Matlab读取ply文件,polydata
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PLY_IO
Read or Write a PLY File
PLY_IO is a MATLAB library which reads or writes data describing a polygonal mesh in a PLY file.
A PLY file contains a sophisticated data structure describing a polygonal surface. A triangulated mesh is a very simply case of such a surface; a PLY file can also describe a mesh surface involving higher order polygons, and it can contain auxilliary information about normal vectors and so on.
A TRI_MESH or triangulated mesh surface, is described by a pair of arrays:
- a node coordinate array containing the coordinates of nodes;
- a triangle node array containing triples of the indices of the nodes used to form each triangle;
Licensing:
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
Languages:
PLY_IO is available in a C version and a MATLAB version,
Related Data and Programs:
BEZIER_SURFACE_DISPLAY, a MATLAB program which reads two files defining a Bezier surface and displays it.
FEM_BASIS_T3_DISPLAY, a MATLAB program which displays a basis function associated with a linear triangle ("T3") mesh.
FEM_BASIS_T6_DISPLAY, a MATLAB program which reads a quadratic triangle mesh and displays any associated basis function.
OBJ_TO_PLY, a C program which converts an Wavefront OBJ file to PLY format.
PLATO_PLY, a C program which creates a Platonic solid and writes it to an ASCII PLY file, by Greg Turk.
PLY, a data directory which contains a description and examples of PLY files.
PLY_DISPLAY, a MATLAB program which displays an image of a 3D graphics file in PLY format;
PLY_TO_IV, a C program which converts a PLY file to INVENTOR format.
PLY_TO_OBJ, a C program which reads a PLY 3D graphics file and writes an equivalent OBJ graphics file.
POLYGONAL_SURFACE, a data directory which contains examples of polygonal surface files.
STLA_DISPLAY, a MATLAB program which reads an ASCII STL file and displays it.
TRIANGULATION_DISPLAY_OPENGL, a C++ program which reads files defining a triangulation and displays an image using OpenGL.
Author:
The original versions of the files PLY_READ.M. PLY_WRITE.M and PLY_TO_TRI_MESH.M were created by Pascal Getreuer.
Source Code:
- i4mat_transpose_print_some.m, prints some of the transpose of an I4MAT.
- ply_read.m reads a PLY file.
- ply_write.m writes a PLY file.
- ply_to_tri_mesh.m converts PLY data to TRI_MESH data.
- r8mat_transpose_print_some.m, prints some of the transpose of an R8MAT.
- s_len_trim.m returns the length of a string to the last nonblank.
- timestamp.m prints the current YMDHMS date as a time stamp.
- tri_mesh_to_ply.m converts TRI_MESH data to PLY data.
Examples and Tests:
- ply_io_test.m runs all the tests.
- ply_io_test_output.txt the output file.
- ply_io_test01.m converts data defining a pyramid as a triangular mesh into a PLY data structure, and used PLY_WRITE to write it to a file.
- ply_io_test02.m reads a PLY file defining a sphere, extracts the data, and displays it.
- pyramid.ply the PLY file defining a pyramid.
- pyramid.png a PNG image of MATLAB's display of the pyramid.
- sphere.ply the PLY file defining a sphere.
- sphere.png a PNG image of MATLAB's display of the sphere.
You can go up one level to the MATLAB source codes.
Last revised on 25 June 2007.
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