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Intersecting 3D lines no longer intersecting after copying to another file
Hello,
I am experiencing some precision issues with intersecting lines in 3D. While creating my original model, I've always used snapping tools so all lines nicely intersect when they're supposed to. I copied my model into another file a while ago, and now noticed that the majority of these lines no longer intersect. In a lot of nodes where multiple lines or planes are supposed to come together, these lines or planes are now somehow detached.
The video below shows this for just one example. At first, I zoom in on a node in the original file. After a lot of zooming, the visualization is a bit buggy, but by selecting the lines it's clear that all lines still intersect in the same node. Next, I zoom in on the same node in my second file, where it becomes clear that the node suddenly split up.
https://www.youtube.com/watch?v=5wVNbzIlzik
The reason why this is problematic for me is that I'm working with a lot of 3D planes with 4 nodes, so if one of these nodes move even a little bit from their original intended position (or if I try to draw a new 4-node plane and unknowingly snap to such a displaced node), the 4 nodes no longer lie on the same plane, and I can no longer extrude the plane as a solid object. I also want to export the model to structural software in the end, so it's important there are no tiny gaps between planes since this would interrupt the force transfer unknowingly.
If anyone knows more about this issue or how to deal with it, I'd be very appreciative.
I'm using Autodesk AutoCAD 2020 - student version, Windows 10 Home 64 bit.
Thanks in advance
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Hi,
it's usually happened if you're working far a way from 0,0,0 coordinate .
can we have a CAD dwg please , just a little lines for testing ?
Imad Habash
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Thanks for your reply, that's good to know. I'll probably re-do everything I did in my second file but stay close to the origin of the frame of reference. I included the two files to this post. "Workshop v5-P.dwg" is the original file without the issue, "Pylons v6-P.dwg" is the second file with the problem.
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Hi,
change the visual style in the drawing with the issues to "2D Wireframe", you also can use command _GRAPHICSCONFIG to turn off hardware acceleration, this reduces the effect you are having on the display.
But to make sure ... the zoom depth you are using is far beyond the possibilities of double precision calculation. When you are zoom that close to an endpoint, you even can't see a coordinate difference between your left and right border of your display (try it, zoom in that close, start command _DIST and then pick a point on the left side of your display and then on the right side ... I bet the distance you get as result is 0.00000).
Zooming more and more close does not make a sense and is reaching then the physical end of the display list, that's why you see the jumping graphics.
- alfred -
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
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(not an Autodesk consultant)
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The visual style in the problem file is already set to '2D Wireframe' (the visual style wasn't visible in the video).
The problem isn't the zooming itself though, the nodes which are supposed to coincide (and which do in fact coincide in the original file) no longer coincide in the problem file, so they've actually displaced. As a consequence, some sets of 4 nodes in a plane which originally formed a plane, no longer lie in the same plane.
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Hi,
can you then try to
- _WBLOCK ... to save your geometry as temporary dwg
- _INSERT to insert the geometry from your temporary dwg into the other working drawing?
- alfred -
Alfred NESWADBA
ISH-Solutions GmbH / Ingenieur Studio HOLLAUS
www.ish-solutions.at ... blog.ish-solutions.at ... LinkedIn ... CDay 2025
------------------------------------------------------------------------------------
(not an Autodesk consultant)