What are you using to test for the intersection of the spline curves in AutoCAD?
@wim opened the DWG in Rhino to test that geometry that was exported did intersect. That was a helpful test.
The AutoCAD Intersect command requires at least 2 solids, surfaces, or coplanar regions. It does not work on curves or splines.
What AutoCAD version are you using? And what command in AutoCAD are you using to test for curve intersection? Do you have a LISP file or something that you can share with me?
You can use the AutoCAD Intersection osnap to snap a end point of the line or other point, but it will only work on objects that intersect, are coplanar and their cplane is current.
Also the Apparent Intersection osnap will snap to the projected or “apparent” intersection to the current ucs, not the intersection in 3D space.
Please send more details about how you are testing for curve intersection in AutoCAD.
Mary Ann Fugier
McNeel Technical Support and Training