IndexError: list index out of range while importing wrl file #51334

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Fabrizio Pelosi · 2017-04-27T14:23:37+02:00

Fabrizio Pelosi commented

2017-04-27 14:23:37 +02:00

System Information
Windows 10 and Windows 7 (Intel GPU)

Blender Version
Broken: 2.78c

Short description of error
Addon: Import VRML/X3D
IndexError: list index out of range while importing wrl file

Exact steps for others to reproduce the error
Traceback (most recent call last):

File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\__init__.py", line 81, in execute
  return import_x3d.load(context, **keywords)
File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3601, in load
  global_matrix=global_matrix,
File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3498, in load_web3d
  importShape(bpyscene, node, ancestry, global_matrix)
File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3122, in importShape
  bpydata = geom_fn(geom, ancestry, bpyima)
File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 1982, in importMesh_IndexedFaceSet
  cco = [cco for (i, f) in enumerate(faces) for j in f
File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 1983, in <listcomp>
  for cco in rgb[i]]

IndexError: list index out of range

location: :-1

With MeshLab 2016.12 I can open the file.

unita65_XXX.wrl

**System Information** Windows 10 and Windows 7 (Intel GPU) **Blender Version** Broken: 2.78c **Short description of error** Addon: Import VRML/X3D IndexError: list index out of range while importing wrl file **Exact steps for others to reproduce the error** Traceback (most recent call last): ``` File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\__init__.py", line 81, in execute return import_x3d.load(context, **keywords) File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3601, in load global_matrix=global_matrix, File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3498, in load_web3d importShape(bpyscene, node, ancestry, global_matrix) File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 3122, in importShape bpydata = geom_fn(geom, ancestry, bpyima) File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 1982, in importMesh_IndexedFaceSet cco = [cco for (i, f) in enumerate(faces) for j in f File "C:\Program Files\Blender Foundation\Blender\2.78\scripts\addons\io_scene_x3d\import_x3d.py", line 1983, in <listcomp> for cco in rgb[i]] ``` IndexError: list index out of range location: <unknown location>:-1 With MeshLab 2016.12 I can open the file. [unita65_XXX.wrl](https://archive.blender.org/developer/F574589/unita65_XXX.wrl)

Fabrizio Pelosi commented

2017-04-27 14:23:38 +02:00

Changed status to: 'Open'

Fabrizio Pelosi commented

2017-04-27 14:23:38 +02:00

Added subscriber: @FabrizioPelosi

Sergey Sharybin commented

2017-05-22 15:51:39 +02:00

Added subscribers: @mont29, @ideasman42, @Sergey

Campbell Barton was assigned by Sergey Sharybin

2017-05-22 15:51:39 +02:00

Sergey Sharybin commented

2017-05-22 15:51:39 +02:00

@ideasman42, guess this one is again for you? Or maybe @mont29? :)

Brendon Murphy commented

2019-06-11 11:39:31 +02:00

Added subscriber: @BrendonMurphy

Brendon Murphy commented

2019-06-11 11:39:31 +02:00

Changed status from 'Open' to: 'Archived'

Brendon Murphy closed this issue

2019-06-11 11:39:31 +02:00

Brendon Murphy commented

2019-06-11 11:39:31 +02:00

no activity 2017, closing as archived

David Balogh commented

2020-07-28 15:40:00 +02:00

Added subscriber: @davidbgh

David Balogh commented

2020-07-28 15:40:00 +02:00

[exported from SolidWorks 2013] [VRML 97] [Blender 2.83.2]
This happens for me, if the .wrl contains only one object/part. (if the solidworks assembly contains only one part then it fails, but succeed when contains two)

[exported from SolidWorks 2013] [VRML 97] [Blender 2.83.2] This happens for me, if the .wrl contains only one object/part. (if the solidworks assembly contains only one part then it fails, but succeed when contains two)

Ilya Methot commented

2020-08-20 21:50:33 +02:00

Added subscriber: @ilya.methot.3ds

Ilya Methot commented

2020-08-20 21:50:33 +02:00

I have this exact same problem and it has made it impossible to import any of my VRML files

Sergey Sharybin commented

2020-08-21 10:33:07 +02:00

Changed status from 'Archived' to: 'Needs Triage'

Sergey Sharybin reopened this issue

2020-08-21 10:33:07 +02:00

Sergey Sharybin commented

2020-08-21 10:33:07 +02:00

Re-opening, because lack of activity was from the developer team.

We should not ship addon which can not handle simple files import. We should either fix the code, or remove support of legacy files which are not supported due to issues in the code anyway.

@BrendonMurphy, Could you please help evaluating the state of this addon?

Re-opening, because lack of activity was from the developer team. We should not ship addon which can not handle simple files import. We should either fix the code, or remove support of legacy files which are not supported due to issues in the code anyway. @BrendonMurphy, Could you please help evaluating the state of this addon?

Robert Guetzkow commented

2020-11-19 12:34:14 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-11-19 12:34:14 +01:00

The issue appears to be that there is only a single color defined while there are a number of faces. Trying to enumerate the faces and using the index of the face to access a color is therefore expected to fail. While I have only taken a quick look at the the X3D and VRML specification, I think the file is potentially invalid.

Robert Guetzkow commented

2020-11-20 15:23:14 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Robert Guetzkow closed this issue

2020-11-20 15:23:14 +01:00

Robert Guetzkow commented

2020-11-20 15:23:14 +01:00

Based on the following section of the specification about the IndexedFaceSet the file is invalid:

If colorPerVertex is FALSE, colors are applied to each face, as follows:

If the colorIndex field is not empty, then they are used to choose one color for each face of the IndexedFaceSet. There must be at least as many indices in the colorIndex field as there are faces in the IndexedFaceSet. If the greatest index in the colorIndex field is N, then there must be N+1 colors in the Color node. The colorIndex field must not contain any negative entries.

If the colorIndex field is empty, then the colors are applied to each face of the IndexedFaceSet in order. There must be at least as many colors in the Color node as there are faces.

The file contains an IndexedFaceSet , the colorPerVertex is set to FALSE, yet there is only one color defined:

geometry IndexedFaceSet {
color Color {
color [
 0.792157 0.819608 0.933333
]
}

Based on the following [section ](http://www.graphics.stanford.edu/courses/cs248-98-fall/Assignments/Assignment3/VRML2_Specification/spec/part1/nodesRef.html#IndexedFaceSet) of the specification about the `IndexedFaceSet` the file is invalid: > If colorPerVertex is FALSE, colors are applied to each face, as follows: > - If the colorIndex field is not empty, then they are used to choose one color for each face of the IndexedFaceSet. There must be at least as many indices in the colorIndex field as there are faces in the IndexedFaceSet. If the greatest index in the colorIndex field is N, then there must be N+1 colors in the Color node. The colorIndex field must not contain any negative entries. > - **If the colorIndex field is empty, then the colors are applied to each face of the IndexedFaceSet in order. There must be at least as many colors in the Color node as there are faces.** The file contains an `IndexedFaceSet `, the `colorPerVertex` is set to `FALSE`, yet there is only one color defined: ``` geometry IndexedFaceSet { color Color { color [ 0.792157 0.819608 0.933333 ] } ```

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