文件列表:

Mesh_voxelisation\READ_stl.m (9708, 2010-11-26)
Mesh_voxelisation\sample.stl (121489, 2009-09-15)
Mesh_voxelisation\STLvoxelisation.png (113358, 2010-05-25)
Mesh_voxelisation\VOXELISE.m (28104, 2010-12-02)
Mesh_voxelisation\VOXELISE_example.m (789, 2010-06-23)
Mesh_voxelisation (0, 2010-12-29)

Polygon mesh voxelisation ========================= Adam H. Aitkenhead adam.aitkenhead@physics.cr.man.ac.uk The Christie NHS Foundation Trust 14th May 2010 Voxelise a closed (ie. watertight) triangular-polygon mesh. The mesh can be in one of several formats: in an STL file; in a structure containing the faces and vertices data; in three 3xN arrays containing the x,y,z coordinates; or in a single Nx3x3 array defining the vertex coordinates for each of the N facets. USAGE: ====== [gridOUTPUT,gridCOx,gridCOy,gridCOz] = VOXELISE(gridX,gridY,gridZ,STLin,raydirection) ...or... [gridOUTPUT,gridCOx,gridCOy,gridCOz] = VOXELISE(gridX,gridY,gridZ,meshFV,raydirection) ...or... [gridOUTPUT,gridCOx,gridCOy,gridCOz] = VOXELISE(gridX,gridY,gridZ,meshX,meshY,meshZ,raydirection) ...or... [gridOUTPUT,gridCOx,gridCOy,gridCOz] = VOXELISE(gridX,gridY,gridZ,meshXYZ,raydirection) INPUT PARAMETERS ================ gridX - Mandatory - 1xP array - List of the grid X coordinates. OR an integer - Number of voxels in the grid in the X direction. gridY - Mandatory - 1xQ array - List of the grid Y coordinates. OR an integer - Number of voxels in the grid in the Y direction. gridZ - Mandatory - 1xR array - List of the grid Z coordinates. OR an integer - Number of voxels in the grid in the Z direction. STLin - Optional - string - Filename of the STL file. meshFV - Optional - structure - Structure containing the faces and vertices of the mesh, in the same format as that produced by the isosurface command. meshX - Optional - 3xN array - List of the mesh X coordinates for the 3 vertices of each of the N facets meshY - Optional - 3xN array - List of the mesh Y coordinates for the 3 vertices of each of the N facets meshZ - Optional - 3xN array - List of the mesh Z coordinates for the 3 vertices of each of the N facets meshXYZ - Optional - Nx3x3 array - The vertex positions for each facet, with: 1 row for each facet 3 columns for the x,y,z coordinates 3 pages for the three vertices raydirection - Optional - String - Defines in which directions the ray-tracing is performed. The default is 'xyz', which traces in the x,y,z directions and combines the results. OUTPUT PARAMETERS ================= gridOUTPUT - Mandatory - PxQxR logical array - Voxelised data (1=>Inside the mesh, 0=>Outside the mesh) gridCOx - Optional - 1xP array - List of the grid X coordinates. gridCOy - Optional - 1xQ array - List of the grid Y coordinates. gridCOz - Optional - 1xR array - List of the grid Z coordinates. EXAMPLES ======== To voxelise an STL file: >> [gridOUTPUT] = VOXELISE(gridX,gridY,gridZ,STLin) To voxelise a mesh defined by a structure containing the faces and vertices: >> [gridOUTPUT] = VOXELISE(gridX,gridY,gridZ,meshFV) To voxelise a mesh where the x,y,z coordinates are defined by three 3xN arrays: >> [gridOUTPUT] = VOXELISE(gridX,gridY,gridZ,meshX,meshY,meshZ) To voxelise a mesh defined by a single Nx3x3 array: >> [gridOUTPUT] = VOXELISE(gridX,gridY,gridZ,meshXYZ) To also output the lists of X,Y,Z coordinates: >> [gridOUTPUT,gridCOx,gridCOy,gridCOz] = VOXELISE(gridX,gridY,gridZ,STLin) To use ray-tracing in only the z-direction: >> [gridOUTPUT] = VOXELISE(gridX,gridY,gridZ,STLin,'z') NOTES ===== - Defining raydirection='xyz' means that the mesh is ray-traced in each of the x,y,z directions, with the overall result being a combination of the result from each direction. This gives the most reliable result at the expense of computation time. - Tracing in only one direction (eg. raydirection='z') is faster, but can potentially lead to minor errors if rays exactly cross a facet edge. REFERENCES ========== - This code uses a ray intersection method similar to that described by: Patil S and Ravi B. Voxel-based representation, display and thickness analysis of intricate shapes. Ninth International Conference on Computer Aided Design and Computer Graphics (CAD/CG 2005)

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