Question

I want to add a “Pointer” to a 3-D plot.
I want this “pointer” to point at a certain spot on a sphere that I have drawn.
This pointer does not have to have an arrowhead but would be nice if it did.

Thanks for any help!

Answer 1

Plain copy from The MathWorks documentation. For further details have a look at this.

% Create a sphere and color it using a topographic colormap:
cla reset;
load topo;
[x y z] = sphere(45);
s = surface(x,y,z,'FaceColor','texturemap','CData',topo);
colormap(topomap1);
% Brighten the colormap for better annotation visibility:
brighten(.6)
% Create and arrange the camera and lighting for better visibility:
campos([2 13 10]);
camlight;
lighting gouraud;
axis off vis3d;
% Set the x- and y-coordinates of the textarrow object:
x = [0.7698 0.5851];
y = [0.3593 0.5492];
% Create the textarrow object: 
txtar =  annotation('textarrow',x,y,'String','We are here.','FontSize',14);