from ddg.indexedfaceset import IndexedFaceSet
[docs]def ifs_to_obj(ifs, obj_name, file_location, attribute_name="co"):
"""
Convert an IndexedFaceSet to an obj wavefront format.
Parameters
----------
ifs : ddg.indexedfaceset.IndexedFaceSet
obj_name : string
Name of the surface in the obj file
file_location : string
Path to where the obj file should be saved
attribute_name : string (default="co")
Name of the IndexedFaceSet vertex attribute storing the coordinates
Returns
-------
None
"""
if not isinstance(ifs, IndexedFaceSet):
raise TypeError("Input must be an IndexedFaceSet")
if attribute_name not in ifs.vertex_attributes:
raise AttributeError(f'IFS must have "{attribute_name}" vertex attributes.')
lines = ["# generated with pyddg library."]
lines.append("o " + obj_name)
if ifs.vertex_attributes[attribute_name].shape[1] != 3:
raise ValueError("The coordinate attribute must be 3 dimensional.")
for attr in ifs.vertex_attributes[attribute_name]:
lines.append(f"v {attr[0]:.4f} {attr[1]:.4f} {attr[2]:.4f}")
for face in ifs.face_list():
lines.append("f " + " ".join([str(vert + 1) for vert in face]))
with open(file_location, "w") as f:
f.write("\n".join(lines))