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CAD tip CAD tip # 3987:

Question CAD 
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Q - question

Intersection osnap does not find the intersection.

A - answer You are trying to snap to an intersection of two line entities but AutoCAD doesn't snap to the intersection point, despite both objects appear to intersect in 2D (and APPINT works fine).

Make sure both objects really exactly intersect in 2D - they may lay in different UCSs or their "zero" Z-coordinates may be just rounded values. Try to temporarily set LUPREC to 8 and issue the LIST command to check exact coordinates.

ACADLTACADMADTMDTMap
100% *  CAD 
26.8.2004    31118×  

See also:
Tip 12766:Lines with a single grip, incorrect osnaps, intersections, offsets, hatches - CheckLarge
Tip 11295:Iterative Move, Scale and Rotate - till boundary touch.
Tip 10383:The shortest path between two points on a network.
Tip 9357:Intersection of a 3D curve with a 3D surface in AutoCAD.
Tip 9030:Precise loading of PDF files into Autodesk Design Review (and PDF-to-DWF)


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