Stepped offset 3d polyline

[Anonymous]

Hello everybody,

I have the following problem. I want to use Stepped Offset to offset a 3D polyline (it is a closed 3d polyline - rectangle) and I want the new 3d polyline to maintain the same gradient (is this the correct term?) with the original one.

To help you visualize what I mean think that when I choose the Back or Front View of the polylines the must be colinear.

I tried using various values for Grade, Slope, Elevation and Elevation Difference but none had the desired effect.

Do you know any other way that may lead to the same results?

Thank you.

[Joe-Bouza]

thta sounds like a sted offset of zero elevation fifference to me. If you are offseting Polgon ABCD to abcd , by vitue of the shortening of lines AB to ab and CD to cd the gradient cannot be the same. If I undrstand correvtly

[antoniovinci]

@ Joe

You'd better change your keyboard, man...

@ Iraklis

A rectangle is NEVER a 3D polyline, but only a normal 2Dpoly with elevation: please attach a screenshot about your goal, thanx.

[wfberry]

The easy way:

Change your 3D poly to a Feature Line.  You can maintain the slope OK, but obviously your corner points will have to be set to different elevations.  Use the feature line editor.

If you HAVE to have a 3D polyline, explode the Feature Line when you have what you want.

Bill

[Joe-Bouza]

The collinear request  make things mathematically, troubling

[Joe-Bouza]

typing in the dark is'nt a good excuse either

[Anonymous]

OK let me put it another way.

I have a 3D polyline that is of rectangular shape. See the attached DWG.

I use the Stepped Offset tool provided in the Feature Line Toolset (I use Civil 3D 2010).

I enter the offset value, I pick the object and the side to offset and then it asks for Slope, Grade etc.

What I want to achieve is that the new offset 3D polyline is a 3D extension of the original one, meaning that when I look at them from a side view (Front or Back in Civil 3D) they appear to be colinear and not at diferrent elevations as they appear in the following image.

I want them to appear as one like below

Please keep in mind that I have around 2000 objects that I want to perform this action.

Thanks again.

[Jeff_M]

Using the option Elevation Difference with a value of 0 doesn't do what you wish?  No, I see now, after testing it, that it doesn't.....

[Joe-Bouza]

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@Anonymous wrote:

OK let me put it another way.

I have a 3D polyline that is of rectangular shape. See the attached DWG.

I use the Stepped Offset tool provided in the Feature Line Toolset (I use Civil 3D 2010).

I enter the offset value, I pick the object and the side to offset and then it asks for Slope, Grade etc.

What I want to achieve is that the new offset 3D polyline is a 3D extension of the original one, meaning that when I look at them from a side view (Front or Back in Civil 3D) they appear to be colinear and not at diferrent elevations as they appear in the following image.

I want them to appear as one like below

Please keep in mind that I have around 2000 objects that I want to perform this action.

Thanks again.

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To paraphrase Stan Lee: Nuff said