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material dullThe default is material default.The material <strong>and</strong> lighting comm<strong>and</strong>s are simple interfaces forchanging the h<strong>and</strong>le graphics properties that affect lighting. See theUsing <strong>MATLAB</strong> Graphics manual for more details. For now, we illustratesome <strong>of</strong> the fine tuning effects that you can achieve. Here is thematlab logo, produced using the membrane function <strong>and</strong> illuminated:clfmembraneh = light(’pos’,[-.5 .5 .1]);pltlightaxis <strong>of</strong>fThe flat region near the light is a constant colour. That is because, bydefault, the light rays are parallel to the line joining the position <strong>of</strong> thelight <strong>and</strong> the centre <strong>of</strong> the plot. To simulate a point source <strong>of</strong> light atthe position <strong>of</strong> the light, set the style property <strong>of</strong> the light to local:set(h,’style’,’local’)As another example, the following uses various reflectance properties<strong>of</strong> the (slightly roughened) sphere, along with a light <strong>of</strong>f to one side, toproduce a simulated crescent moon (see moon.m in companion s<strong>of</strong>tware).First the spherical data points are r<strong>and</strong>omized to produce a slightlyrough sphere:[x,y,z] = sphere(100);N = size(x,1);x = x + r<strong>and</strong>n(N)/1000;y = y + r<strong>and</strong>n(N)/1000;z = z + r<strong>and</strong>n(N)/1000;c○ 2000 by CRC Press LLC
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