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So I have this curved pipe made out of a path + bevel + turned curve into mesh.

enter image description here

I need to remove its top part, making at look like an open water slide, something like this:

enter image description here

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  • $\begingroup$ hello, so what about selecting the edge loops and deleting them? $\endgroup$
    – moonboots
    Dec 9, 2022 at 23:53
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    $\begingroup$ Instead of using round bevel for the curve, you could try a bevel object. Then add a solidify modifier $\endgroup$
    – Psyonic
    Dec 10, 2022 at 1:18
  • $\begingroup$ @moonboots that works, but the slide's concave portion doesnt always point up, sometimes it will point down because the curve is probably twisted, how to make the curve points be oriented in a way that this doesn't happen? $\endgroup$ Dec 10, 2022 at 2:12
  • $\begingroup$ You can select individual points and adjust their twist in the 3D Viewport properties panel (not to be confused with the Properties editor). $\endgroup$
    – TheLabCat
    Dec 10, 2022 at 5:52
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    $\begingroup$ @TheLabCat the twist method thing worked $\endgroup$ Dec 10, 2022 at 13:24

1 Answer 1

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If you want, at least, to adjust the basic shape before committing yourself to conversion to a mesh, you can use the 'Half' setting in the Shape panel of your curve and give it a native Round bevel in its Geometry panel...

enter image description here

You will need to adjust the CtrlT Tilt of all the control-points of the spline to -90°, and set the Twist Method to Z-Up, to have the cup face upward, throughout the curve.

enter image description here

Here, shown with additional Solidify, Bevel, and Subdiv. modifiers

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