Trouble using campos and camtarget to navigate a 3D figure

I'm working on a project visualizing 3D maps of biological systems. I'm trying to create a video where the camera travels through the hollow channel of a tubular system. I have a 3D surface rendering and a list of 475 coordinates defining a path within the largest of the curved tubes.

The path should follow the large U-shaped tube in the image below, going in the right entrance, circling around, and coming out of the left entrance:

I have tried using campos and camtarget to iterate through the coordinates, setting the view to a coordinate from the variable xypos, and the camera target as the next point in the list.

uiopen('practice_campos_scatter.fig',1);
camva('manual');campos('manual');camtarget('manual')
load('campos_coords.mat','xypos');
for b=1:size(xypos,1)-1
    campos(xypos(b,:))
    camtarget(xypos(b+1,:))
    drawnow
    disp([b size(xypos,1)])
end

The result is very strange looking (often showing a completely blank figure or a figure with one point). I would appreciate any help!

note: the surface rendering is a very large file that is slow to manipulate on some computers, so I have uploaded instead a scatter3 fig file consisting of a subsampling of the coordinates of the surface: