70000051 Support import and export of STL files

Summary

Support import and export of .stl files

Solution

In version 7002 we added support of one more file format which is .STL files.
STL files are 3D model files that usually contains 3d objects. They are used in 3D printers and other softwares that deal with 3D models.
We support import and export of these files through our SaveAs dialog.
Also we added a new export command in the CommandLine as below.This method can be used to export speciffic polyfaces to stl format.

summary: Exports specified entities into stl format
parameter name="selection": A vdSelection of vdPolyfaces or "USER" , null so the user picks the entities from the screen.
parameter name="filename" : A string with an stl filename or "USER", null so the user picks the filename from a dialog.
returns : True of the operation was succesfull.
public bool STLout(object selection,object filename)

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