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rigging - path constrained. flipping axis.
show user profile  Wingman
i'm having a problem with flipping axis.
i have rigged a bike with a ground projection system like this one here:

and i have the projected plane path constrained to a spline, and the '% along path' is wired to a custom control-object. so i can animate the control-object and the bike follows the spline.
I have set the correct Axis (Y and Flip) in the Path constraint parameters, but when i re-load the max-file the bike is 90deg rotated. (as if it is set to x-axis, and not y as it should)
If i just touch anything in the parameters, like switch axis back and forth or change the percent, it jumps to correct position and stays there. This isn't the biggest problem, as i can just do this and then animate and render as normal.
But when i'm rendering through backburner, it flips 90 degrees in the render. I guess that is because backburner loads the file from scratch, so it looks like it does when i re-load it too.

I'm not sure what the root of the problem is, so i have tried many things. like changing controllers, starting the % along path on 1, changing the pc's regional setting decimal symbol, etc etc. but to no good.

Any ideas what i could try?

read 1753 times
6/8/2010 2:58:25 AM (last edit: 8/3/2010 8:54:24 PM)
show user profile  Wingman

read 1711 times
6/11/2010 4:11:54 PM (last edit: 6/11/2010 4:11:54 PM)
show user profile  Wingman
anyone? any thoughts on this?

read 1678 times
6/23/2010 10:51:50 AM (last edit: 6/23/2010 10:51:50 AM)
show user profile  Wingman
i still haven't found a solution to this one.
here's a jing. i have just loaded the scene, and the bike is rotated. i'm only selecting the path, and boom, it flips to correct position.

read 1644 times
7/15/2010 8:18:58 PM (last edit: 7/15/2010 8:18:58 PM)
show user profile  Wingman
really? no ideas? with all these big brains hanging around here :)

read 1586 times
8/2/2010 12:25:44 PM (last edit: 8/2/2010 12:25:44 PM)
show user profile  Dave
There appears to be a lot going on, I 'worry' that your custom control object is causing the issues, linking to something that links to something that links to something... y'know? If one of those 'links' has some screwy transformations it could be why Max is wanting to change the orientation.

That said... with path constraints there is some sort've "keep original offset" and "follow path" or something like that... maybe these are of use to you? It's hard to say... I'm sorry. I can see why people here are shying away from this!

"I flew over Egypt once"

read 1572 times
8/2/2010 10:37:00 PM (last edit: 8/2/2010 10:37:00 PM)
show user profile  Wingman
Thanks for snapping me out of my dreamworld Dave. I was so focused on finding the reason for this happening, yet it's almost impossible when i have so many objects and dummies linked and constrained.
So i deleted some links and tried a new aproach, and then i noticed something;
I was using a dummy with a path-constraint as the "position-root". so the ground projection was linked to that. i'm now using a normal geometry instead of a dummy, and it works great. i dont think i have changed anything else.

it has crossed my mind before that dummies are more difficult to work with when you depend on them with complex links and constraints. This time it was as if it needed a reminder of its axis constraint to the path when opening the file.
anyone else had any bad experiences when using dummies in rigging?

read 1555 times
8/3/2010 1:48:43 PM (last edit: 8/3/2010 9:15:59 PM)
show user profile  Dave
I can't remember for sure... so please don't quote me on this. But I think Dummy objects are often created with irregular rotation parameters. I can't go double check right now but if you make a few from different views (don't actually know if that's relevant), and look at the rotation value, they will probably be 90 or 180 degrees on one or more axis', or somewhere along those lines.

I tend to "freeze transforms" on objects I intend to wire up or apply constraints to. Or reset Xforms and collapse (can you do that with helper objects though?)

Anyway, glad it's all sorted.

"I flew over Egypt once"

read 1523 times
8/4/2010 1:23:32 AM (last edit: 8/4/2010 1:23:32 AM)
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