Tet file generation example for Isaac Gym Soft Body meshes using fTetWild

mesh_to_tet.py

"""
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Tet file generation example for Isaac Gym Soft Body meshes using fTetWild

"""

mesh_file = open("hollow_flask.mesh", "r")
tet_output = open("hollow_flask.stl.tet", "w")

mesh_lines = list(mesh_file)
mesh_lines = [line.strip('\n') for line in mesh_lines]
vertices_start = mesh_lines.index('Vertices')
num_vertices = mesh_lines[vertices_start + 1]

vertices = mesh_lines[vertices_start + 2: vertices_start + 2 + int(num_vertices)]

tetrahedra_start = mesh_lines.index('Tetrahedra')
num_tetrahedra = mesh_lines[tetrahedra_start + 1]
tetrahedra = mesh_lines[tetrahedra_start + 2 : tetrahedra_start + 2 + int(num_tetrahedra)]

print(num_vertices, num_tetrahedra)

# Write to tet output
tet_output.write("# Tetrahedral mesh generated using\n\n")
tet_output.write("# " + num_vertices + " vertices\n")
for v in vertices:
	tet_output.write("v " + v + "\n")
tet_output.write("\n")
tet_output.write("# " + num_tetrahedra + " tetrahedra\n")
for t in tetrahedra:
	l = t.split(' 0')[0]
	l = l.split(" ")
	l = [str(int(k) - 1) for k in l]
	l_text = ' '.join(l)
	tet_output.write("t " + l_text + "\n")