Problem with Camera view and projection depth

Hi, I am currently working on a project to create a view from different points of an object from its surface normal at that point and check whether another object is visible to that particular point. my code is as follow:

daspect([1 1 1]);
camproj perspective;
camva('auto');
set(gca,'renderer','zbuffer');
for i = 1:sizez(origin)
campos(origin(i,:)+0.01*direction(i,:));
camview(origin(i,:)+10*direction(i,:));
end

The results appear to be acceptable in most of the case; but some case would give me a result like this: <http://img228.imageshack.us/img228/9449/test11f1rsign.png>

I believe the problem is due to the aspect ratio. but when i set it to auto, the view is even worse. I dont want to adjust the aspect ratio one by one and I believe that must be a way out.

Any suggestion for that?

Thanks in advance.

Regards, Augustine Lee