TRI_MESH
Pairs of Files Defining a 3D Triangulated Surface

These are some examples of TRI_MESH data, defining a surface in 3D, using a mesh of triangles. The format requires two files:

• the node file lists the 3D coordinates of a set of points.
• the triangle file lists triples of node indices, forming triangles.

Related Data and Programs:

POLYGONAL_SURFACE is a data directory which contains examples of polygonal surface files.

TABLE is the format used for both the node and triangle files.

TRI_MESH_DISPLAY is an executable MATLAB program which reads files defining a triangulated surface and displays an image.

TRIANGULATION_ORDER3 is a format using a pair of files to define a triangulation in 2D.

Programs to display a TRI_MESH

• TRI_MESH_DISPLAY is an executable MATLAB program which reads files defining a triangulated surface and displays an image.

Programs to convert a TRI_MESH to another format:

• TRI_MESH_TO_PLY is a MATLAB program which converts a TRI_MESH data structure into a PLY data structure.

Programs to convert a file to TRI_MESH format:

• PLY_TO_TRI_MESH is a MATLAB program which can read a PLY file, extract the polygonal surface information, and return it as a TRI_MESH dataset.

Sample Files:

SPHERE is the surface of a sphere.

• sphere_nodes.txt, the coordinates of nodes;
• sphere_triangles.txt, the triangles formed from the nodes;
• sphere.png, a PNG image of the surface.

TETRAHEDRON is the surface of a tetrahedron.

• tetrahedron_nodes.txt, the coordinates of nodes;
• tetrahedron_triangles.txt, the triangles formed from the nodes;
• tetrahedron.png, a PNG image of the surface.

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