Page 184 - Basics of MATLAB and Beyond

colouring of the sphere itself. To show this more clearly, use the flag
colour map:

colormap(flag)

The flag colouring underlies the colour from the lights. To see the lights
reflecting from a white sphere, set the colour of the surface to white.
You could issue the statement colormap([1 1 1]), but the following
achieves the same result:

h = findobj(’type’,’surface’);
set(h,’facecolor’,’w’)

So far, we have been using the default “flat” method of rendering lit
objects: each facet is a constant colour. But there are other ways. Let
us generate a gray surface to work on:

clf
peaks(20),axis off
h = findobj(’type’,’surface’);
set(h,’FaceColor’,[.5 .5 .5 ],...
’edgecolor’,[.5 .5 .5])

Generate a few lights:
x = [-3-3 3];
y = [-33 -3];
z=[8 8 8];

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