Problem with scale after export to 3DS max format and DXF/STL #104713

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Timur-59 · 2023-06-23T06:44:57+02:00

Timur-59 commented

2023-06-23 06:44:57 +02:00

Operating system: Win 10 x64
Graphics card: RTX 3070Ti

Broken: addon 3Ds in Blender 3.6 version

Hello! I have a problem after import/export to 3Ds format. In Blender i have object with scale 2000x2000mm, after export in 3Ds format and open in Autodesk 3Ds Max 2020/2021/2023 version i have scale 50,8mm
Same problem with STL format export in all versions of Blender 3.0-3.5 (But in that case, the scale decreases a hundred times). In Blender 1000mm, after export STL or DXF format and open in Autocad/Kompas3D/Autodesk 3Ds Max scale = 1mm!

Operating system: Win 10 x64 Graphics card: RTX 3070Ti Broken: addon 3Ds in Blender 3.6 version Hello! I have a problem after import/export to 3Ds format. In Blender i have object with scale 2000x2000mm, after export in 3Ds format and open in Autodesk 3Ds Max 2020/2021/2023 version i have scale 50,8mm Same problem with STL format export in all versions of Blender 3.0-3.5 (But in that case, the scale decreases a hundred times). In Blender 1000mm, after export STL or DXF format and open in Autocad/Kompas3D/Autodesk 3Ds Max scale = 1mm!

BlenderExport3Dsjpg.jpg

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Timur-59 added the

labels 2023-06-23 06:44:57 +02:00

Sebastian Sille commented

2023-06-27 17:08:40 +02:00

@Timur-59
You have to uncheck Convert units, if checked, 3ds max assumes inches, here a quote from 3ds max manual

Convert units
When turned on, 3ds Max assumes units in the imported file to be in inches, and converts them to the current system of units. When turned off, 3ds Max assumes the units in the imported file match the current scene unit and doesn't convert the units.

Usually it should be 1:1000 scale because blender uses meters and 3ds max uses millimeters, that means blender objects will be smaller by factor 1000 if you import. That is an known issue, many applications using different ways to scale 3ds files, the 3ds file itself does not store any unit definitions, only the float value. You can scale up the models by factor 1000 in blender before export or you can scale up in 3ds max by factor 1000 after import

@Timur-59 You have to uncheck `Convert units`, if checked, 3ds max assumes inches, here a quote from 3ds max [manual](https://help.autodesk.com/view/3DSMAX/2020/ENU/?guid=GUID-8F8CFD1E-AF90-42E3-9306-9A058F0ECD5F) > Convert units > When turned on, 3ds Max assumes units in the imported file to be in inches, and converts them to the current system of units. When turned off, 3ds Max assumes the units in the imported file match the current scene unit and doesn't convert the units. Usually it should be 1:1000 scale because blender uses meters and 3ds max uses millimeters, that means blender objects will be smaller by factor 1000 if you import. That is an known issue, many applications using different ways to scale 3ds files, the 3ds file itself does not store any unit definitions, only the float value. You can scale up the models by factor 1000 in blender before export or you can scale up in 3ds max by factor 1000 after import

Sebastian Sille added

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labels 2023-06-27 17:29:29 +02:00

Sebastian Sille added

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labels 2023-06-27 17:47:28 +02:00

Sebastian Sille commented

2023-07-03 10:31:39 +02:00

#71704 descripes how to setup blender to millimeters, you have to do this setup before importing the stl or 3ds file.

[#71704](https://projects.blender.org/blender/blender/issues/71704) descripes how to setup blender to millimeters, you have to do this setup before importing the stl or 3ds file.

Sebastian Sille added

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labels 2023-07-03 12:04:52 +02:00

Sebastian Sille commented

2023-07-21 23:57:00 +02:00

The 3ds exporter now got the option to scale the complete scene before export, set to 1000 to convert from meters to millimeters

Pull Request #104767

The 3ds exporter now got the option to scale the complete scene before export, set to 1000 to convert from meters to millimeters Pull Request #104767