% MATLAB Lecture 5 Wednesday 16 November 2005
% 1. Spheres and Cylinders
[x,y,z] = sphere(10);
size(x)

ans =

    11    11

mesh(x,y,z)
[x,y,z] = sphere(100);
mesh(x,y,z)
% another sampling primitive is cylinder:
[x,y,z] = cylinder(30);
mesh(x,y,z)
% cones can be made using the cylinder:
[x,y,z] = cylinder([1 0]);
mesh(x,y,z)
% The argument of cylinder is the
% radius of the cylinder.
t = 0:0.01:1; % sampling range
r = cos(t); % cosine as radius
cylinder(r)
% we made a cylinder whose walls
% are defined by the cosine
% With cylinder we can make any
% so-called surface of revolution.
% 2. Splines
% Splines are used in computer aided design
% In making a more complicated plot,
edit
% we better store the instructions in an m-file.
cd h:
help car
  shows the profile of a car



car
fschange('H:\car.m');
car
% 3. Three dimensional modeling
edit
clear('H:\polyhedron.m');
polyhedron
edit
fschange('H:\polytope.m');
polytope

f =

     1     2     6
     1     6     3
     1     4     6
     1     6     5

diary off