import DXF form CAD

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maxiaofang
Posts: 1
Joined: Fri Nov 30, 2018 2:08 am

import DXF form CAD

Postby maxiaofang » Fri Nov 30, 2018 2:39 am

DXF files are polylines in CAD. After importing GID, polylines become a lot of small segments. Why are polylines broken? When I combine these small segments into a set of curves, I cut the set of curves with a plane, and the intersection point is not completely within the plane, what should I do?
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escolano
Posts: 1489
Joined: Thu Sep 18, 2014 3:31 pm

Re: import DXF form CAD

Postby escolano » Tue Dec 04, 2018 3:14 pm

In GiD is better (for several algorithms) to handle each segment as a individual curve instead of define all of them with a single curve (NURBS or poly-line) with 'inner corners'.

The intersection of a curve with a surface is calculated numerically. In any case a point is 'on a surface' with a tolerance.

Maybe your model is displaced far from the origin (0,0,0) and then the accuracy is worst?
(e.g. a classical case of level curves of a topography expressed as UTM coordinates)
Then maybe you can displace it close to the origin, at least temporarily to do geometrical operations.

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