/*! \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 dialog you can define
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 edges in the group must be connected. The source and target groups must contain equal number of edges and they must form topologically equal structures. \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 discretized into the same number of segments as corresponding 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 dialog you can define The groups of faces are suitable for this algorithm only if they contain an equal number of faces and form topologically equal structures. \n Projection 1D-2D algorithm differs from Projection 2D algorithm in one aspect: it generates mesh segments on edges of the face according to the projected 2D elements; thus it does not require the edges to be meshed by any other 1D algorithm; moreover it does not allow to mesh edges of the face using another algorithm via definition of sub-meshes. \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 shape have been meshed as 1D-2D Projections of the faces and edges of the source shape. 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 (It can be omitted only when projecting a submesh on another one from the same global Mesh). 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.
See Also a sample TUI Script of a \ref tui_projection "Projection Algorithms". */