What happens in the 3D view in the video can be achieved by enabling “Crop” in the Volume Rendering module, and apply a transform node on the ROI used for cropping the volume in the 3D view. If that transform node is transformed by the StylusTipTo… transform, then the volume will be cropped relative to the StylusTip position. The tumor contour is a different node, a yellow surface model not cropped by the ROI, so that is always visible.
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