Fortran is a long-lived programming language for scientific computing

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Fortran 90 - How to create a coordinate system

So I need to code a simple program, and I need to define 2D coordinates? Is there any coordinate system I can use in Fortran? I was told it might have to be all in arrays? And if so, can anybody ...
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Test if a point is inside or outside a 3D polygon

I'm wondering if there is an algorithm (or a code written in FORTRAN) that gives whether a 3D point is inside or outside a polygon having triangles as faces (an .stl file from gmsh for example). Most ...