Line Problem in 3D - How to draw line in 3D?

[dulerong]

Ok guys I know I've posted more than 1 problem per day,

but at least I solved my first question from early in the day.

 

Problem:

I'm trying to create curvature line in 3D, so I'm not in that TOP view anymore.

 

I have two points at different elevation and I'm trying to join them up with a POLYLINE or ARC. Unfortunately, AutoCAD does not let me do this.

 

If I try to do this, AutoCAD lets me snap my line's first point to one of the points at different elevation, but as I try to drag the end point to the 2nd point at a higher elevation, I seem to be constrained to the elevation of the 1st point.

 

So it's like I can only extend my line on the elevation of the first point.

 

I think it's a UCS problem, but I'm not gonna change my UCS everytime I try to do this type of drawing.

 

Anyone has an idea?

 

Thank You

[Organic]

3dpoly is the command you are after.

[Tyke]

Polylines in AutoCAD are by default LWPolylines not even 2D polylines. That means you cannot draw a polyline over 3D points that have differnt elevations. Arcs can also not be drawn over 3D points with different elevations.

 

If you want to do that you must either draw a 3D polyline using the command "_3DPoly" or use a spline. You can create a curved 3D polyline using the command "PEdit", but be warned the curved 3D polyline doesn't pass through all of your 3D points. You can achieve it using a spline if you set the correct properties.

[nestly]

Can you post a drawing, or at least a screenshot showing exactly what you'd like to do.

 

BTW, you can use fillet to draw arc between lines with different elevations, as long as they share a common plane.

[rkent]

Ok guys I know I've posted more than 1 problem per day,

but at least I solved my first question from early in the day.

 

Problem:

I'm trying to create curvature line in 3D, so I'm not in that TOP view anymore.

 

I have two points at different elevation and I'm trying to join them up with a POLYLINE or ARC. Unfortunately, AutoCAD does not let me do this.

 

If I try to do this, AutoCAD lets me snap my line's first point to one of the points at different elevation, but as I try to drag the end point to the 2nd point at a higher elevation, I seem to be constrained to the elevation of the 1st point.

 

So it's like I can only extend my line on the elevation of the first point.

 

I think it's a UCS problem, but I'm not gonna change my UCS everytime I try to do this type of drawing.

 

Anyone has an idea?

 

Thank You

 

You will need to adjust the UCS. Start the UCS command, use the 3point option, pick the two endpoints you are using for your arc, then pick the 3rd point approximately 90 degrees away from the line that would be formed by the two points. Now draw your arc.

[dulerong]

Thanks a lot guys,

 

I ended up using 3DPOLY with SPLINE CV, after adding some points I managed to get a curvy structure.

 

But I think if I wanted REAL Curves, like perfect ones, I'd have to change UCS and do the ARC individually.

 

Correct?

 

Thanks a lot by the way guys!