# Multiple contour curves with polysurface

**URL:** <https://discourse.mcneel.com/t/multiple-contour-curves-with-polysurface/83083>\
**Category:** Rhino Developer\
**Created:** [May 10, 2019, 8:37am UTC](https://discourse.mcneel.com/t/multiple-contour-curves-with-polysurface/83083 "2019-05-10T08:37:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![o11225669](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/o11225669/32/135721_2.png) [@o11225669](https://discourse.mcneel.com/u/o11225669)\
**Post date:** [May 10, 2019, 8:37am UTC](https://discourse.mcneel.com/t/multiple-contour-curves-with-polysurface/83083/1 "2019-05-10T08:37:59Z")

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Hello, I’m trying to retrieve contour curves between a polysurface and a plane.

The method _Brep.CreateContourCurves_ works fine but I’d like to get the curves per every surface in the polysurface.

Sorry, english isn’t my main language, I prepared some screens to better show the situation:

 ![1](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/c/e/ce7cdb43deea4bf14019313d7f6b42580489546a.jpeg)

If I intersect the polysurface and the plane I get one single curve

 ![2](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/6/b/6b8d02d1733a32b8c550d598b4a9522922356461.jpeg)

But my original polysurface is made of three surfaces. Would it be possible to get the curves for each surface even if they are joined in a single polysurface?

 ![3](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/3/b/3b3295e48e40956a3fc05207b08fd8be2f4e0fdf.jpeg)

I think I can probably access underlying surfaces using Brep.Surfaces and then make it work from there by first testing bounding boxes for intersection then getting the curves but I just want to be sure I’m not reinventing the wheel.

Thanks in advance!

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**Author:** ![dale](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/dale/32/685184_2.png) [@dale](https://discourse.mcneel.com/u/dale)\
**Post date:** [May 13, 2019, 5:19pm UTC](https://discourse.mcneel.com/t/multiple-contour-curves-with-polysurface/83083/2 "2019-05-13T17:19:15Z")

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Hi @o11225669,

Does the results of the contour produce a polyline? If so, then just split up the polyline at it’s vertices.

– Dale

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<div class="post-metadata">

**Author:** ![o11225669](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/o11225669/32/135721_2.png) [@o11225669](https://discourse.mcneel.com/u/o11225669)\
**Post date:** [May 14, 2019, 4:11pm UTC](https://discourse.mcneel.com/t/multiple-contour-curves-with-polysurface/83083/3 "2019-05-14T16:11:37Z")

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I feel stupid now, it was so simple. Thank you!