def __init__(self, obj_file):
"""
Create a surface from an obj file
"""
self.logger = get_logger(__name__)
try:
obj = ObjParser()
obj.read(obj_file)
self.triangles = []
self.vertices = obj.vertices
self.normals = [(0.0, 0.0, 0.0)] * len(self.vertices)
self.have_normals = len(obj.normals)
for face in obj.faces:
triangles = self._triangulate(face)
for v_idx, t_idx, n_idx in triangles:
self.triangles.append(v_idx)
if n_idx != -1:
# last normal index wins
# alternative: self.normals[v_idx] += obj.normals[n_idx]
# The correct behaviour is to duplicate the vertex
# self.vertices.append(self.vertices[v_idx])
# self.tex_coords.append(self.tex_coords[v_idx])
self.normals[v_idx] = obj.normals[n_idx]
# checks
if not self.vertices or not self.triangles:
raise ParseException("No geometry data in file.")
self._to_numpy()
except ValueError as ex:
self.logger.exception(" Error in obj")
raise ParseException(str(ex))
def __init__(self, obj_file):
"""
Create a surface from an obj file
"""
self.logger = get_logger(__name__)
try:
obj = ObjParser()
obj.read(obj_file)
self.triangles = []
self.vertices = obj.vertices
self.normals = [(0.0, 0.0, 0.0)] * len(self.vertices)
self.have_normals = len(obj.normals)
for face in obj.faces:
triangles = self._triangulate(face)
for v_idx, t_idx, n_idx in triangles:
self.triangles.append(v_idx)
if n_idx != -1:
# last normal index wins
# alternative: self.normals[v_idx] += obj.normals[n_idx]
# The correct behaviour is to duplicate the vertex
# self.vertices.append(self.vertices[v_idx])
# self.tex_coords.append(self.tex_coords[v_idx])
self.normals[v_idx] = obj.normals[n_idx]
# checks
if not self.vertices or not self.triangles:
raise ParseException("No geometry data in file.")
self._to_numpy()
except ValueError as ex:
self.logger.exception(" Error in obj")
raise ParseException(str(ex))
def test_write_parse_cycle(self):
f = StringIO()
w = ObjWriter(f)
vertices = [(0, 0, 0), (1, 0, 0), (0, 1, 0), (0, 0, 1)]
normals = [(0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1)]
triangles = [(0, 1, 2), (0, 1, 3)]
w.write(vertices, triangles, normals)
f.seek(0)
p = ObjParser()
p.read(f)
assert vertices == p.vertices
assert normals == p.normals
def test_write_parse_cycle(self):
f = StringIO()
w = ObjWriter(f)
vertices = [(0, 0, 0), (1, 0, 0), (0, 1, 0), (0, 0, 1)]
normals = [(0, 0, 1), (0, 0, 1), (0, 0, 1), (0, 0, 1)]
triangles = [(0, 1, 2), (0, 1, 3)]
w.write(vertices, triangles, normals)
f.seek(0)
p = ObjParser()
p.read(f)
self.assertEqual(vertices, p.vertices)
self.assertEqual(normals, p.normals)