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* Doxygen documentation added for nglib exported functions.
* Restructured the code for improved readability.
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Philippose Rajan
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nglib/nglib.h
242
nglib/nglib.h
@ -7,10 +7,18 @@
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/* Date: 7. May. 2000 */
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/**************************************************************************/
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/*
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/*!
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\file nglib.h
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\brief Library interface to the netgen meshing kernel
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\author Joachim Schoeberl
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\date 7. May 2000
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Interface to the netgen meshing kernel
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This header file provides access to the core functionality of the Netgen
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Mesher via a library interface, without an interactive User Interface.
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The intention of providing these set of functions is to allow system
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developers to integrate Netgen into top-level code, to act as the low
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level mesh generation / optimisation kernel.
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*/
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// Philippose - 14.02.2009
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@ -26,87 +34,243 @@ Interface to the netgen meshing kernel
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#endif
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// ** Constants used within Netgen *********************
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/// Maximum allowed number of nodes per volume element
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#define NG_VOLUME_ELEMENT_MAXPOINTS 10
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/// Maximum allowed number of nodes per surface element
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#define NG_SURFACE_ELEMENT_MAXPOINTS 6
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// *** Data-types for accessing Netgen functionality ***
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/// Data type for NETGEN mesh
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typedef void * Ng_Mesh;
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/// Data type for NETGEN CSG geomty
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/// Data type for NETGEN CSG geometry
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typedef void * Ng_CSG_Geometry;
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/// Data type for NETGEN 2D geomty
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/// Data type for NETGEN 2D geometry
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typedef void * Ng_Geometry_2D;
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/// Data type for NETGEN STL geomty
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/// Data type for NETGEN STL geometry
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typedef void * Ng_STL_Geometry;
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// max number of nodes per element
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#define NG_VOLUME_ELEMENT_MAXPOINTS 10
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// *** Special Enum types used within Netgen ***********
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/// Currently implemented surface element types
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enum Ng_Surface_Element_Type
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{ NG_TRIG = 1, NG_QUAD = 2, NG_TRIG6 = 3 };
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// implemented element types:
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enum Ng_Volume_Element_Type { NG_TET = 1, NG_PYRAMID = 2, NG_PRISM = 3,
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NG_TET10 = 4 };
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/// Currently implemented volume element types
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enum Ng_Volume_Element_Type
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{ NG_TET = 1, NG_PYRAMID = 2, NG_PRISM = 3, NG_TET10 = 4 };
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// max number of nodes per surface element
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#define NG_SURFACE_ELEMENT_MAXPOINTS 6
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// implemented element types:
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enum Ng_Surface_Element_Type { NG_TRIG = 1, NG_QUAD = 2,
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NG_TRIG6 = 3 };
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/// Values returned by Netgen functions
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enum Ng_Result
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{ NG_OK = 0,
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NG_SURFACE_INPUT_ERROR = 1,
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NG_VOLUME_FAILURE = 2,
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NG_STL_INPUT_ERROR = 3,
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NG_SURFACE_FAILURE = 4,
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NG_FILE_NOT_FOUND = 5
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};
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// *** Classes required for use within Netgen **********
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/// Netgen Meshing Parameters class
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class Ng_Meshing_Parameters
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{
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public:
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public:
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double maxh; //!< Maximum global mesh size limit
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double fineness; //!< Mesh density: 0...1 (0 => coarse; 1 => fine)
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int secondorder; //!< Generate second-order surface and volume elements
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char * meshsize_filename; //!< Optional external mesh size file
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int quad_dominated; //!< Creates a Quad-dominated mesh
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double maxh;
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double fineness; // 0 .. coarse, 1 .. fine
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int secondorder;
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char * meshsize_filename;
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int quad_dominated;
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/*!
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Default constructor for the Mesh Parameters class
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DLL_HEADER Ng_Meshing_Parameters();
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Note: This constructor initialises the variables in the
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class with the following default values
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- #maxh: 1000.0
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- #fineness: 0.5
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- #secondorder: 0.0
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- #meshsize_filename: 0
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- #quad_dominated: 0
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*/
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DLL_HEADER Ng_Meshing_Parameters();
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};
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enum Ng_Result { NG_OK = 0,
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NG_SURFACE_INPUT_ERROR = 1,
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NG_VOLUME_FAILURE = 2,
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NG_STL_INPUT_ERROR = 3,
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NG_SURFACE_FAILURE = 4,
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NG_FILE_NOT_FOUND = 5 };
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// *** Functions Exported by this Library *************
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// General purpose initialisation / destruction functions
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/*! \brief Initialise the Netgen library and prepare for use
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// initialize, deconstruct Netgen library:
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This function needs to be called by the third-party
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program before beginning to use the other Netgen
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specific functions.
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*/
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DLL_HEADER void Ng_Init ();
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/*! \brief Exit the Netgen meshing kernel in a clean manner
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Use this function to exit the meshing sub-system in
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a clean and orderly manner.
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*/
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DLL_HEADER void Ng_Exit ();
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/*! \brief Create a new (and empty) Netgen Mesh Structure
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// Generates new mesh structure
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This function creates a new Netgen Mesh, initialises
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it, and returns a pointer to the created mesh structure.
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Use the returned pointer for subsequent operations
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which involve mesh operations.
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\return Ng_Mesh* Pointer to a Netgen Mesh type #Ng_Mesh
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*/
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DLL_HEADER Ng_Mesh * Ng_NewMesh ();
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/*! \brief Delete an existing Netgen Mesh Structure
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Use this function to delete an existing Netgen mesh
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structure and release the used memory.
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\param mesh Pointer to an existing Netgen Mesh structure
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of type #Ng_Mesh
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*/
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DLL_HEADER void Ng_DeleteMesh (Ng_Mesh * mesh);
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// feeds points, surface elements and volume elements to the mesh
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DLL_HEADER void Ng_AddPoint (Ng_Mesh * mesh, double * x);
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DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et,
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int * pi);
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DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et,
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int * pi);
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// ask for number of points, surface and volume elements
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// Common Mesh related utility functions
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/*! \brief Add a point to a given Netgen Mesh Structure
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This function allows points to be directly added to a Netgen
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mesh structure by providing the co-ordinates.
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Each call to the function allows only one point to be added.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\param x Pointer to an array of type double containing the co-ordinates
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of the point to be added in the form: \n
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- x[0] = X co-ordinate
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- x[1] = Y co-ordinate
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- x[2] = Z co-ordinate
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*/
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DLL_HEADER void Ng_AddPoint (Ng_Mesh * mesh, double * x);
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/*! \brief Add a surface element to a given Netgen Mesh Structure
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This function allows the top-level code to directly add individual
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Surface Elements to a Netgen Mesh Structure by providing the type of
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element to be added and the indices of the points which constitute the
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element.
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<i>Note:</i>
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- The points referred to by the surface elements must have been
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added prior to calling this function.
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- Currently only triangular elements are supported, and the Surface Element
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Type argument is not used.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\param et Surface Element type provided via the enumerated type
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#Ng_Surface_Element_Type
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\param pi Pointer to an array of integers containing the indices of the
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points which constitute the surface element being added
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*/
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DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et, int * pi);
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/*! \brief Add a volume element to a given Netgen Mesh Structure
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This function allows the top-level code to directly add individual
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Volume Elements to a Netgen Mesh Structure by providing the type of
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element to be added and the indices of the points which constitute the
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element.
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<i>Note:</i>
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- The points referred to by the volume elements must have been
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added prior to calling this function.
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- Currently only tetrahedral elements are supported, and the Volume Element
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Type argument is not used.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\param et Volume Element type provided via the enumerated type
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#Ng_Volume_Element_Type
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\param pi Pointer to an array of integers containing the indices of the
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points which constitute the volume element being added
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*/
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DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et, int * pi);
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/*! \brief Returns the Number of Points present in the specified Mesh
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Given an already existent Netgen Mesh Structure, this function
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returns the number of points currently present within the Mesh.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\return
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Integer Data-type with the number of points in the Mesh
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*/
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DLL_HEADER int Ng_GetNP (Ng_Mesh * mesh);
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/*! \brief Returns the Number of Surface Elements present in the specified Mesh
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Given an already existent Netgen Mesh Structure, this function
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returns the number of surface elements currently present within
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the Mesh.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\return
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Integer Data-type with the number of surface elements in the Mesh
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*/
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DLL_HEADER int Ng_GetNSE (Ng_Mesh * mesh);
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/*! \brief Returns the Number of Volume Elements present in the specified Mesh
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Given an already existent Netgen Mesh Structure, this function
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returns the number of volume elements currently present within
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the Mesh.
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\param mesh Pointer to an existing Netgen Mesh structure of
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type #Ng_Mesh
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\return
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Integer Data-type with the number of volume elements in the Mesh
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*/
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DLL_HEADER int Ng_GetNE (Ng_Mesh * mesh);
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// return point coordinates
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// Return the Point Coordinates of a specified Point
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// The x, y and z co-ordinates are returned in the array pointer as
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// x[0] = x ; x[1] = y ; x[2] = z
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DLL_HEADER void Ng_GetPoint (Ng_Mesh * mesh, int num, double * x);
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// return surface and volume element in pi
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DLL_HEADER Ng_Surface_Element_Type
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Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi);
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