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			double delta_energy(HalfEdgeIter he) const
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			double delta_energy(HalfEdgeIter he) const
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			{
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			{
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				FaceIter f = he->face;
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				FaceIter f = he->face;
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				FaceIter f2 = he->opp->face;
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				FaceIter f2 = he->opp->face;
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				double t = dot(normal(f), normal(f2));
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				double t = dot(normal(f), normal(f2));
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				if(t> thresh || t < -thresh)
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				if(t> thresh)
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					{
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					{
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						Vec3d v0(he->vert->pos);
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						Vec3d v0(he->vert->pos);
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						Vec3d v1(he->next->vert->pos);
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						Vec3d v1(he->next->vert->pos);
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						Vec3d v2(he->opp->vert->pos);
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						Vec3d v2(he->opp->vert->pos);
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						Vec3d v3(he->opp->next->vert->pos);
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						Vec3d v3(he->opp->next->vert->pos);