netgen/libsrc/meshing/bcfunctions.hpp

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#ifndef FILE_BCFUNCTIONS
#define FILE_BCFUNCTIONS
// Philippose - 14/03/2009
// Auxiliary functions for OCC Geometry
// Use this file and the corresponding ".cpp"
// file to add miscellaneous functionality
// to the OpenCascade Geometry support in Netgen
namespace netgen
{
/*! \brief Automatically assign boundary conditions for meshes
This function allows the boundary condition numbers of a
mesh created in Netgen to be automatically assigned based on
the colours of each face.
Currently, two algorithms are utilised to assign the BC Properties:
1. Automatic assignment using a user defined colour profile file
which defines which RGB colours are to be assigned to which
BC Property number
- A default profile file exists in the Netgen folder called
"netgen.ocf"
2. The second algorithm uses the following automated algorithm:
- Extract all the colours present in the mesh
- Use colour index 0 (zero) for all faces with no colour defined
- Calculate the number of faces of the surface mesh for each colour
- Sort the number of surface elements in ascending order, with the
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colour indices as a index
- Use the indices of the sorted array as the BC property number
Example: If there are 3 colours, present in the mesh and the number
of surface elements for each colour are:
- Colour 0: 8500
- Colour 1: 120
- Colour 2: 2200
- Colour 3: 575
The above is sorted in ascending order and assigned as BC Properties:
- BC Prop 0: 120 : Colour 1
- BC Prop 1: 575 : Colour 3
- BC Prop 2: 2200 : Colour 2
- BC Prop 3: 8500 : Colour 0 (no colour defined)
*/
//extern void OCCAutoColourBcProps(Mesh & mesh, OCCGeometry & occgeometry, const char *occcolourfile);
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extern DLL_HEADER void AutoColourBcProps(Mesh & mesh, const char *bccolourfile);
extern DLL_HEADER void GetFaceColours(Mesh & mesh, NgArray<Vec<4>> & face_colours);
extern DLL_HEADER bool ColourMatch(Vec<4> col1, Vec<4> col2, double eps = 2.5e-05);
}
#endif