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That's a big ask for a Sunday morning What is the specific context for your request. ?Have you done any CAD work ?added: Welcome to theSwamp.
intersectWith Determines if two lines intersect and if so returns their intersection point. The intPnt parameter is set to something meaningful only if this function returns a value of Adesk::kTrue.
If you are ever in need of further information on a method it's a good bet that there will be more info on the native method in ObjectARXAn example:https://help.autodesk.com/view/OARX/2019/ENU/?guid=OREF-__MEMBERTYPE_Methods_AcGeLinearEnt2dThe doc's are pretty clear on what to do and expect, intersectWith is basically vector math equation to determine where 2 linear entities intersect, you can then extend a line to that intersection by setting the end point to the intersection point.Quote intersectWith Determines if two lines intersect and if so returns their intersection point. The intPnt parameter is set to something meaningful only if this function returns a value of Adesk::kTrue.<aside> I honestly don't know why they haven't merged this info with the .Net doc's...
When you've downloaded the OBJECTARX API you'll find some excellent CHM files in the docs folder ... much nicer than the html web offering.https://www.autodesk.com/developer-network/platform-technologies/autocad/objectarx-license-download