3D plot – Part 3In this part, we demonstrate the use of the function 'sphere'. We are going to draw a unit sphere centered at the origin and generated by matrices x, y and z, of size 31 x 31 each. Just as an excercise, we also add a line going from the center of the sphere to one of the corners in the figure (within the 3D plot). Example: % cleans the workspace clc; clear; close all % returns the coordinates of a sphere in three % matrices that are (n+1)-by-(n+1) in size [x, y, z] = sphere(30); plot3(x,y,z) % keeps the proportions in place and writes appropriate info. axis('square') title('Transparent Sphere') xlabel('x axis') ylabel('y axis') zlabel('z axis') % keeps the above sphere in order to superimpose a line hold on % the line goes from (-1, 1, 1) to (0, 0, 0) a = -1 : .1 : 0; b = 1 : -.1 : 0; c = b; plot3(a, b, c) % draws the sphere in another format and in another figure % see what happens if we don't use the axis('square') instruction figure mesh(x,y,z) hold on plot3(a, b, c) And the resulting figures are:   From '3D Plot Part 3' to home From '3D Plot Part 3' to 3D Main
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