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		FaceCirculator fc(f);
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		FaceCirculator fc(f);
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		int k;
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		int k;
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		// M is a matrix that projects a vector onto the orthogonal
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		// M is a matrix that projects a vector onto the orthogonal
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		// complement of the face normal
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		// complement of the face normal
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		Mat3x3f M;
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		Vec3f n = get_normal(f);
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		Vec3f n = get_normal(f);
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		Vec3f a,b;
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		outer_product(n,n,M);
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		orthogonal(n, a, b);
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		M = identity_Mat3x3f() - M;
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		Mat3x3f M(a,b,n);
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		// Get all projected vertices
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		// Get all projected vertices
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		vector<Vec2f> v;
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		vector<Vec2f> v;
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		for(k=0;!fc.end();++fc,++k)
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		for(k=0;!fc.end();++fc,++k)
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			{
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			{