There's nothing for creating multiple offsets at this time, but you could
(a) write something pretty quick in VBA, or (b) just use Offset. Offset
offsets the entire alignment (with curves if there are any) and makes a
pline on the current layer.
James Wedding, P.E.
Jones & Boyd, Inc.
XP/2 on P4-3.4/1G
Hi!!. When I offset using AutoCAD offset command, the offset of spiral divides in a lot of entities. Is possible to list the length of an offset of a spiral?? In Land/Civil exists a command to offset an alignment. Thanks.
Theoretically, a perfect offset of a clothoide curve does not exist and all
a CAD program or a construction crew can do is to approximate the clothoide
by a chain of straight lines or arc segments.
In LDT, spiral offset was easier to do because spirals were polylines
anyway. Not the case in Civil3D.
Nevertheless, by using AutoCAD offset command in Civil 3D you are getting
the same quality of results as you did in LDT.
Try exploding the offset once and examine the spiral segment for length.
"JoaoMM" wrote in message
> Hi!!. When I offset using AutoCAD offset command, the offset of spiral
> divides in a lot of entities. Is possible to list the length of an offset
> of a spiral?? In Land/Civil exists a command to offset an alignment.
I know that theoretically, a perfect offset a clothoid curve does not exist. In land I have a possibility to extract information about a "offset of clothoid" and to manage them (tangent to entity, attach, etc). In land, i confirmed, and the Length of a offset of a spiral is Length=l-al^2/4A^2 where:
a=2*distance to offset
A=parameter of a initial clothoid
l=length of initial clothoid
Sometimes I have my alignment defined with a "offset to a clothoid" and king of information is useful.In Civil3D I think that is not possible to manage and extract information about this kind of entities??
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In CIVIL3D ??????
In Civil 3D with the available alignment APIs, this is a very easy item to
The necesasry code is:
Set NewAlignment = AlignmentOhject.Offset Distance
.Layer = "WhateverLayer"
.... other setings as desired
It could be included as a feature of an upgrade to our Advanced Road Design
program, - but as it is not needed by ARD there is no high priority to write
the code to do it.
Also, you have to consider whether Civil 3D actually needs to be able to
draw offsets as the plotting of the road comes from the corridor object.
www.cadapps.com.au wrote in message news:firstname.lastname@example.org...
I can't remember if it is still there in 2006, but in 2004 there is a
command on the Alignments pull down menu called "Create Offsets..." This
works really well for what you are looking for.