Creating a 3D solid from 3D lines

[Anonymous]

Hi I'm trying to create a solid object o use in my section views in civil 3d.

I usually use google sketchup for these kind of drawings, It's easier than autocad I guess. But this time I need to use it in Civil3D section views. Also I have to learn how to do it in Autocad, I was avoiding it all these years because there was an easy way..

I used loft command to connect 2 faces, but between those surfaces there is a gap. I want to fill there and make it a solid object.

How can I do this? or is there a faster way from the beginning?

Thanks..

[Alfred.NESWADBA]

Hi,

>> I used loft command to connect 2 faces, but between those surfaces there is a gap

Are the polylines you used for command _LOFT closed? If you they should get 3D-Solids, not surfaces. And after that run command _SUBSTRACT.

If the lofting/extrusion is vertical to the section the easiest approach would be to use _PRESSPULL as shown in the attached video.

- alfred -

[Anonymous]

No, they are not vertical. There is a 72cm elevation difference in 50 meters

Yes, they are closed polyline but I get a surface instead of 3d solid.

[Alfred.NESWADBA]

Hi,

>> Yes, they are closed polyline but I get a surface instead of 3d solid

"Closed" means the property window show "closed" = "yes" ... or are just the endpoint of the polyline at the same geometry position as the startpoint (then it's technically not closed).

When you start command _LOFT (using keyboard and type in the command ... and before selecting the polylines) use option _MODE and make sure it's set to 3DSOLID

- alfred -

[Anonymous]

I do select Solid but it doesn't change. Could you check my drawing?

Thanks..

[Alfred.NESWADBA · Accepted solution]

Hi,

your polylines are "3D-Polylines", not the normal polylines.

Recreate the polylines (2D, using UCS for each of the sections), then you can get 3D-Solids from _LOFT

- alfred -

PS: please don't use AutoCAD 2018 and save by default to DWG2013 format!

[Anonymous]

Ah I didn't know that, thanks a lot..

But I didn't understand what you mean by saving DWG2013

Most people still don't use 2018 so I save as 2013 dwg, what's wrong with that?

Thanks again..

[Alfred.NESWADBA]

Hi,

>> Most people still don't use 2018 so I save as 2013 dwg, what's wrong with that?

Working with AutoCAD 2018 means the internal AEC-objects are updated and can't be converted back for older AutoCAD's.

So when you save your work as DWG-2013 and anyone with AutoCAD 2013 opens your drawing he might get compatibility issues, that's why you get that message when you use _SAVEAS and select an older dwg-format:

Stay with your work at DWG-2018 format, when anyone else needs this in an older format he/she can use Autodesk DWG TrueView to convert the file or you can use command -EXPORTTOAUTOCAD to create a copy or your drawing, but never save your project to an older format.

- alfred -