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Whenever I export a mesh, wich is just a tiny bit complex from blender to an .obj file, some parts of the mesh are ending up wierdly distorted. The only solution I found is to check "triangulate faces" at the export options. But shouldn't it work without that?

The mesh in blender: The mesh in Blender:

The mesh in Marmoset Toolbag: The mesh in Marmoset Toolbag

Here the .blend file: https://www.mediafire.com/folder/b8xga0wnsmwew/blender

In other programs, the same.

Any help is appriciated Nightfox3

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The problem with your mesh are Ngons; Blender can process and show them correctly but once exported you get unexpected results because they are treated in a different way by another program.

This is what model looks like:

original model screenshots

The reason why it worked with Triangulate faces checked is because there were no Ngons any more, all them were converted to tris. You can use this way, however you won't be able to control how it will triangulate faces.

Hence I suggest to start with changed topology of the model (note: it may be a bit complex to redo for all the model, however it will save time further on):

screenshot of better topology of the model

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Only thing I can think of is that most render engines can only render tris, Cycles included. It could have to do with the way Toolbag imports...

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