topic How can I do this in 3D? in AutoCAD Forum

How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 14:55:20 GMT

Hi, I was curious if anyone knew how to create this extrusion in 3D. I have a profile and a series of lines that are not in the same plane and change direction in all three axis and other factors. If anyone can help it would be greatly appreciated.

Re: How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 15:37:57 GMT

Re: How can I do this in 3D?

imadHabash — Wed, 06 Jun 2018 15:50:42 GMT

Hi,

Arcs , Lines and Splines alone and separately can not be extruded . we need to know what is your final shape to give you direct answers regarding your issuw ? 🙂

Regards,

Re: How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 16:06:11 GMT

Thanks for your prompt reply Imad Habash

The final shape is the profile you see on the image at the bottom right and it needs to follow that path as if it were extruded along the path. Yes, arcs, lines, are all separated but the profile needs to follow this path. Its basically a wall molding that follows an arc and walls that go in and out.

Re: How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 17:23:54 GMT

Its a ceiling molding that goes in and out as the wall and ceiling arc. See image. Attached is .dwg file

Thanks

Re: How can I do this in 3D?

Alfred.NESWADBA — Wed, 06 Jun 2018 17:44:15 GMT

Hi,

use command _SPLINEDIT to connect all path objects together to one spline-object.

Then start command _EXTRUDE, select your contour-object, then option _PATH and now select the new spline.

- alfred -

Re: How can I do this in 3D?

john.vellek — Wed, 06 Jun 2018 17:53:40 GMT

Hi @Jorge.Sanchez

I used Extract Edges to get the path for my sweep. Then I execute the sweep, pick your profile and then also indicate a base point.

Let me know if this is what you need and if you need additional description of the process.

Please select the Accept as Solution button if my post solves your issue or answers your question.

Re: How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 20:12:52 GMT

@john.vellek @Alfred.NESWADBA

Hi guys, thanks so much for your prompt responses. A view from below shows that there is an issue and the extrusion profile/shape starts to twist and peel the molding away from the wall and also dig into the ceiling as it follows the path. I would like to maintain the flat surface of the profile/shape against the wall and against the ceiling throughout the whole extrusion. Maybe it has to be done a different way?

Thanks so much for all your help. Please see attached .dwg

Re: How can I do this in 3D?

SEANT61 — Wed, 06 Jun 2018 21:17:24 GMT

This image shows one problem with trying to keep the profile in contact with both the wall and the ceiling.

Re: How can I do this in 3D?

Jorge.Sanchez — Wed, 06 Jun 2018 21:24:04 GMT

Thanks @SEANT61

Could I then just run a separate extrusion for the missing gap up against the ceiling? (see image)

How can I keep the original shape from twisting away from the wall and then just adding an extra piece above just for the ceiling?

Re: How can I do this in 3D?

john.vellek — Wed, 06 Jun 2018 21:47:19 GMT

HI @Jorge.Sanchez,

I am not sure how to recommend proceeding on this. Obviously, a profile can be bent or applied on a curve. It is just when you have such a complex set that it becomes tricky.

i applied your moulding profile on a couple of segments and it can do that fine but where the pieces intersect is where problems arise.

Please select the Accept as Solution button if my post solves your issue or answers your question.

Re: How can I do this in 3D?

SEANT61 — Thu, 07 Jun 2018 09:38:13 GMT

I think the key to creating this Cornice/Crown run, in AutoCAD or in the field, are the transition pieces. See a partial of what I'm getting at in this file. A couple of stretches will require some additional piece to fill gap between crown and ceiling.

Re: How can I do this in 3D?

SEANT61 — Thu, 07 Jun 2018 09:58:52 GMT

In hind sight, I would layout that run differently. That file is still informative, I think, as a demonstration for transition pieces.

Re: How can I do this in 3D?

parkr4st — Sat, 09 Jun 2018 22:55:14 GMT

Attached almost maybe dwg.

Make your profile a bitoversize so it intrudes into the wall and ceiling. save a dwg backup.

SUBTRACT the wall and ceiling from the molding. What is left over should be the piece you are looking for.

The profile and result are off the right in my dwg. Look for a bit of yellow through the top of the ceiling and the weird curves around the circular bends, Those need fixing

dave

I have it close but hope you evaluate my method and if it works complete your dwg.