3D Offset

[beyag]

Hello Everyone, 
Is there a way to offset a 3D Polyline ? 
with offset slope (%) and horizontal distance (meter) , as user input.
Thanks in advance.

[Emmanuel Delay]

Could you upload a drawing that shows the desired outcome?

[beyag]

3D_Offset.dwg

[beyag]

There are Autocad add-ons that are able to do this. 
The problem is that I don't always have access to those add-ons.

[lrm]

The following process is tedious but will yield the desired result (I think).

1. Working on a new layer create 4 lines snapping to the vertices of the 3dpoly.
2. Move the 4 lines in Z by - 2.5 (  50% x 5m offset distance).
   
3. Select one of the lines and use UCS OB to set a ucs for the line.
4. Use Offset with a distance of 5.
5. Repeat steps 3, 4, and 5 for the other edge lines.
6. This will yield the lines shown in green below.
7. 
8. Use chamfer to complete the 3D offset.
9. 

 

[beyag]

Thanks for the reply,
In this example it was a simple shape ( rectangle) 
But, if it's a more complex shape , with more vertices , it would be impossible to follow the steps you showed.

[BIGAL]

For say road kerbs our surveyor would pick up road edge, then add the back of kerb so it is probably easier to off set correct distance then move vertically a % or ht.

 

[beyag]

 
This video shows how I usually get it done.