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I don't quite get what's going on. I tried everything: applied rotation, scale, tried re-making the geometry, and nothing works. Could it be that a slight misplacement of a vertex causes such a dramatic change in bevel? It makes no sense. This was created from being mirrored, but it won't apply right. I tried all modes, which I will show below. There is only one that works, but since it doesn't apply it evenly to the bottom portion, I cannot use it as it destroys the top. I need this in order to get the profiling right (otherwise it shows an ugly, impartial application which I demonstrate below as well).

Here are the different types of modes of bevel that I tried (note that they're exaggerated to show how they are unevenly applied).

Offset (note the twisting of one side and another side's disproportionate look): enter image description here

Width (it looks OK, but it's not when the bevel is applied in excess because it shows that not everything is scaling in the same amount): enter image description here

Depth (really weird--should not be such a dramatic difference!): enter image description here

Percent (this is the only one that works relatively better, but it applies most heavily at top, whereas I need it to be applied to the bottom evenly, too): enter image description here

Here's the reason for why I need the bevel: enter image description here

Here's what happens when bevel is applied: enter image description here Any advice is greatly appreciated!

Note that the file is found here:

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    $\begingroup$ can you share us your .blend file? blend-exchange.giantcowfilms.com $\endgroup$ – Michael Ben David Feb 21 at 6:31
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    $\begingroup$ @MichaelBenDavid sure, here: blend-exchange.giantcowfilms.com/b/5903 P.S. I know that there is geometry going through geometry. I'm not worried about that because it's never seen by the eyes. I just need to bevel the thing :\ If you need the WHOLE file where this fits, let me know--I cut away everything that doesn't belong to this exact problem. And thank you for your response! $\endgroup$ – Lucidity of Power Feb 21 at 7:07
  • $\begingroup$ Just making sure we understand the problem: 1. You want to bevel the 'spokes' where the arch-prisms join. 2.You want the width of the bevels to conform to the width of the molding all the way along their lengths? $\endgroup$ – Robin Betts Feb 21 at 9:04
  • $\begingroup$ Yeah, I guess that's it? The goal is that I need it to be level to the wall on the back side, yet connect to the profile so that it looks as though they're one piece with the vault (see last image in my post), and since I don't know a better way to do it, I have to manually tweak it so that the profiling isn't too protruding (or my other profiles/pillars that rise up and connect to those "spokes" are too far apart on the X axis for me to make it look good when connected with another object) -- (like a sphere, which then has to be really fat to accommodate the difference). $\endgroup$ – Lucidity of Power Feb 21 at 9:08
  • $\begingroup$ There is a genuine problem here, IMO... you would expect the 'width' setting to yield a constant length in the newly-created transverse edges (the 'sleepers') .. but it doesn't. I've never noticed this before. I think it will have to be a workaround? $\endgroup$ – Robin Betts Feb 21 at 9:28
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How do you get to Killarney? Well, sir, I wouldn't start from here if I were you....

Just teasing.. I think some of this may have been be easier if executed before the array was applied. (Making an array out of arch-peak-to-arch-peak sections may still speed things up when adding detail?) This is a fix, rather than a solution, I'd like to know why the Bevel works the way it does.. whether the algorithm could be improved.

  1. Make a copy of your existing path-curves (you can CtrlJ join them into one curve object to save time later) call it, say 'Miter Path'
  2. Make a copy of your existing profile curve, and delete all but its flat base .. 'Molding Base'
  3. Use the Molding Base as a the Bevel Object for your Miter Path. You now have a set of ribbons
  4. With the ribbons anywhere you like in Z, select them, and then the Vault object. Put the (active) Vault into Edit Mode
  5. From an orthogonal view down Z, hit 'Knife Project' in the Tool region. This will cut a set of edges into the vault where you would have liked the bevels to be.
  6. There will be some extraneous vertices.. there are various ways of tidying them up .. I selected one of them , then used Select > Similar > Number of Connecting Edges to find the rest, and then X > Limited Dissolve to get rid of them.
  7. I also selected the penultimate vertices around the pole of the vault in order, hit J to make a ring of edges, and deleted the faces at the pole, assuming there will be some kind of boss or rosette there in the end.
  8. Now you can delete the faces between the knife-projected edges and CtrlE > Bridge Edge loops creating the flat bevel to accommodate the molding. CtrlR cut a loop down the middle of each bevel.
  9. ShiftD Duplicate the central loops of the bevel, P separate to a new object, and AltC convert to a curve - U resolution 1 - this will be your new path for the molding profile
  10. Move the origin of your molding profile to the center of its base - (this point will lie on the path). Use the molding profile as the Bevel Object for your new Molding Path. You may need to rotate it in Z in Edit Mode to get the molding to face the right way.

I apologize for the lack of step-by step illustrations - everything important is done by step 5.

enter image description here

Alterations on Layer 11.

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    $\begingroup$ I tested this out and it worked perfectly. I noticed that I had to bridge some areas and get rid of extra stuff as mentioned and got the perfect result. I also modified your method a little to try to simplify it for myself. It worked as expected. I never used knife project before, so this is something new for me that I just learned through your help. Thanks a lot! That really solved this issue! $\endgroup$ – Lucidity of Power Feb 22 at 23:19
  • $\begingroup$ @LucidityofPower Glad it worked .. and glad you found your own ways around it :) $\endgroup$ – Robin Betts Feb 22 at 23:37

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