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| template<typename DerivedV , typename DerivedF , typename DeriveddblA >  | 
| void  | igl::doublearea (const Eigen::MatrixBase< DerivedV > &V, const Eigen::MatrixBase< DerivedF > &F, Eigen::PlainObjectBase< DeriveddblA > &dblA) | 
|   | Computes twice the area for each input triangle or quad.  
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| template<typename DerivedA , typename DerivedB , typename DerivedC , typename DerivedD >  | 
| void  | igl::doublearea (const Eigen::MatrixBase< DerivedA > &A, const Eigen::MatrixBase< DerivedB > &B, const Eigen::MatrixBase< DerivedC > &C, Eigen::PlainObjectBase< DerivedD > &D) | 
|   | Compute the twice the signed area of a each triangle.  
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| template<typename DerivedA , typename DerivedB , typename DerivedC >  | 
| DerivedA::Scalar  | igl::doublearea_single (const Eigen::MatrixBase< DerivedA > &A, const Eigen::MatrixBase< DerivedB > &B, const Eigen::MatrixBase< DerivedC > &C) | 
|   | Compute the twice the signed area of a single triangle.  
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| template<typename Derivedl , typename DeriveddblA >  | 
| void  | igl::doublearea (const Eigen::MatrixBase< Derivedl > &l, const typename Derivedl::Scalar nan_replacement, Eigen::PlainObjectBase< DeriveddblA > &dblA) | 
|   | Compute twice the area of each intrinsic triangle in a mesh.  
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| template<typename Derivedl , typename DeriveddblA >  | 
| void  | igl::doublearea (const Eigen::MatrixBase< Derivedl > &l, Eigen::PlainObjectBase< DeriveddblA > &dblA) | 
|   | This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.  
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| template<typename DerivedV , typename DerivedF , typename DeriveddblA >  | 
| void  | igl::doublearea_quad (const Eigen::MatrixBase< DerivedV > &V, const Eigen::MatrixBase< DerivedF > &F, Eigen::PlainObjectBase< DeriveddblA > &dblA) | 
|   | Computes twice the area for each input quadrilateral.  
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