You can’t. The view-up vector is hard-coded. You can transpose image matrix in any external image editor.
You can rotate the input volume by 90 degrees by applying a transform.
Thank you, Mik and Andras.
Hello, thank you for all of this information. I’m trying to generate multiple DRRs for a neural network training set. I want to maximize resolution, make the DRRs look as much like the XR as possible. Speed is not a huge issue for me. I’ve tried the volume rendering module but it doesn’t seem like I can get extremely high resolution. Maybe this is just a limit of DRR. Which method do you think will work best for my purpose?