View Full Version : Help with Modelling a Groin/Cross Vault

02 February 2007, 10:54 PM
Hello to all.

I have been having trouble with modelling a groin vault also known as a cross vault.
I searched high and low on the net and in forums for tutorials but none can be found.

Picture of Vaults (3 good ones at bottom)

I'm using XSI but if someone can explain it in there program I 'll try to figure it out.

The closest I came was using bolean operations of two arched segments or hallways...but that led to problems I could not fix.

I'm sure someone on these forums can do it ...i've seen these types of vaults modelled in CG environments before...even in video it can't be that hard once you know the proper way to approach it.

Thanks a lot for any help or links to tutorials.

02 February 2007, 07:03 PM
It's actually pretty easy once you know how to do it.
First get yourself the upper half of a tube like this:

then activate the knive tool and make 2 cuts at a 45 degree angle like this:

Then delete the left polygons and duplicate the object three times around the leftmost
point. You should have something like this:

Now merge the 4 Objects, bevel a few times, scale it a little bit on the Y Axis and you get yourself a nice Groin vault :)


02 February 2007, 10:47 PM
Have you tried curves/lofts?

03 March 2007, 12:25 AM
Thats great psycrow. Very simple once you know how...but it does look a little bit "bulky" i bet moving some verts around before the duplication, bevel op's would prolly fix that if your going for a different groin vault look..

Would you happen to know a quick way to do one of these vaults.

THanks for the help.

03 March 2007, 12:26 AM
I'm not sure how you would go about making that shape with curves and might be possible.

03 March 2007, 12:35 AM

How did you get your shape in the first picture...The upper half of the tube.

03 March 2007, 01:05 AM
Psycrow, would you be able to list what bevel options you used to get that shape...i've been trying to bevel this thing and i'm getting this...

03 March 2007, 02:06 AM
That looks like you are bevelling the whole object. You need to select only edge loops along the intersections of the pipes and around each opening and bevel only those. You might want 2-3 bevel subdivisions. The edge loop select tool (alt + middle mouse button, while in edge mode) will be useful for selectong your desired edges.

03 March 2007, 02:28 AM
Ah thanks very much, ill try it out.

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