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I trying to make a rib that follows the edges of the column, but it doesn't work the way I wanted it. How am I supposed to know how much I need to turn the bevel object to get the desired effect? I don't wanna change the location or rotate the curve because it would be later hard to fit it perfectly into the vault. Or maybe there is a different way to do it? enter image description hereenter image description hereenter image description here

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  • $\begingroup$ I have the vault already build, I just hid it. The curve is extracted from the vault. I will draw how the ribs should join with the column to make the problem more understandable. $\endgroup$
    – Adela Lazur
    Dec 14, 2020 at 15:52
  • $\begingroup$ I guess the only solution is to do it in sketchup... $\endgroup$
    – Adela Lazur
    Dec 19, 2020 at 17:32
  • $\begingroup$ My humble apologies for the previous answer.. completely wrong. I'd misread, and was thinking of deforming an object down a curve. I hope the rewrite, about profiles, helps. Sorry if I've wasted your time. $\endgroup$
    – Robin Betts ♦
    Dec 21, 2020 at 10:08
  • $\begingroup$ It is OK, I appreciate all the efforts. $\endgroup$
    – Adela Lazur
    Dec 21, 2020 at 23:43

1 Answer 1

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For a Bevel-Object swept along a curve-path, the rules are:

  • The Bevel Object will be projected down its own positive Z axis.. its own positive Z is 'Front', as it travels down the path.
  • It doesn't matter where the path's object-origin is.
  • It doesn't matter where the the Bevel-Object is in the world. Its object-origin will lie on the path, when projected, (assuming no Offset in the path's Data > Extrude panel).
  • 'Up', with respect to the path's normals, will be the Bevel-Object's own positive Y axis
  • 'Right', looking down the path's direction, will be the Bevel-Object's own positive X axis.

enter image description here

This is quite hard to illustrate clearly. I suggest moving the profile-curve to somewhere it's convenient to work with, maybe the World origin, and switching on the display of the path's normals in its Edit Mode, in the Overlays dropdown.

First check that the path's normals are left-to right, at right-angles to your desired 'Up'. Setting its Twist Method to 'Minimum' in its Data > Shape panel should do that.

Then rotate the profile in Edit mode, so it's flat in XY, and its top is pointing down its own positive Y axis. In the profile's Object > Viewport Display panel, you can switch on 'Axis', as above, to reassure yourself of the alignment.

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  • $\begingroup$ I added a file that contains the problematic vault and column. However I must say I am still a nub in blender and I din't understand all of your advices. $\endgroup$
    – Adela Lazur
    Dec 20, 2020 at 20:01
  • $\begingroup$ After applying your answer. It almost look the way it suppose to... I think the problem is here about matching the column because column is 45, but the vault is not perfect square. I will add pictures. $\endgroup$
    – Adela Lazur
    Dec 21, 2020 at 23:06

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