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### import DXF form CAD

Posted: **Fri Nov 30, 2018 2:39 am**

by **maxiaofang**

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?

### Re: import DXF form CAD

Posted: **Tue Dec 04, 2018 3:14 pm**

by **escolano**

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.

### Re: import DXF form CAD

Posted: **Fri Dec 28, 2018 4:48 am**

by **maxiaofang**

When I displace it close to the origin, it's OK! Thank you very much!