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import three;
currentlight=Viewport;
size(10cm);
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)}}));
s.s[0].colors=new pen[] {red,green,blue,black};
draw(s,nolight);
surface t=shift(Z)*unitplane;
t.s[0].colors=new pen[] {red,green,blue,black};
draw(t,nolight);
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