Error trying to define Body using model.obj files to fit chords

[andres-baquero]

Hi. I'm trying to fit an occultation chord to 3D shape model for Tombecka asteroid, but I'm getting this error "ValueError: could not convert string to float: " with the model.obj file. I'm using the code used in the example: https://sora.readthedocs.io/en/latest/examples/shape3d.html

import requests
response = requests.get("https://3d-asteroids.space/data/asteroids/models/t/1013_Tombecka_2357.obj")
open("Tombecka_Durech_48k_poly.obj", "wb").write(response.content)

from sora import Body
tombecka = Body(name="Tombecka", shape="Tombecka_Durech_48k_poly.obj", ephem="horizons")

SORA version: 0.3
Obtaining data for Tombecka from SBDB

ValueErrorTraceback (most recent call last)
in
1 from sora import Body
----> 2 tombecka = Body(name="Tombecka", shape="Tombecka_Durech_48k_poly.obj", ephem="horizons")
3 # Now, we include the texture in the shape of Phoebe
4 #phoebe.shape.texture = "Phoebe_Grayscale.jpg"

/fefs/aswg/workspace/andres.baquero/miniconda3/envs/lst-dev-073/lib/python3.7/site-packages/sora/body/core.py in init(self, name, database, **kwargs)
137 self.spectral_type['Tholen']['value'] = kwargs.pop('tholen')
138 for key in kwargs:
--> 139 setattr(self, key, kwargs[key])
140 self._shared_with['ephem']['search_name'] = self._search_name
141 self._shared_with['ephem']['id_type'] = self._id_type

/fefs/aswg/workspace/andres.baquero/miniconda3/envs/lst-dev-073/lib/python3.7/site-packages/sora/body/meta.py in shape(self, value)
396 self._shape = value
397 elif isinstance(value, str):
--> 398 self._shape = Shape3D(value)
399 else:
400 value = np.array(value, ndmin=1, dtype=np.float)

/fefs/aswg/workspace/andres.baquero/miniconda3/envs/lst-dev-073/lib/python3.7/site-packages/sora/body/shape/core.py in init(self, obj_file, texture, scale)
30 def init(self, obj_file, texture=None, scale=1) -> None:
31 super(Shape3D, self).init()
---> 32 vertices, faces = read_obj_file(obj_file)
33 self.name = obj_file
34 self._vertices = CartesianRepresentation(*vertices.T, unit=u.km)

/fefs/aswg/workspace/andres.baquero/miniconda3/envs/lst-dev-073/lib/python3.7/site-packages/sora/body/shape/utils.py in read_obj_file(filename)
36 faces.append([i.split('/')[0] for i in values])
37
---> 38 vertices = np.array(vertices, dtype='float')
39 faces = np.array(faces, dtype='int32')
40 return vertices, faces

ValueError: could not convert string to float:

The same occur when I'm tried to used a model for Krylov asteroid obtained from: https://astro.troja.mff.cuni.cz/projects/damit/asteroid_models/view/3153

[altairgomes]

Dear @andres-baquero
This issue is fixed and will be soon published on SORA v0.3.1.
The error arises from the way SORA is reading the OBJ file.
It expects only one space between numbers.

It follows a code snippet that can convert your OBJ file to one that SORA can read in v0.3.0.

def convert(input_file, output_file):
    with open(input_file, 'r') as f:
        lines = f.readlines()
    with open(output_file, 'w') as f:
        for l in lines:
            f.write(' '.join(l.split()) + '\n')

convert('Tombecka.obj', 'Tombecka_2.obj')