For testing purposes, here are some simplified versions of some of the meshes above. The filenames indicate how many triangles there are in the mesh.
The following models are all manifolds with exactly 1 boundary loop.
The file format used here is a very limited subset of the Wavefront OBJ format. The files consist of a series of lines:
# Any line starting with a '#' character is a comment
v x1 y1 z1
v x2 y2 x2
.
.
.
f i1 j1 k1
f i2 j2 k2
.
.
.
Each v
line defines a new vertex. Vertices are implicitly
numbered by their order of appearance starting with 1.
Each f
line defines a triangle by giving the integer IDs of the
vertices which forms its 3 corners.
You can generate infinitely many more examples using the Maya software installed in the CSIL labs.
Here are a few very simple examples to illustrate how actual meshes look when written in OBJ format.
This is a simple tetrahedron with 1 corner at the origin and with the other 3 vertices in the positive x, y, and z directions.
v 1.0 0.0 0.0
v 0.0 1.0 0.0
v 0.0 0.0 1.0
v 0.0 0.0 0.0
f 2 4 3
f 4 2 1
f 3 1 2
f 1 3 4
This is the standard cube covering [0,1]^3. Note that it’s been triangulated.
# Vertices on the bottom of the cube (z=0)
v 0 0 0
v 1 0 0
v 0 1 0
v 1 1 0
# Vertices on the top of the cube (z=1)
v 0 0 1
v 1 0 1
v 0 1 1
v 1 1 1
# Triangles on the bottom
f 1 4 2
f 1 3 4
# Triangles on the top
f 5 6 8
f 5 8 7
# All the remaining sides
f 1 2 6
f 1 6 5
f 2 4 8
f 2 8 6
f 4 3 7
f 4 7 8
f 3 1 5
f 3 5 7