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I guess the real question is: Why, if you ever want anything more than reading from a pdf, you have to hunt down a list of tools (acroread, evince, okular) and hope to find one that does what you want (select a column, fill out fields in a normal font, copy text with newlines intact)…

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...also if you want to see 3D inside a PDF. At this point, only arcoread does that and it's Linux version has been discontinued years ago:(

Do you often find yourself needing 3D in pdfs? I know it's there but have never encountered it in the wild. Is it a certain field or specialty that uses this feature?

3D software can export into PDF not only parametric models but also a tree defining the dependency structure, which is awesome and cross platform... except it isn't really due to lack of implementation in PDF viewers.

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