Thank you for posting the bug report, it is already giving some hints about this issue. I read “Cannot compute convex hull for ROI Object #1 of type plugins.kernel.roi.roi3d.ROI3DArea”. I am wondering if there is something special about the 3D ROI Area you are trying to convexify (its shape for instance). I am also wondering if the plugin Convexify ROI is correctly supporting 3D ROIs.
Could you have a look at this ROI with a display block (add a block “Add rois” after the creation of the ROI to add the ROI on the sequence and a display block after the sequence to display the sequence with the ROI)? You can double click on the image in the display block to open it in a classical viewer and play with the 2D and 3D views.
Could you also upload your protocol and an example image that is causing this issue?
Many thanks in advance.