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FYI, the immediate question I have when reading the headline or this comment is: 3d view of ...what?

After clicking: When should I use this, when I'm developing 3d printer software and want to preview files or so? Who is this for?

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Well, it's a viewer of 3D files. You have a 3D file, you double click on it, it opens, you can look around.

My gut instinct is game developers or others in the asset pipeline, which have hundreds/thousands of obj, fbx, etc files laying around, and 3d editors such as Blender are not exactly fast to open if you just want a quick preview.

Exactly, F3D also supports generating thumbnails!

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