Point on a curve in Translation AND rotation

[puppetsoul]

To do a facial rig, based on Skinned Curves, I try to put some joint or points on curves.
I want that this points follow the curves in translation, of course, but also in Rotation.

For this I create a motionPath. The problem with the MP is the cycle that you get. To avoird this I delete the addDoubleLinear, and plug directly the xCoordinate to the tx, and so on for y and z.

This seens working.

Inm just wondering, if there is a more elegant method. Somithing derivate from a pointOnCurve, but who get rotation from the tangeant, of something else, that I miss!

Any Idea?

Thank you. 

[joojaa]

Space curves do not really have rotation, they are not 3 dimensionsla but something like 2.8 diemesnional instead. What is they have a tangent and they have SORT OF a normal based on curvature. Unfortunately that means the normal is not entirely stable, it may flip if the curvature reverses on itself. You can attack this in 2 ways, you can subsection the curve at each flip point, or you can just make a striplike surface and make use of a curve on surface (which does have a stable normal).*

A motion path with a  flow path objects should do fine if you can manage to avid the flip (no biggie). You can then use the relationship editor to remvove the points you dont want affected.

that I miss!

howabout using strips of surfaces that you then use as warp deformers, or possibly wire deformers. Or wires driving strips drriving your points

The problem with the MP is the cycle that you get.

err explain, why would motion path get a cycle? THis si not motion paths normal behaviour its related to seomething esle you have going on in your model

*to be totally honest ist NOT a big deal to make a motionpath node that does NOT flip but ADisnt really interested in the effort

[puppetsoul]

I Joojaa...

With me motionPath ALWAYS print cycleCheck warning message on some condition, usually when you play with the follow options. This not appaears everytime, but often. You really never get this???
( // Warning: Cycle on 'locator5.transMinusRotatePivotX' may not evaluate as expected.   )
To avoid this, usualy I delete the addDoubleLinear, and I just be sure that I do not frezze tr for the locator (this is the utility of the addDoubleLinear)

Anyway, the goal of all of this was to create a facial rig system based on deformation. I wanted skin a lot of joints every 2 vertices (most of the time) and create relationShip via curves.
Anyway I found better... well I think, throught Im always in the testing stage : use muscle directly to "muscleSkin" the face, via the sticky method.
This seems work well for now, but I have to be deeper in the deformation I want to validate this.

I will have a result like the tutorial about diego (on this site), but with better result : I need a extra cartoonist deformation.

[joojaa]

With me motionPath ALWAYS print cycleCheck warning message on some condition,
usually when you play with the follow options. This not appaears everytime, but often.
You really never get this???

Only when i do it on purpose. Yes its because you drive the values 2 times over

Add double linear is a constraint, that has the purpose of allowing you to animate the channels independently, it does make a cycle. But if you use it right it does NOT cycle (it can not because your in its loop only when user input changes).

No you dont need it it can be handy tough