topic Re: Making a 3d from open line sketch in Fusion Support Forum

Making a 3D object from a open line sketch

Anonymous — Wed, 16 Jun 2021 08:28:05 GMT

I want to create a 3d solid from attached sketch. Tried with pipe, but lines are intersecting with each other. Also tried with extrude, but it only gives height without wide. Any ideas?

Re: Making a 3d from open line sketch

jeff_strater — Mon, 14 Jun 2021 19:13:34 GMT

what do you want the output to look like? You might try TSpline Pipe, but it's not clear that will give you the result you are after.

Re: Making a 3d from open line sketch

Anonymous — Mon, 14 Jun 2021 19:25:50 GMT

i would like the result to be thicker in both X and Z dimensions, so exactly as i could use sweep or pipe functionality.

Betreff: Making a 3d from open line sketch

g-andresen — Mon, 14 Jun 2021 20:17:34 GMT

Hello,
please share the file and explain with a picture of a real object what you want to achieve.

Make sure that the contours do not touch each other at the intersections but swerve in "z" directions.

File > Export > save as f3d on local drive > attach to next post

günther

Re: Making a 3d from open line sketch

jeff_strater — Mon, 14 Jun 2021 20:27:01 GMT

as you've discovered, either Sweep or Pipe will fail on this geometry, as they disallow self-intersecting geometry to be created. TSpline pipe is a bit more forgiving there, but it may have issues of its own. With the model, we can try it.

Re: Making a 3d from open line sketch

Anonymous — Mon, 14 Jun 2021 20:46:27 GMT

TSpline Pipe works great! The only problem i have now is to how to export it as STL, so i could print it.

Re: Making a 3d from open line sketch

Anonymous — Tue, 15 Jun 2021 16:14:59 GMT

Hi Jeff!

Do you know how to turn form into STL?

Re: Making a 3d from open line sketch

jeff_strater — Tue, 15 Jun 2021 20:31:20 GMT

@Anonymous - to save as STL, you will have to first convert the TSpline to a Brep body. As you can see from the browser icon, this conversion has some errors:

If you click on this icon, it will attempt the conversion, which results in this error:

If you zoom into the model, the highlighted faces are self-intersecting. There are several areas like this in the model. I usually find that it is easier to see and deal with self-intersections if you convert to Box mode (in the Display Mode dialog):

If you do that, the self-intersections become apparent:

so, to fix this will require some work. You will need to go into Form and remove the self intersections.

Finally, I notice that you have a LOT of sections in your pipe. Maybe too many. This will make untangling the self-intersections much harder. Try using a lot fewer sections - the fewer the better. Here is a much less dense version of part of this design that is still very smooth: