# Cannot Intersect or do much of anything

**URL:** <https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836>\
**Category:** Rhino for Mac\
**Created:** [October 20, 2016, 4:08am UTC](https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836 "2016-10-20T04:08:17Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bigjimslade](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/bigjimslade/32/62775_2.png) [@bigjimslade](https://discourse.mcneel.com/u/bigjimslade)\
**Post date:** [October 20, 2016, 4:08am UTC](https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836/1 "2016-10-20T04:08:17Z")

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In the attached I have an extrusion and a sweep1 of a rectangle that has been capped.

For some reason I cannot do a boolean intersection on the two.

Why is this the case?

[Intersection.3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/c/0/c07e6e4bdaa3a663a45650d206edd4f83045987f.3dm) (719.2 KB)

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**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [October 20, 2016, 4:19am UTC](https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836/2 "2016-10-20T04:19:12Z")

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Hi Jim - for some reason the skinny thing has a single kinked surface along its length - use `DivideAlongCreases` on that and it should all work better. But, is `CreaseSplitting` set to yes in your Rhino?

-Pascal

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<div class="post-metadata">

**Author:** ![bigjimslade](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/bigjimslade/32/62775_2.png) [@bigjimslade](https://discourse.mcneel.com/u/bigjimslade)\
**Post date:** [October 20, 2016, 12:45pm UTC](https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836/3 "2016-10-20T12:45:39Z")

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The next question would be why a sweep of a rectangle along a line would create something odd (see attached).

Where would CreaseSplitting be set?

[Intersection.3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/2/f/2f495dc05c63cd93b51f9ff27687a30550193584.3dm) (704.3 KB)

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<div class="post-metadata">

**Author:** ![pascal](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/pascal/32/479395_2.png) [@pascal](https://discourse.mcneel.com/u/pascal)\
**Post date:** [October 20, 2016, 3:06pm UTC](https://discourse.mcneel.com/t/cannot-intersect-or-do-much-of-anything/37836/4 "2016-10-20T15:06:58Z")

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Hi Jim - `CreaseSplitting` is a command - on Mac, you want the ‘Split along creases’ item to be checked.

-Pascal