Plotting Trajectory in 3D From User Input

Hi! I'm trying to plot a trajectory on a globe (that I have already built) using an input window. The code for that is below.

prompt = {'Enter start x-coordinate (ECF).',...
                  'Enter start y-coordinate (ECF).',...
                  'Enter start z-coordinate (ECF).',...
                  'Enter end x-coordinate (ECF).',...
                  'Enter end y-coordinate (ECF).',...
                  'Enter end z-coordinate (ECF).'};
        dlgtitle = 'Custom Trajectory';
        dims = [1 35];
        definput = {'4.89e6','-4.27e4','4.08e6',...
                    '5.11e6','1.53e6','4.69e6'};
        answer = inputdlg(prompt,dlgtitle,dims,definput);

As you can see, there are values for the starting point and ending point that the user can input. Of course, I want the entire trajectory. Is there any way to increment between the starting and ending points and plot them from a window like this? I hope I explained this well enough. Thank you!

[darova]

What if point are not on the sphere?

S = str2double(answer(1:3));
E = str2double(answer(4:6));
[X,Y,Z]= sphere();
R = norm(S);
surf(R*X,R*Y,R*Z,'EdgeColor','none')
hold on
plot3([S(1) E(1)], [S(2) E(2)], [S(3) E(3)],'.-b')
hold off
axis equal