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Link is broken, and Acrobat doens't have the auto convert function any more 😞
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There was a plugin for Acrobat Pro provided by Tetra4D, I don't know if it still exists:
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I have found a free 3D application "MeshLab"
With Meshlab you can convert many 3D formats in the famous .U3D format !
http://meshlab.sourceforge.net/
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I realize this is an old thread. But since acrobat pro supports 3d objects, the only way I found to use u3d files is to use photoshop CS5, that format was removed for CS6 and CC I don't know why, you would think they would have kept it, until acrobat supported other formats.
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I have PhotoShop CS6 with 3D support (not sure what that version is called specificaly) and the U3D export is still there.
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You should see this site, it's all about 3D PDF: https://www.3dpdfmaker.com/
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Using the software Agisoft Metashape (even the free or trial version), you can also import your textured 3D models and export as u3d filetypes for Adobe Acrobat. Aside from using meshlab, which in my opinion can be a tempermental and not very user-friendly, this is the best free option. Steps to doing this are below:
Import your model:
File -> Import -> Import Model
Export as u3d:
File -> Export -> Export Model -> Save as Type -> Select "U3D models (*.u3d)"