https://ch.mathworks.com/matlabcentral/answers/598717-how-do-use-drawfreehand-to-create-a-3d-roi
How do use drawfreehand to create a 3D ROI? - MATLAB Answers - MATLAB Central
How do use drawfreehand to create a 3D ROI?. Learn more about drawfreehand scatter3, inroi
how doto create
https://au.mathworks.com/help/images/ref/drawfreehand.html
drawfreehand - Create customizable freehand ROI - MATLAB
The drawfreehand function creates a Freehand object that specifies the shape and position of a freehand region of interest (ROI).
createcustomizablefreehandroimatlab