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import three;
size(10cm);
currentlight=Headlamp;
surface s=surface(patch(new triple[][] {
{(0,0,0),(1,0,0),(1,0,0),(2,0,0)},
{(0,1,0),(1,0,1),(1,0,1),(2,1,0)},
{(0,1,0),(1,0,-1),(1,0,-1),(2,1,0)},
{(0,2,0),(1,2,0),(1,2,0),(2,2,0)}}));
draw(s,yellow);
draw(s.s[0].vequals(0.5),squarecap+2bp+blue,currentlight);
draw(s.s[0].uequals(0.5),squarecap+2bp+red,currentlight);
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