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View from inside a Torus

 
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srgfraser
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Joined: 25 Aug 2012
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PostPosted: Sat Aug 25, 2012 8:02 pm    Post subject: View from inside a Torus Reply with quote

Is there a way to render the view from inside a torus ring? In other words, turn on the inner surface of the ring.
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Spaddlewit
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PostPosted: Sat Aug 25, 2012 9:42 pm    Post subject: Reply with quote

Create a torus, duplicate it, then go into polygon mode, select all polygons, then use the Flip tool. Lastly, you can merge the two objects if desired.
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AWM Mars
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PostPosted: Sun Aug 26, 2012 12:00 am    Post subject: Reply with quote

Just to clarify a touch, select only one of the torus's, and flip its polygons. You can select just one copy in the scene tree. Smile
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Jeroen
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PostPosted: Sun Aug 26, 2012 8:05 am    Post subject: Reply with quote

That would certainly work. Smile

You might also want to slightly scale the duplicated torus so that it's a bit smaller than the original. This gives the final object a 'thickness', so to speak.

P.s. hold CTRL to perform a uniform scale of an object in all 2d/3d views.
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AWM Mars
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PostPosted: Sun Aug 26, 2012 9:09 am    Post subject: Reply with quote

hmm, sadly that will not scale the inner diameter, as scaling works on a bounding box. Could simply create a tourus with the slightly smaller dimensions, flip its polys and them position it on the same coordinates.
I did this same exercise with this project http://www.awm.mars.yourinside.com/gallery.html
Took me a while to get my head around the mechanics of how to produce a twin skinned hull using a torus. Very Happy


Here is the issue in detail:


Solution:
As the settings for creating a Torus won't allow for decimal places, you have to create two very large Torus's using say Outer Radius of 200, Inner Radius 20, and another with Outer Radius of 199 and Inner Radius of 19. Select the Inner Torus and flip its polygons. Adjust the scale of both Torus's using absolute dimensions, making the inner torus slightly smaller. The two profiles should now fit symetrically together.

I created a pair of matching Torus's for you, in DPS format (DeleD Package Plugin). All you need do is alter the sizes to suit your project.
http://www.working.yourinside.com/DeleD/TorusInnerAndOuter/TorusInnerAndOuter.dps
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Last edited by AWM Mars on Sun Aug 26, 2012 11:55 pm; edited 1 time in total
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Jeroen
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PostPosted: Sun Aug 26, 2012 1:41 pm    Post subject: Reply with quote

Hey, that hull looks cool! Very Happy
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trucker2000
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PostPosted: Sun Aug 26, 2012 2:34 pm    Post subject: Reply with quote

Scaling a tourus is difficult at best. I found that if you don't need to see the outside, just flip the faces and forget about it. If you must see the outside as well, AWM's suggestion is the best.
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AWM Mars
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PostPosted: Sun Aug 26, 2012 4:25 pm    Post subject: Reply with quote

Yes, on the hull I produced, it had portals (space windows), where you could see most faces of the outer torus. Fortunatley, as I faced this similar issue a while ago, I was able to assist with a solution.
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srgfraser
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PostPosted: Sun Aug 26, 2012 5:37 pm    Post subject: Reply with quote

Thanks all for the great input...

I'll try to absorb it and see what I come up with!

Thanks again.
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fik
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PostPosted: Sun Aug 26, 2012 9:09 pm    Post subject: Reply with quote

AWM Mars way works good. There is an easier way though.
If You use the inflate plugin I did ( can find in this thread http://www.delgine.com/forum/viewtopic.php?t=3445 use trucker2000's mirror as free site has dropped. Thanks trucker for this foresight Very Happy )
Create your outside torus then clone, use inflate with negative value, then flip polygons in selected object and join objects if needed.
No need to have to try to align the toruses then.
Hope this helps.
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AWM Mars
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PostPosted: Sun Aug 26, 2012 9:15 pm    Post subject: Reply with quote

Hmm, some great plugins.. Inflate I didn't know about.. glad you livened the link, sure would have saved me a lot of work, when I did my Torus hull Very Happy
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