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I am having a tough time building a half cylinder and have not found any tutorial showing me how to do that.

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3 Answers 3

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Go into top view (Numpad 7), enter edit mode, press B, and box select half the vertices. Then press X > Vertices. You may need to rotate so that the edges align to the grid properly. Once youhave done that, select the four inner vertices and press F. Alt right-click on the end edges and press F to make faces for them as well.

Half Cylinder GIF

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All the steps below are in front view NumPad 1.

  1. Add a plane
  2. In edit mode move the plane 1 unit along the x axis, G X 1.
  3. Spin the plane with AltR or from the Tool Shelf > Tool tab Spin.
  4. Set the Angle to -180°.

animated gif

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Just to have more options, here's how to do it with curves:

  • On top view add a Curve->Circle.
  • Enter edit mode.
  • With all the handles selected press V to set the control handle type to Free

  • Delete the bottom control point.

  • Select the lower control points and using V convert the handles to vector You should have a curve with the shape of half circle.

  • Exit Edit mode.

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  • Add a Bezier Curve

  • Enter Edit Mode and set the handles to Vector, so you end up with a straight line.

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  • Exit Edit Mode and on the properties window set the Bezeir curve to use the Bezier Circle as Bevel Object.

  • You can then choose to fill the caps or not.

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The main advantage of this workflow is that the curves remain editable and independent so you can keep reshaping/resizing to fit your needs.

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