def parse_f(self, args):
if (len(self.tex_coords) > 1) and (len(self.normals) == 1):
# does the spec allow for texture coordinates without normals?
# if we allow this condition, the user will get a black screen
# which is really confusing
raise PywavefrontException(
'Found texture coordinates, but no normals')
if self.mesh is None:
self.mesh = mesh.Mesh()
self.wavefront.add_mesh(self.mesh)
if self.material is None:
self.material = material.Material()
self.material.colors = []
self.wavefront.materials[self.material.name] = self.material
self.mesh.add_material(self.material)
# For fan triangulation, remember first and latest vertices
v1 = None
vlast = None
points = []
has_color = isinstance(self.material.colors, list)
for i, v in enumerate(args[0:]):
if type(v) is bytes:
v = v.decode()
v_index, t_index, n_index = \
(list(map(int, [j or 0 for j in v.split('/')])) + [0, 0])[:3]
if v_index < 0:
v_index += len(self.vertices) - 1
if t_index < 0:
t_index += len(self.tex_coords) - 1
if n_index < 0:
n_index += len(self.normals) - 1
vertex = list(self.tex_coords[t_index]) + \
list(self.normals[n_index]) + \
list(self.vertices[v_index])
if has_color:
self.material.colors += list(self.colors[v_index])
if i >= 3:
# Triangulate
self.material.vertices += v1 + vlast
self.material.vertices += vertex
if i == 0:
v1 = vertex
vlast = vertex
def parse_o(self, args):
[o] = args
self.mesh = mesh.Mesh(o)
self.wavefront.add_mesh(self.mesh)