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Motion path/flow

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Frank Rieder
Motion path/flow
on Oct 23, 2009 at 12:52:33 pm

I have created a motion path and a polygon is flowing on it.
The ploygon flows around a cylinder (CCW)and at about 9'o'clock it
mirrors/rotates it. I think it has something to do with the
"up" setting of the motion path (tried all posibilities), but cannot figure it out.
Any ideas?
Thanks in advance.
Frank


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Michiel Duvekot
Re: Motion path/flow
on Oct 23, 2009 at 2:28:35 pm

I often find that setting the world Up Object to the object on the motion path itself works well enough.


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Frank Rieder
Re: Motion path/flow
on Oct 26, 2009 at 9:02:58 pm

Michiel,
Thanks so much again.
It didn't work. I tried a new polycube instead of my mulit piece
and it does the same thing.
Let me try to explain it differently.
If my polygon would be a airplane, imagine it to fly a looping with the landing gear facing towards the center of the loop. When I have the world up to vector it flips the plane at about 9'o'clock, meaning the landing gear is now pointing away form the center of the loop. I think I tried everything....all world up setting do it sometimes in different positions.
Thanks


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Michiel Duvekot
Re: Motion path/flow
on Oct 27, 2009 at 4:22:39 am

The world up Type must be set to Object Up, but you also need to set the World Up Object by entering the name of the object in the text field. Did you did that? In some cases, you have to animate the World Up Object to fix the flipping.


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Frank Rieder
Re: Motion path/flow
on Oct 27, 2009 at 12:58:22 pm

Michiel,
Thanks for the input, but that also didn't fix it.
When you say animate the object, what do you mean?
It is obviously animated, it is attached to the motion path
and flows on it. I tried object up and entered its name and
it flipped it right after the start and a couple more times.
I red another thread about animating text and it looks like this
is a weak spot of maya. If anybody knows how to fix this, please let me know.
Thanks


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Michiel Duvekot
Re: Motion path/flow
on Oct 27, 2009 at 9:59:35 pm

When I say animate the object, I mean the object whose name you entered. It is a good idea to create a locator for this kind of setup. It's not always easy, but I have been able to fix all cases of flipping I have seen so far.


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Frank Rieder
Re: Motion path/flow
on Oct 28, 2009 at 12:07:54 pm

Michiel,
My words may have come across wrong. I appreciate you help very much.
I am a novice in Maya. I am trying to make a animation of a printing
press, very technical. I am trying to animate a flexible metal plate,
being mounted on one of the cylinders. Using a bender doesn't work well
because it rolls that plate up in a straight line, the flow option on the motion path looks much more authentic. What exactly do you mean with a locator?

Thanks
Frank


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Michiel Duvekot
Re: Motion path/flow
on Oct 29, 2009 at 2:09:30 pm

A locator is an object that does not show up in you rendered images. It makes for a good control object. You create one with Create->Locator. I've done plenty of the type of thing you're working on, paper folding machines, printers, etc. I've always used combinations of bend deformers and motion paths, and in some cases lattice deformers to move sheets through the machines. It may not be the easiest thing do do, but it's quite possible. Feel free to send me a file if you have something I could look at. You can reach me at michiel@thnkr.com.


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