CGTalk - Dangling Cables on Robot Arm

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mustardseed

10-16-2007, 03:28 AM

Hi,

I'm a far cry from being even a beginner with Xpresso, but I've gleaned this technique from a tut on base80.com, and following a reply by Srek on the site to use a "3rd weighted point" to control a 3-point spline, I sorted whacked this together. But, I'm facing a problem where rotations of the set-up create a strange stretch on one cable, but not the other.

Anyone have the time/interest to figure out what I've done wrong? BTW, the noise nodes are in there to create a fake 'jiggle' to cheat the cable dynamics during animation.

Thanks in advance!

mustardseed

10-17-2007, 05:26 AM

Bump. Any ideas so far, anyone?

Lex1968

10-17-2007, 05:46 AM

Hi Andrew,

I took a quick look at it. It looks like your problem only appears in the viewport. Normally that means a priority issue. If you animate your arm -and render the animation- you'll notice that the cables react more or less as they should. Only the first frame the cables have to stabalize. You can 'fix' this by starting your animation at frame -1.

I haven't looked at your XPresso setup in depth. But another approach is based on a tutorial from 3DKiwi at C4Dcafe about cables: http://www.c4dcafe.com/ipb/index.php?automodule=downloads&showfile=125 Which helped me with the same problem.

Cheers, Lex

mustardseed

10-17-2007, 06:09 AM

Thanks very much, Lex! I'll try as you suggest, and definitely look at the C4d Cafe tut. Thanks for the link!

andrew

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