As described in https://help.autodesk.com/view/INVNTOR/2023/ENU/?guid=GUID-68FCAD0E-93BD-4D90-B9FE-9CF82AA4E64D, there are several global options for adjusting how Inventor triangulates surfaces when exporting to STL. These allow one to create an STL with few or many triangles:
For some applications (particularly using STL triangles in non-Autodesk simulations), it is critical to control the triangulation on various surfaces in the model. In principle, the existing global settings permit this. However, there is often also a constraint on the total number of STL triangles. At the moment, Inventor forces one to choose a single set of global triangulation parameters to balance these two needs.
My suggestion is to borrow a feature from elsewhere in Inventor to let the user locally alter the triangulation parameters for any face or set of faces. This would be nearly identical to the Local Mesh Control tool in the Stress Analysis Environment. See https://help.autodesk.com/view/INVNTOR/2023/ENU/?guid=GUID-B73B2C75-4AA4-4F9E-9BC4-4AB8D26C1765 for details. Here is the example part from above with a locally-adjusted Stress Analysis mesh that illustrates the kind of changes that the new local-STL-triangulation tool would permit:
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