CashFlow, A Visualization Framework for 3D Flow - Studierstube ...

Implementation4.5. Implementation of SoBaseGridSoUnstructuredGrid NodesSoBaseGrid SoNode → . . .SoUnstructuredGrid Any grid that can not be stored in an n–dimensional array, where the index in thearray defines its topology is a SoUnstructuredGrid. Vertices are stored in one list.The geometric primitives such as triangle, quads etc. are defined as index listsrepresenting the topology of the grid.SoUnstructuredGrid2D 2D grids, that can not be stored in a two dimensional array, where the index inthe array defines its topology.SoTriangleGrid2D A grid consisting of many connected triangles.SoQuadGrid2D A grid consisting of many connected quads. A quad is a closed polygon with 4vertices.SoUnstructuredGrid3D Any grid, that can not be stored in a three-dimensional array, where the indexof the array implies the topology information is a unstructured grid. These gridsoften use a list of vertices and a list of faces build by the vertices (compare toSoIndexedFaceSet in Coin3D[Coi00]).SoTetrahedralGrid3D Grid consists of closed cells with 4 vertices per cell and 4 faces (see figure 4.15on page 89).SoVoxelGrid3D Grid containing of closed cells with 8 vertices per cell and 6 faces. The faces ofa cell must not be orthogonal to each other (see figure 4.16 on page 90).SoHybridGrid3D Grid containing of closed cells with variable number of vertices per cell and face.This is a combination of different grids.88