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

Implementation4.5. Implementation of SoBaseGridSoStructuredGrid3D NodesSoStructuredGrid (continued) SoBaseGrid → SoNode → . . .SoStructuredGrid3D A 3D grid, that can be stored in a three dimensional array, where the index in thearray implies its topological attributes.SoCurvilinearGrid3D One cell consists of 8 vertices. One face consists of 4 vertices. The faces mustnot be planar. In a regular case no cell intersects the another cell (see figure 5.18on page 114). This is one of the most important grids for CFD data sets.SoRectangularGrid3D One cell consists of 8 vertices. One face consists of 4 vertices. Each face isorthogonal to its aligned faces. This grid is mostly used for medical data sets likeCT and MR data sets. This grid is a specialization of the SoVoxelGrid.SoRegularSpacedRectangularGrid3D All cells have the same size in the three principle directions (see figure 4.16page 90).SoIrregularSpacedRectangularGrid3D The cells may have different size in the three principle directions.SoCylindricGrid3D This grid defines the well known cylinder coordinates in 3D. Figure 4.17 onpage 90 shows a visualization of a 3D cylindrical grid.SoRegularSpacedCylindricalGrid3D All cells have the same angular increment and the same height. The radius incrementis constant too.SoIrregularSpacedCylindricalGrid3D The angular increment may differ as well as the height increment and the radius.SoSphericalGrid3D This grid is used for spherical coordinates in 3D (see figure 4.18 on page 90).SoRegularSpacedSphericalGrid3D The angular azimuth increment, the angular altitude increment and the radiusincrement are constant.SoIrregularSpacedSphericalGrid3D The angular azimuth increment, the angular altitude increment and the radiusincrement are variable.87