Centerline between two 3D lines

[k_l_raghava]

Hi,

Need Help in getting Centerlines between 3D polylines(road edge lines).

Annotate-> Centerline command not recognizing the 3D polylines as a line (even tried flatten command on those but still same issue).

form my knowledge the option i have made is making lines joining the vertices of selected (parallel/non parallel) lines and drawing the perpendicular to second one in the pair and then joining the center points to get center line.

Can any one suggest a lisp - as my total polylines length is about 400 kms (800 kms of road edge lines).

attached is a sample bit of problem drawing.

Thanks in advance.

[dlanorh]

This may be helpful. Follow the link in the last post HERE

[ВeekeeCZ]

Just tested quickly. 

You still need to flat them, explode and rejoin to get lwpolylines.

btw the routine was also posted HERE 

[k_l_raghava]

is there no option without converting to LWpolylines ??

as i explained, my drawing is covering a big city roads, if i explode-flatten-join it is almost impossible task.

can there be a routine to average the verticies z value and average them to give the z value in center line vertex.

[ВeekeeCZ]

You know what... better get some better computer because converting polylines it's a piece of cake comparing to processing algorithm finding their centrelines.

The truth is, that rather than exploding and rejoining workflow would be more efficient to do the job directly - maybe THIS  routine by _gile.

[vladimir_michl]

If I understand the question, it is not about a centerline symbol but rather about an axis curve (an average curve between 2 existing curves). The CurveAxis LISP tool (freeware) supports also 3D curves.

See CAD Forum - How to create an axis of two curves? (average curve)

Vladimir Michl, www.cadstudio.cz - www.cadforum.cz

[Kent1Cooper · Accepted solution]

See the accepted solution in the other thread in which this is one part of the topic.