Tetgen_gui

Tetgen_gui is a tiny GUI wrapper for Tetgen. It takes in a 3D mesh in obj/ply/off/stl format and tetrahedralize it.

Compile

git clone https://github.com/milkpku/tetgen_gui.git
cd tetgen_gui && mkdir build && cd build
cmake .. && make

Usage

1. Load mesh: type in input file name in input file and click Open.

2. Tetrahedralize mesh: type in parameter for tetgen in parameters and click Tetrahedralize.

3. Select interested regions: After tetrahedralization, tetrahedrons will be clustered into different regions. Check interested regions to select them. Only tetrahedrons in selected regions will be exported in next step.

4. Output tetrahedron mesh: type in output file name in output file, select whether remove unreferred vertices or export region information.

Output Format

At the beginning of .vtx file, a line starts with txn specifies the number of attributes attached to each tetrahedron, here we take one channel to store region id of each tetrahedron when this information is required.

.vtx format is similar to .obj format, mainly contains two kinds of elements:

• Vertex: starts with v with format v x y z, where (x, y, z) is the location of the vertex.
• Tetrahedron: starts with t with format t x y z w <attributes>, where (x, y, z, w) contains indices to four vertices, representing a tetrahedron, and the facet (x, y, z) faces outside. Note that the index for vertices starts with 0 rather than 1. <attributes> are attributes assigned to each tetrahedron.

Here are two examples, corresponding to outputs with/without region information:

# writing with .vtx format
v 0.000000 0.000000 0.000000
v 1.000000 0.000000 0.000000
v 0.000000 1.000000 0.000000
v 0.000000 0.000000 1.000000
t 1 2 3 0

# writing with .vtx format
txn 1
v 0.000000 0.000000 0.000000
v 1.000000 0.000000 0.000000
v 0.000000 1.000000 0.000000
v 0.000000 0.000000 1.000000
t 1 2 3 0 1