# Boolean Union + Split problems

**URL:** <https://discourse.mcneel.com/t/boolean-union-split-problems/69252>\
**Category:** Rhino for Windows\
**Created:** [August 21, 2018, 4:02pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252 "2018-08-21T16:02:08Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![sri.c.gowda](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/sri.c.gowda/32/112237_2.png) [@sri.c.gowda](https://discourse.mcneel.com/u/sri.c.gowda)\
**Post date:** [August 21, 2018, 4:02pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/1 "2018-08-21T16:02:09Z")

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Hi guys,

I am having difficulties trying to boolean join two surfaces together. I’ve looked at the intersect feature and they do indeed intersect and it shows me the resulting curve. Yet, when I try to boolean them together it is unable to do so.

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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:** [August 21, 2018, 4:03pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/2 "2018-08-21T16:03:56Z")

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Hello - Please attach a file with the two objects or send to [tech@mcneel.com](mailto:tech@mcneel.com) if the file is confidential.

-Pascal

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**Author:** ![sri.c.gowda](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/sri.c.gowda/32/112237_2.png) [@sri.c.gowda](https://discourse.mcneel.com/u/sri.c.gowda)\
**Post date:** [August 21, 2018, 4:17pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/3 "2018-08-21T16:17:34Z")

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[Rhino\_Tutorial\_3 (1).3dm](https://global.discourse-cdn.com/mcneel/uploads/default/original/3X/c/e/ce98cbe180ffd3b90df0d6efe1e9f85497cb00f0.3dm) (3.9 MB)

I am trying to boolean union the object in yellow and green first. then join the object in pink to the first set of boolean union

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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:** [August 21, 2018, 4:25pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/4 "2018-08-21T16:25:23Z")

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Hello - the yellow object has multiple coincident faces - you’ll want to explode and simplify that.

@sri.c.gowda - see

-Pascal

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**Author:** ![sri.c.gowda](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/sri.c.gowda/32/112237_2.png) [@sri.c.gowda](https://discourse.mcneel.com/u/sri.c.gowda)\
**Post date:** [August 21, 2018, 4:43pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/5 "2018-08-21T16:43:09Z")

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I’m not sure I understand. Can you explain how to do that?

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**Author:** ![sri.c.gowda](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/sri.c.gowda/32/112237_2.png) [@sri.c.gowda](https://discourse.mcneel.com/u/sri.c.gowda)\
**Post date:** [August 21, 2018, 4:57pm UTC](https://discourse.mcneel.com/t/boolean-union-split-problems/69252/6 "2018-08-21T16:57:16Z")

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Thank you!