Creating 3D objects

I am currently coding some 3D shapes using P3D mode (with and without the use of void draw()).
The aim is to create 3D file in format OBJ, which can be then used eg. for fabrication such as 3D printing.
I have several Processing books but they do not seem to have much information to achieve the above, can you recommend some learning resources, such as sample coding, explanation of different file formats, books, links to reading materials etc
Any tips/help much appreciated. Thanks.

You can create 3D SVG: SVG \ Libraries \

Also DXF DXF \ Libraries \

there is also OBJ Nervous System | Tools | OBJExport library for Processing

(all these are on the library page: Libraries \ )

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