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How can I make a Bézier curve into a 3D-noodle-like structure (like a tube)? When I try, it keeps turning out like a rectangle with corners.

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Did you see there is a way to make a tree with a built-in addon in Blender? See here: blender.stackexchange.com/questions/8688/… –  Thom Blair III Apr 18 at 2:27

2 Answers 2

up vote 7 down vote accepted

To make a tube, set the Fill to full in Curve > Shape:

enter image description here

Then increase the bevel Depth and Resolution in Curve > Geometry:

enter image description here

If you want a more complex/custom shape, you can use a bevel object:

enter image description here

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Thanks so much!!! I had everything right except the resolution lol. Also how do I make it branch off? –  Zachooz Apr 18 at 1:32
    
I just duplicated a segment and then extruded it in another direction. This will work as long as you don't mind the branches not actually being connected to each other, but if you do want them connected, you might want to try using a mesh object with a skin modifier. –  gandalf3 Apr 18 at 1:34
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It would be better if you asked this as a separate question, asking multiple questions per post is discouraged. –  gandalf3 Apr 18 at 1:45

Make a Curve into a Tube

  1. Add a Curve: SHIFTA -> Curve -> Bezier

    enter image description here

  2. Now add a Circle Curve: SHIFTA -> Curve -> Circle

    enter image description here

  3. Now use the circle as the bevel object for the bezier curve:

    • Select the bezier curve

    • Object Properties window -> Curve tab -> set Bevel Object to the circle

    • Scale the circle until the tube is the size you want

    enter image description here

  4. If you would then like to edit the shape of your tube, just edit the Bevel Object, which here is the circle:

    enter image description here

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