# Subtracting A Half Sphere From A Cylinder

**URL:** <https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061>\
**Category:** Modeling Questions\
**Created:** [September 27, 2021, 4:31am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061 "2021-09-27T04:31:41Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ChloZ](https://avatars.discourse-cdn.com/v4/letter/c/f1d935/32.png) [@ChloZ](https://discourse.shapr3d.com/u/ChloZ)\
**Post date:** [September 27, 2021, 4:31am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/1 "2021-09-27T04:31:41Z")

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I am trying to subtract (or concave; whatever can work) a 1/2 sphere from a cylinder to create a bowl shape, but as can be seen in the picture, it is not working well for me. I would love if anyone can help.

As for the option on the subtraction tool, I chose to keep the + bodies.

EDIT: Because I can only upload 1 picture as a new user, the “1/2 Sphere” is the top cylinder in which the bottom face was convex’d into the shape of a half sphere, and is currently unseeable in the picture; it is going into the + body.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/d/dcf0e6d53f1b3932028b336fb6b6231148cdc12c.jpeg)

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [September 27, 2021, 5:20am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/2 "2021-09-27T05:20:14Z")

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Before we trouble shoot this, tap the front or a side view, and touch the cross section to ensure it’s not working correctly. Sometimes the half sphere is difficult to see when removed.

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [September 27, 2021, 5:23am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/3 "2021-09-27T05:23:25Z")

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Here is video clip where I made the sphere red and the cylinder blue. Even when the half sphere is red, it is difficult to tell it’s a bowl. [iCloud](https://share.icloud.com/photos/0c6BjyyID0SUPPLhl4Ji14EjA)

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**Author:** ![ChloZ](https://avatars.discourse-cdn.com/v4/letter/c/f1d935/32.png) [@ChloZ](https://discourse.shapr3d.com/u/ChloZ)\
**Post date:** [September 27, 2021, 9:28pm UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/4 "2021-09-27T21:28:40Z")

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Sorry for the late reply, busy student stuff. But the cross section view is blank, empty. I am viewing from the “right” side so without cross section, it is a rectangle (as a cylinder is if you view it from a side; big surprise). I screenshot’d the message on top to help you confirm if I had followed your troubleshooting step.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/2X/9/95c0c3145d8253602b5db792a531d53d943b0247.jpeg)

EDIT: Having watched your video more times than I’m proud to say, I can safely say I have no idea when you did to get the program to do what it did.

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<div class="post-metadata">

**Author:** ![ChloZ](https://avatars.discourse-cdn.com/v4/letter/c/f1d935/32.png) [@ChloZ](https://discourse.shapr3d.com/u/ChloZ)\
**Post date:** [September 28, 2021, 4:57am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/5 "2021-09-28T04:57:51Z")

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**SOLUTION**  
After some playing around, I realized another object was created, and it contained the cylinder with a bowl. So the solution was that the subtraction was working, and I just did not understand how keeping the + body negatively impacted my perception. So for cases like this, don’t keep any original bodies lest you end up like me, frustrated for 2 days.

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**Author:** ![McD](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/mcd/32/15504_2.png) [@McD](https://discourse.shapr3d.com/u/McD)\
**Post date:** [September 28, 2021, 5:55am UTC](https://discourse.shapr3d.com/t/subtracting-a-half-sphere-from-a-cylinder/15061/6 "2021-09-28T05:55:19Z")

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Glad you discovered the cause!