import a stl file , get empty #100402

New Issue

kokutou · 2022-08-15T05:51:10+02:00

kokutou commented

2022-08-15 05:51:10 +02:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: AMD Radeon R7 450 ATI Technologies Inc. 4.5.14830 Core Profile Context 22.6.1 27.20.20912.1002

Blender Version
Broken: version: 3.2.2, branch: master, commit date: 2022-08-02 18:15, hash: bcfdb14560
Worked: rhino 7 import ok.

Addon Information
Name: STL format (1, 1, 3)
Author: Guillaume Bouchard (Guillaum)

Short description of error
import a stl file , get empty

Exact steps for others to reproduce the error
import a stl file , get empty
stl file:
slider_2_v2_d10.7z

import use rhino 7 works fine.

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: AMD Radeon R7 450 ATI Technologies Inc. 4.5.14830 Core Profile Context 22.6.1 27.20.20912.1002 **Blender Version** Broken: version: 3.2.2, branch: master, commit date: 2022-08-02 18:15, hash: `bcfdb14560` Worked: rhino 7 import ok. **Addon Information** Name: STL format (1, 1, 3) Author: Guillaume Bouchard (Guillaum) **Short description of error** import a stl file , get empty **Exact steps for others to reproduce the error** import a stl file , get empty stl file: [slider_2_v2_d10.7z](https://archive.blender.org/developer/F13385300/slider_2_v2_d10.7z) import use rhino 7 works fine.

kokutou commented

2022-08-15 05:51:10 +02:00

Added subscriber: @kokutoukiritsugu

Robert Guetzkow commented

2022-08-15 12:35:16 +02:00

Added subscriber: @rjg

Omar Emara commented

2022-08-16 14:07:28 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-08-16 14:07:28 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Omar Emara commented

2022-08-16 14:07:28 +02:00

Validating the mesh using assimp yields:

ERROR: Failed to load file: Validation failed: The mesh SLIDER_2_V2_D10 contains no vertices

So I suspect the file is corrupt. How did you generate that file?

Validating the mesh using assimp yields: ``` ERROR: Failed to load file: Validation failed: The mesh SLIDER_2_V2_D10 contains no vertices ``` So I suspect the file is corrupt. How did you generate that file?

kokutou commented

2022-08-19 09:49:15 +02:00

ptc creo export stl

Omar Emara commented

2022-08-19 10:50:29 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Omar Emara commented

2022-08-19 10:50:29 +02:00

It seems the issue is that the file is detected as ASCII while it is in fact a binary STL file.

First, note that the file starts with solid SLIDER_2_V2_D10, but that is part of the 80 header bytes, so it is not an ASCII file.
The number of triangles in the file is 7658. So the expected file size in bytes should be 80 + 4 + 7658 * 50 = 382984.
The actual file size is 382992. So there are 8 bytes unaccounted for. Hence the STL importer decides that this is an ASCII file even though it is a binary one.
The file ends with extra 8 null/zero bytes.
Maybe I am missing something with regards to the STL specification so I will tag the module since we have a new experimental STL importer.
Maybe the importer should allow extra padding bytes at the end that don't exceed 50 bytes?

It seems the issue is that the file is detected as ASCII while it is in fact a binary STL file. - First, note that the file starts with `solid SLIDER_2_V2_D10`, but that is part of the 80 header bytes, so it is not an ASCII file. - The number of triangles in the file is 7658. So the expected file size in bytes should be 80 + 4 + 7658 * 50 = 382984. - The actual file size is 382992. So there are 8 bytes unaccounted for. Hence the STL importer decides that this is an ASCII file even though it is a binary one. - The file ends with extra 8 null/zero bytes. Maybe I am missing something with regards to the STL specification so I will tag the module since we have a new experimental STL importer. Maybe the importer should allow extra padding bytes at the end that don't exceed 50 bytes?

Bastien Montagne added this to the Pipeline, Assets & IO project 2023-02-09 15:39:30 +01:00

Philipp Oeser removed the

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import a stl file , get empty #100402