Dot path in a 3d Surface plot

Good morning, i plotted a surface with the following script: p00 = 10.08; p10 = -0.3684; p01 = 0.7184; p20 = -0.08948 ; p11 = 0.2135 ; p02 = -0.06468 ; p30 = -0.004133 ; p21 = 0.009307 ; p12 = -0.008105 ; p03 = 0.002058 ; phi= (5:2:31); a= (12.5:2.5:42.50); [x,y]= meshgrid(phi,a); axis ([0,30,0,45,0,70])

ok=ones(81);

z = p00+ p10*x+ p01*y + p20 * (x.^2) + (x.*y.* p11)+ p02*(y.^2) + p30*(x.^3) + ((x.^2).*y)* p21 + p12*(x.*(y.^2)) + p03*(y.^3); surf (x,y,z)

Now i need to plot, in the same window, a dot moving between 5 points. I have 3 vectors representing the intermidiate position of the dot: M= [13,15,11,10,9,13]; N = [23,21,22,24,26,22]; O = [35,38,29,28,30,32]; So the point is to see the dot mooving from (13,23,35) to (13,22,32) passing from the other three points. Thanks