# Translate polycurve to planes at parameter

**URL:** https://forum.dynamobim.com/t/translate-polycurve-to-planes-at-parameter/12377
**Category:** Geometry
**Created:** [June 10, 2017, 8:13pm UTC](https://forum.dynamobim.com/t/translate-polycurve-to-planes-at-parameter/12377 "2017-06-10T20:13:27Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![Kenyon\_Graham](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/kenyon_graham/32/8837_2.png) [@Kenyon\_Graham](https://forum.dynamobim.com/u/Kenyon_Graham)
#### Post date: [June 10, 2017, 8:13pm UTC](https://forum.dynamobim.com/t/translate-polycurve-to-planes-at-parameter/12377/1 "2017-06-10T20:13:27Z")

</div>

Hi,

I’ve been running into a problem with a U frame polycurve that i have generated.

I have generated simple line geometry to model: Top flanges, web plates and bottom flange of a steel u frame bridge.

geometry has been generated based on:

- an initial u frame from the required dimensions ( a sort of bounding box approach)

- top flanges for two extents ( the flange offsets may be asymmetrical) currently symetrical

- girder webs, where i have input some points at parameters for use later, I’ve been deliberate here with order.

- Bottom flange…a wide bottom flange with some points required for detail

I then generated a series of lines to make up a polycurve which I have been trying to translate the geometry onto a plane at parameters on a nurbs curve.

I’m a little perplexed, I was looking to create a group from the poly curves, translate onto the planes on the nurbs curve, unfortunately I seem to have a another knowledge gap.

The cross section that I am trying to model is this:

![](https://cdck-file-uploads-us1.s3.dualstack.us-west-2.amazonaws.com/flex022/uploads/dynamobim/original/3X/e/4/e4d4975a61dff04581b9c19a9d40354adebd511f.png)

It was relatively straight forward with a series of rectangles where the planes were easily defined. I was thinking that the polycurve could be considered in the same manner as the rectangle, but it appears not that straight forward.

My plan was to project the polycurve onto a series of planes at parameters, works with a rectangle but I cannot seem to get the polycurve to be positioned on the planes possibly as its a compound curve?

[U\_Frames\_NR\_Rev\_E.dyn](https://forum.dynamobim.com/uploads/short-url/oNwHmmyT3fO9zLQVDMuYuhQDxo.dyn) (73.4 KB)

Any help appreciated.

regards

Kenyon