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In the OBJ file if the first line starts with a invisible BOM char like:\uFEFFmtllib model.mtl the parsing of the textures does not work.
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Pull Request Overview
Adds handling for UTF-8 BOM characters at the start of OBJ/MTL files to ensure correct parsing of mtllib and other tokens.
- Introduce
removeUtf8Bomhelper to strip BOM bytes if present. - Invoke BOM removal on each line before token parsing in
LoadMtlandLoadObj.
Comments suppressed due to low confidence (1)
tiny_obj_loader.h:2124
- The new BOM-removal behavior isn't covered by existing tests. Add unit tests for lines starting with
\uFEFFto ensure this function works as expected.
linebuf = removeUtf8Bom(linebuf);
Collaborator
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Please add reproducible test .obj/.mtl to |
Co-authored-by: Copilot <[email protected]>
Co-authored-by: Copilot <[email protected]>
Add if (line_no == 1) removeUtf8Bom(linebuf) to obj aswell
Contributor
Author
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@syoyo I added a unit test for removeUtf8Bom and a test with UTF-8 BOM encoded models. As Copilot suggested I also added the BOM check to the MTL file not only the obj file. Let me know if there are any further changes you want me to make. |
Collaborator
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@paulbauriegel Thank you! Will be merged soon after the review. |
Collaborator
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Merged! Thanks! |
syoyo
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Nov 10, 2025
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In the OBJ file if the first line starts with a invisible BOM char like: \uFEFFmtllib model.mtl
The parsing of the textures does not work in that case because of
if ((0 == strncmp(token, "mtllib", 6)) && IS_SPACE((token[6]))) {