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Help a brother understand
show user profile  digital3ds
There comes some times when I know how to use something, but I don't understand it... I've checked f1 files but I still can't put it into my own words

Orientation constraint -- First Q, what exactly is the "orientation". How is orientation determined? How does the constraint work?

This is the problem I encounter often: I am working on a rig. If I duplicate a bone (let's say the forearm bone), then mirror both as a copy (not using the "mirror" button in bone tools, but in the top shelf) to the opposite side of the body, then try to orientation constrain one forearm bn to the other (after freezing transforms on both), the bone I run the constraint on pops ever so slightly out of place... What causes that little pop? -- The constraint works without popping on the original side of the body.
- Mike Sawicki




read 576 times
7/12/2012 7:20:43 PM (last edit: 7/21/2012 12:34:24 AM)
show user profile  herfst1
Think of orientation constraint as rotation constraint (though it might technically have a small difference that I'm unaware of).

Regarding mirroring bones, in the CGAcademy videos I followed (which can be found on youtube for free but are a bitch to find in correct order) the tutor said to only mirror bones using character menu option (but when possible, avoid mirroring). So I ignored him and mirrored them normally as I didn't want to set up all of the equations again; and found that with a few tweaks to upnodes and pluses and minuses and shit you will get it to work, you just have to be dilligent. As for the popping, dunno, mirroring can cause random errors.

Your best option is to mirror bones BEFORE you chuck on any constraints, then you shouldn't have a problem.
read 554 times
7/12/2012 8:26:34 PM (last edit: 7/12/2012 8:26:34 PM)
show user profile  digital3ds
Ima try it now... seems crazy they would b different - and would b so much easier to just set the pivot to the origin and mirror the bones exact neg position, instead of trying to rough it in with an offset
- Mike Sawicki




read 542 times
7/12/2012 9:12:07 PM (last edit: 7/12/2012 9:12:07 PM)
show user profile  ScotlandDave
Are you applying the orientation constraint as a relative or absolute relationship? IE if it`s absolute, due to possible slight differences even in a mirrored setup it might be inducing a pop - although not 100% that`s what the problem is.

As i`ve not used max for rigging in a long while ( c4d mostly for everything now ) i can`t remember if there`s an option for relative or absolute transform when you apply the constraint ( in c4d there is ).

Not turning into a Maxon advert here but one of the cool things about c4d when rigging etc is that you can change the priority of when things are executed ie you can mix constraints, ik, bones, custom xpresso setups, and have them run through in a specific order of priority.. which is cool :)



Website | Blog | Contact | Vimeo

read 534 times
7/12/2012 9:26:21 PM (last edit: 7/12/2012 9:26:21 PM)
show user profile  digital3ds
Hm, not sure of the difference - would absolute orientation constraint mean the rotation couldn't go neg? I just used the regular orientation constraint. Somehow I resolved that pop, but as usual, one solution leads to a new problem.

I'm setting up arm rigs that will blend between IK and FK controls. Now I'm having a problem with the (orientation?) of my controls and bones.

For some reason my transforms are not going together - I tried to align them with alt a, but nothing works

Im not sure why or how to fix it, but going from left to right ( wrist - forearm - elbow - bicep ) the first three's transform gizmo is pointing to the left, where the shoulders transform gizmo points to the right. ??

... The order of 'work' I do for something like this is: mirror - freeze transforms - align - constrain.... I swear to god I do this the same way everytime, but get different results.
- Mike Sawicki




read 503 times
7/13/2012 4:58:27 AM (last edit: 7/13/2012 5:32:32 AM)
show user profile  herfst1
Um, it's best you follow through a tutorial. This is one of the clearest ones I've found.


read 480 times
7/13/2012 8:33:15 AM (last edit: 7/13/2012 8:33:15 AM)
show user profile  digital3ds
Cool, thanks for the vid herfst1


*** and of course, as soon as I post a new question, max mysteriously fixes itself
- Mike Sawicki




read 428 times
7/21/2012 12:36:48 AM (last edit: 7/21/2012 12:46:23 AM)
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