Fitting attachments to the skeleton joints - how to do it?

[Noel Loordes]

Hello!

Is there any reasonably easy way to position prims on an avatar such that, when the joints are bent, two specific points in the attachments on bones next to each other will not be shifted off each other? That is, I want to center elements of the neighboring attachments to the joint of the avatar skeleton.

In particular I'm trying to make prim based pants (for my own use, so fitting to different shapes is no concern), but so far I can't see how to make the knees look properly during avatar movement or when sitting.

It's not limited to pants though. When working on my mechanical avatar, its a big issue all the same.

Using Phoenix-Viewer's "Show Collision Skeleton" gives a little help, but has now turned out too little precise.

[Void Singer]

unfortunately, no, unless you can specify the bone lengths... meaning they would have to use a specific shape. this is the exact reason that animations look odd of some av's and fine on others.... fiddling around with the positions for your av you can eventually get near perfect alignment, but it'll only apply to the settings of your particular shape.

[Noel Loordes]

Well, it's meant mostly for my own use and I'm using only one shape, so... How would it work then? Manually adjusting with a posing stand is quite a pain; Whenever I think, I finally got two adjacent objects aligned to the joint, in some other pose they are off again.Their distance didn't even seem to be converging. Especially when I have later to readjust the angle of an object to fit multiple joints (e.g. ankle and knee) that "trying until it fits" approach is pretty annoying.

[Void Singer]

agreed, and unfortunately, it's about the best we have.... however, there may be some small halep in there...

IIRC the attach points are all at the center of the bone or at the joint. that means that either you are automatically where you need to be, or that resizing a zero-alighned & zero_centered attachment point primwill give you both joint centers when you find one.

using an alignment texture on two rod prims with a full alpha avatar should show you a precise center position for the joint between them as well