Name
surf — Display 3-D color surface wih lighting
Calling Sequence
hdl = surf(X,Y,Z)
Parameter
- X
1 by n matrix or n by n matrix
- Y
1 by n matrix or n by n matrix
- Z
n by n matrix
- hdl
Handle of the created Fac3d entity
Description
surfl(x,y,Z) plots the colored parametric or non parametric surface defined by three arguments. The view point is specified by the 'view' property (see below), the light by the 'light' property.
The default location of the light source is the point [1 1 1].
x=linspace(-1,1,20); y=linspace(-2,2,40); Z=cos(y'*x); surfl(x,y,Z); surfl(x,y,Z,'axis','off','shading','interp');
Note that surf(Z) uses x = 1:n and y = 1:m. When f is a function/macro and x,y are vectors, surf(x,y,f) plots the parametric or non parametric surface defined by f :
if Z has the syntax z=f(x,y) then surfl(x,y,f) plots a non parametric surface,
if Z has the syntax [x,y,z]=f(u,v), then surfl(u,v,f) plots a parametric surface,
Examples
u=linspace(0,2*%pi,50);
v=linspace(0,%pi,25);
deff('[x,y,z]=sphere(u,v)',['x=sin(v).*cos(u)';...
'y=sin(v).*sin(u)';...
'z=cos(v)']);
colormap green
subplot 121;
surfl(u,v,sphere,'shading','interp','axis','equal');
subplot 122;
surfl(u,v,sphere,'shading','interp','axis','equal','light',[0 0 1]);