how to find an irregular shape's gravity point?!

here is my situation, I got an irregular curve, and I want to rotate it all the way up along the Z-direction, but not like a circle or an ellipse, you can easily find the center, this irregular shape doesn't rotate as I would have expected.

In order to make it clear, I attached a screen shot, please check it out.

thanks.

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Untitled-1.jpg, 302 KB

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Permalink Reply by Juan_P on May 27, 2010 at 10:06pm

Hey Jim,
Not sure is this is what you are looking for, but check out the images

Attachments:

your_example.jpg, 189 KB
my_example.jpg, 182 KB

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Permalink Reply by ronyDF on May 28, 2010 at 1:47am

hello Jim & Juan,

is this a solution for the pblm?

krgds, Rony

Attachments:

GravityPoint.ghx, 129 KB

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Permalink Reply by Jim choo on May 28, 2010 at 2:31am

that's exactly what I'm looking for, thanks Rony~

One more question, do you know how to, when twisting up, change the shape from the bottom to the top? let's say from a rectangle at the bottom to a circle at the top.......

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Permalink Reply by ronyDF on May 28, 2010 at 2:43am

the topic of transformations is different and depends on what you like to achieve. sorry, maybe someone else can give you some hints.

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Permalink Reply by to] on May 28, 2010 at 5:03am

you have to create a blendshape
shape on the bottom and shape on the top divide curves connect with bending curves due to your rotation and divide the lines again ....... the rest should be clear