Problem with AVI - 3D point animation

I am trying to create an animation of target and UAV in 3D plot in MATLAB and the following is a part of the code responsible for the animation. x_t, y_t, h_t are the coordinates of the target and x_a,y_a,h_uav are those of the UAV.

figure(1);
set(gcf,'Renderer','OpenGL'); 
h = plot3(x_t(1),y_t(1),h_t(1),'o','MarkerSize',7,'MarkerFaceColor','b');
hold on
h1 = plot3(x_a(1),y_a(1),h_uav(1),'o','MarkerSize',7,'MarkerFaceColor','r');
set(h,'EraseMode','normal');
set(h1,'EraseMode','normal');

i = 1;

while i<=length(x_t)
 set(h,'XData',x_t(i),'YData',y_t(i),'ZData',h_t(i));
 hold on
 set(h1,'XData',x_a(i),'YData',y_a(i),'ZData',h_uav(i));
 axis([0 1500 0 1500]);
 drawnow;
 M(i) = getframe;
 i = i+1;
end

movie2avi(M, 'trial.avi', 'compression', 'none');

The animation seems to a bit jerky. Any tips to improve that? Also you can find that I create an AVI file in the last line of the snippet above. When I open the avi file only the first frame of the animation is displayed for the entire time. What is wrong with that?