Shape -> Network

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 From:  Hbasm
1905.1 
Hi,

I've been trying out MoI again, and there are some things I don't understand: Why won't these curves resolve to a mesh when I push "network"? Sometimes I can get it to work, but often nothing happens or the shape comes out extremely distorted. I don't see why. It's a shame cause I really like MoI's easy curve editing features.

Question #2: Assuming I can overcome this problem (and I'm beginning to doubt it) ... is this a good time to buy MoI or should I wait a few more weeks/months until version 2 is officially out?

Thanks for your time.


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 From:  Michael Gibson
1905.2 In reply to 1905.1 
Hi Hbasm, the problem is with your 2 curves that cross each other and then come back to touch the same base curve - that prevents MoI from properly unwrapping your curves into a flat 2D grid.

Basically, for network to work your curves must be arranged like latitude or longitude lines on a globe.

In your example you have one closed curve - that will make that curve behave like the equator line in a globe.

Now once you have an equator, you cannot have lines of longitude that start at the equator then go up over the north pole and then come back down and touch the equator again - longitude lines should end at the pole and not continue up past the pole and wrap back down the other side of the "globe".

It's a bit difficult to explain but please refer to this previous post that has some illustrations which will help to explain it better:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1778.6


The basic solution is to cut your 2 open curves with each other so that they can be unwrapped to a 2D grid.

Actually your curves are already made up of segments that should work for this, so instead of cutting them you can use Edit/Separate on them. To make your curves work, you will need to select the 2 open curves, then run Edit/Separate, then re-join the pieces together to form 4 curves in this kind of an arrangement (shown separated slightly here for illustration):



With your curves arranged in this manner, MoI will be able to figure out how to unwrap them into a 2D grid layout and then can construct the Network:



- Michael

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 From:  Michael Gibson
1905.3 In reply to 1905.1 
Hi Hbasm, sorry missed your second question:

> Question #2: Assuming I can overcome this problem (and
> I'm beginning to doubt it) ... is this a good time to buy MoI
> or should I wait a few more weeks/months until version 2
> is officially out?

This is a good time to buy - version 2 is not very close yet, it probably won't be finished until sometime in the beginning of next year like 6 months or so from now.

There is a v2 beta version currently available for v1 users to test out and give feedback on, but it is still pretty early on in the v2 process. There will be a lot more stuff added before v2 is complete.

- Michael
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 From:  Hbasm
1905.4 
Thank you Michael ! That works, and I think I understand the concept better now.

I wasn't expecting that "pinching" at the pole though... If you know what I mean? Although technically the mesh does follow the curves I've made, I'm trying to get a smooth "natural" flow ... through the pole... Can it be done? :-)

Kind Regards,
Hbasm
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 From:  Michael Gibson
1905.5 In reply to 1905.4 
Hi Hbasm - it looks like you really want a kind of disc type shape from this.

I think you may be better off using the Rail revolve command which allows you to kind of pivot one profile around an axis while at the same time stretching it out to meet a rail curve.

So to do that you would have curves arranged like this (see file attachment RailRevolveCurves.3dm for model file):



Then to produce the revolve, select the vertical profile curve, and then run Construct / Revolve / Rail Revolve.

Next select the lateral path curve as the rail.

Then the next thing will prompt you for the rotation axis, you want to pick points at the top here:



and bottom here:



That will then create a surface by pivoting that proflie curve around that axis and also stretching it out to meet your path, to make this result:



Here's a look at the underside:




That is a probably a better tool to use for making a kind of regular disc type shape, it will have a very regular shape throughout.

- Michael

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 From:  Hbasm
1905.6 
That's exactly the shape I was going for. Thank you very much! ;-)
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