates of the centers of the left and right eyes. I want to determine the degree of absolute shear through this coordinate. At the same time, I also hope that the mouse operation can work at the same time. That is, the binocular camera and the focal plane are regarded as a whole. The matrix of their parent node is controlled by the mouse. I don’t know if it can be achieved. Thank you very much.