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How to view things in a given plane in Matlab?

I haven't found a way to see things that I plot with plot3 inside a particular plane. For example, I would like to see the projection of all my objects inside a 2-D view, corresponding to the plane x+y+z=1. Is there any command to do that?

Solution

  • You can achieve this using the view command, passing in the normal vector to your plane:

    view([1,1,1])

    In this case (as explained here) we can take the normal vector from the coefficients [a,b,c] of the equation 

    ax + by + cz = d

    Example when plotting the plane itself:

    [x y] = meshgrid(0:0.1:1);
z = 1 - x - y;
surf(x,y,z)

view([1,1,1]); % <-- key line

xlabel('x'); ylabel('y'); zlabel('z');

    plot

    Moreover, we can plot the normal line which will be invisible from this view as you are looking directly along it! 

    hold on
plot3( [0 1], [0 1], [-1 1], 'r' )