STL importer ValueError exception #34682

New Issue

Florian Lindner · 2013-03-18T21:54:25+01:00

Florian Lindner commented

2013-03-18 21:54:25 +01:00

%%%Importing an STL file gives the following traceback:

Traceback (most recent call last):

File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/__init__.py", line

104, in execute

  tris, pts = stl_utils.read_stl(path)
File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line

249, in read_stl

  for pt in gen(data):
File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line

156, in _ascii_read

  for _ in range(3)]
File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line

156, in

  for _ in range(3)]

ValueError: could not convert string to float: b'loop'

STL file fragment that produces the crash is attached, or simple take:

solid Solid

 color       0.81961 0.18824 0.42353
facet normal 0.288935958 0.957348417 -0.000142096066
  outer loop
    vertex 681.368134 2.98766105 520.700039
    vertex 683.077134 2.4718702 520.700027
    vertex 681.368674 2.98636304 513.052942
  endloop
endfacet

endsolid Solid

First investigatios at stl_utils.py:

def _ascii_read(data):
- an stl ascii file is like
- HEADER: solid some name
- for each face:
#
- facet normal x y z
- outerloop
- vertex x y z
- vertex x y z
- vertex x y z
- endloop
# endfacet

My STL differs, it's:
solid Solid
color R G B
facet normal 0.288935958 0.957348417 -0.000142096066
outer loop
vertex x y z
vertex x y z
vertex x y z
endloop
endfacet
I have a an additional color line in the header and mit loop is initated
by outer loop (which does not matter with the code)

strip header

  data.readline()  #  strips "solid Solid"

  while True:

    # strip facet normal // or end

      data.readline()  # strips color not facet, so it's one line off

    - strip outer loup, in case of ending, break the loop
    - Here is strips "facet..."

      if not data.readline():
          break

   # Crashes because it tried to convert "outer" to float

      yield [tuple(map(float, data.readline().split()[1:]))
             for _ in range(3)]

    # strip facet normalend and outerloop end

      data.readline()
      data.readline()

Adding another data.readline() at the top to strip the color header makes the
loop run fine till the end. My STL has a trailing newline at the last line
which makes the loop crash at this now.

The STLs are generated by ANSA or CATIA and accepted from Paraview, Numeca
Spider or OpenFOAM's snappyHexMesh. (these STLs are input geometries for CFD
calculations).

- Operating System, Graphics card ---

Arch Linux

- Blender version with error, and version that worked ---

Blender 2.66a / 2.66.1
%%%

%%%Importing an STL file gives the following traceback: Traceback (most recent call last): ``` File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/__init__.py", line ``` 104, in execute ``` tris, pts = stl_utils.read_stl(path) File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line ``` 249, in read_stl ``` for pt in gen(data): File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line ``` 156, in _ascii_read ``` for _ in range(3)] File "/usr/share/blender/2.66/scripts/addons/io_mesh_stl/stl_utils.py", line ``` 156, in <listcomp> ``` for _ in range(3)] ``` ValueError: could not convert string to float: b'loop' STL file fragment that produces the crash is attached, or simple take: solid Solid ``` color 0.81961 0.18824 0.42353 facet normal 0.288935958 0.957348417 -0.000142096066 outer loop vertex 681.368134 2.98766105 520.700039 vertex 683.077134 2.4718702 520.700027 vertex 681.368674 2.98636304 513.052942 endloop endfacet ``` endsolid Solid First investigatios at stl_utils.py: def _ascii_read(data): - an stl ascii file is like - HEADER: solid some name - for each face: # - facet normal x y z - outerloop - vertex x y z - vertex x y z - vertex x y z - endloop # endfacet - My STL differs, it's: - solid Solid - color R G B - facet normal 0.288935958 0.957348417 -0.000142096066 - outer loop - vertex x y z - vertex x y z - vertex x y z - endloop - endfacet - I have a an additional color line in the header and mit loop is initated - by outer loop (which does not matter with the code) # strip header ``` data.readline() # strips "solid Solid" ``` ``` while True: ``` # strip facet normal // or end ``` data.readline() # strips color not facet, so it's one line off ``` - strip outer loup, in case of ending, break the loop - Here is strips "facet..." ``` if not data.readline(): break ``` # Crashes because it tried to convert "outer" to float ``` yield [tuple(map(float, data.readline().split()[1:])) for _ in range(3)] ``` # strip facet normalend and outerloop end ``` data.readline() data.readline() ``` Adding another data.readline() at the top to strip the color header makes the loop run fine till the end. My STL has a trailing newline at the last line which makes the loop crash at this now. The STLs are generated by ANSA or CATIA and accepted from Paraview, Numeca Spider or OpenFOAM's snappyHexMesh. (these STLs are input geometries for CFD calculations). - Operating System, Graphics card --- Arch Linux - Blender version with error, and version that worked --- Blender 2.66a / 2.66.1 %%%

Florian Lindner commented

2013-03-18 21:54:25 +01:00

Changed status to: 'Open'

Campbell Barton commented

2013-03-26 05:07:08 +01:00

%%%fix r4429 of the extensions repo.%%%

Campbell Barton commented

2013-03-26 05:07:10 +01:00

Changed status from 'Open' to: 'Resolved'

Campbell Barton closed this issue

2013-03-26 05:07:10 +01:00

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STL importer ValueError exception #34682

strip header