getting multiple intersection points through callback function

patch('Faces',T,'Vertices',V,'FaceColor','white','ButtonDownFcn',@MyCallback)
 axis equal; 
pointCo = getappdata(0, 'point');


function MyCallback(src,eventData)
   p = eventData.IntersectionPoint;
   setappdata(0, 'point', p);
end

The goal of the above code is to return the coordinates of the points I clicked on a 3d surface triangular mesh. I am very new callbacks so I hope this is not very hard.

Question 1: The code is functioning if I only care for a triplet of coordinates of one intersection point. How can I return the coordinates of multiple ones (by clicking many times on the mesh and coordinates not overriding each other)?

Question 2: If I want an intersection point that is currently not visible from the viewing angle in the figure created by patch, I need to add cameratoolbar to rotate the mesh. The moment I add cameratoolbar it seems like it stops working.