TRI_SURFACE
Pairs of Files Defining a 3D Triangulated Surface

These are some examples of TRI_SURFACE 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.

Programs to read or write a TRI_SURFACE file

• TRI_SURFACE_IO is a MATLAB library which reads or writes TRI_SURFACE files.

Programs to display a TRI_SURFACE file

• TRI_SURFACE_DISPLAY is a MATLAB program which reads TRI_SURFACE files and displays a 3D image.

Programs to convert a TRI_SURFACE to another format:

• TRI_SURFACE_TO_PLY is a MATLAB program which converts a TRI_SURFACE file into a PLY file.
• TRI_SURFACE_TO_STLA, a MATLAB program which reads a TRI_SURFACE dataset and extracts the surface mesh data as an ASCII STL file.

Programs to convert a file to TRI_SURFACE format:

• PLY_TO_TRI_SURFACE is a MATLAB program which reads a PLY file and writes a corresponding TRI_SURFACE file.
• STLA_TO_TRI_SURFACE is a MATLAB program which reads an STLA file and writes a corresponding TRI_SURFACE file.

Sample Files:

CESSNA is the surface of a Cessna airplane.

• cessna_nodes.txt, the 3D coordinates of 3745 nodes;
• cessna_triangles.txt, the 7446 triangles formed from the nodes;
• cessna.png, a PNG image of the surface.

CUBE is the surface of a cube.

• cube_nodes.txt, the 3D coordinates of 8 nodes;
• cube_triangles.txt, the 12 triangles formed from the nodes;
• cube.png, a PNG image of the surface.

HUMANOID is the surface of a humanoid shape.

• humanoid_nodes.txt, the 3D coordinates of 64 nodes;
• humanoid_triangles.txt, the 96 triangles formed from the nodes;
• humanoid.png, a PNG image of the surface.

MAGNOLIA is the surface of a magnolia blossom.

• magnolia_nodes.txt, the 3D coordinates of 3741 nodes;
• magnolia_triangles.txt, the 1247 triangles formed from the nodes;
• magnolia.png, a PNG image of the surface.

SHARK is the surface of a shark.

• shark_nodes.txt, the 3D coordinates of 2560 nodes;
• shark_triangles.txt, the 5116 triangles formed from the nodes;
• shark.png, a PNG image of the surface.

SHUTTLE is the surface of a space shuttle.

• shuttle_nodes.txt, the 3D coordinates of 310 nodes;
• shuttle_triangles.txt, the 616 triangles formed from the nodes;
• shuttle.png, a PNG image of the surface.

SPHERE is the surface of a sphere.

• sphere_nodes.txt, the 3D coordinates of 58 nodes;
• sphere_triangles.txt, the 112 triangles formed from the nodes;
• sphere.png, a PNG image of the surface.

TEAPOT is the surface of a teapot.

• teapot_nodes.txt, the 3D coordinates of 530 nodes;
• teapot_triangles.txt, the 1024 triangles formed from the nodes;
• teapot.png, a PNG image of the surface.

TETRAHEDRON is the surface of a tetrahedron.

• tetrahedron_nodes.txt, the 3D coordinates of 4 nodes;
• tetrahedron_triangles.txt, the 4 triangles formed from the nodes;
• tetrahedron.png, a PNG image of the surface.

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