/*! \page projection_algos_page Projection Algorithms \n Projection algorithms allow to define the mesh of a geometrical object by the projection of another already meshed geometrical object. Projection 1D algorithm allows to define the mesh of an edge (or group of edges) by the projection of another already meshed edge (or group of edges). \n To apply this algorithm select the edge to be meshed (indicated in the field \b Geometry of Create mesh dialog box), Projection1D in the list of 1D algorithms and click the "Add Hypothesis" button. The following dialog box will appear: \image html projection_1d.png In this menu you can define the \b Name of the algorithm, the already meshed source \b Edge and the \b Mesh (optional, use it if there are several different meshes on the same edge). It could also be necessary to define the orientation of edges, which is done by indicating the Source Vertex being the first point of the Source Edge and the Target Vertex being the first point of the created \b Edge. For a group of edges, Source and Target vertices should be shared by only one edge of the group. If Source and Target vertices are specified, the elements of the group must be ajacent. \n Projection 2D algorithm allows to define the mesh of a face (or group of faces) by the projection of another already meshed face (or group of faces). This algorithm works only if all edges of the target face have been meshed as 1D Projections of the edges of the source face. To apply this algorithm select the face to be meshed (indicated in the field \b Geometry of Create mesh dialog box), Projection 2D in the list of 2D algorithms and click the "Add Hypothesis" button. The following dialog box will appear: \image html projection_2d.png In this menu you can define the \b Name of the algorithm, the already meshed source \b Face and the \b Mesh (optional, use it if there are several different meshes on the same face). It could also be necessary to define the orientation of mesh on the face, which is done by indicating two Source Vertices, which belong to the same edge of the source face, and two Target Vertices, which belong to the same edge of the created \b Face. \n Projection 3D algorithm allows to define the mesh of a shape by the projection of another already meshed shape. This algorithm works only if all faces and edges of the target face have been meshed as 1D Projections of the faces and edges of the source face. Another limitation is that this algorithm currently works only on boxes. To apply this algorithm select the solid to be meshed (indicated in the field \b Geometry of Create mesh dialog box), Projection 3D in the list of 3D algorithms and click the button. The following dialog box will appear: \image html projection_3d.png In this menu you can define the \b Name of the algorithm, the already meshed source 3D shape and the \b Mesh (optional, use it if there are several different meshes on the same shape). It could also be necessary to define the orientation of mesh on the shape, which is done by indicating two Source Vertices, which belong to the same edge of the source 3D Shape, and two Target Vertices, which belong to the same edge of the source 3D Shape. */