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Old 31st August 2009, 08:58 AM   #1
SnapBean
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Default Extruding a Surface

I'm trying to extrude a surface on a cylnder. I go to surface mode, highlight the surface and select extrude by normal distance. It works, except it moves the entire surface in the direction of the extursion.


Any help..thanks.
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Old 31st August 2009, 12:16 PM   #2
Dennis
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Default Re: Extruding a Surface

Are you saying it's moving the surface without extruding? It should be extruding the surface and moving it in the surface normal direction.

If it is extruding, what is it doing / not doing that you're expecting?
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Old 31st August 2009, 12:38 PM   #3
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Default Re: Extruding a Surface

I didn't realize it moves the position of the origional surface after its extruded.
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Old 31st August 2009, 03:30 PM   #4
donamy
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Default Re: Extruding a Surface

What did you expect ? Maybe extrude is not what you want to do.
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Old 31st August 2009, 04:05 PM   #5
SnapBean
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Default Re: Extruding a Surface

I thought it would extend the surface without moving it. Kinda like "grow" the surface in the normal direction.

Ok, here's what I'm trying to do. I'm modeling a gun barrel. It was created using a cylinder. The surfaces on the front of the cylinder have been removed so it looks hollow. Now, I want to thicken the barrel internaly (i.e. reduce the barrel thickness). So I select a surface and extrue by distace in the normal direction...which gives good results, except when I look at the outside of the barrel and the surfaced has moved.

humm.. maybe I need something else to do this
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Old 31st August 2009, 08:39 PM   #6
donamy
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Default Re: Extruding a Surface

Try , while in vertex mode, select all vertices at one end of the cylinder, select extrude edges, scale inward by dragging a corner to the smaller diameter you want. Then extrude edges again, drag the vertices toward the opposite end. you now have the start of a smaller barrel.

Last edited by donamy; 1st September 2009 at 01:46 AM.
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Old 1st September 2009, 01:30 AM   #7
luuckyy
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Default Re: Extruding a Surface

Quote:
Originally Posted by SnapBean View Post
So I select a surface and extrue by distace in the normal direction...which gives good results, except when I look at the outside of the barrel and the surfaced has moved.

humm.. maybe I need something else to do this
Look at your extrude parameters.
In your case I would check "cap end" and "flip new surfaces" and I would uncheck "remove original".

But what donamy said would probably be faster (replace "extrude surfaces" by "extrude edges").
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Old 1st September 2009, 01:45 AM   #8
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Default Re: Extruding a Surface

Yes, my mistake.

corrected !
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Old 7th September 2009, 12:33 AM   #9
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Default Re: Extruding a Surface

With the new extrude by normal function, I've found that you must make the object have ONE-SIDED surfaces first and make sure the surfaces are facing towards where you want to extrude. Otherwise, it will extrude in both directions and you don't want that...

So, for a gun barrel, I'd create the cylinder, make the cylinder 1-sided and flip the normals facing inward. Then select all the surfaces and do the extrude-by-normal.
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