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skins with characters of different sizes

utkiupe

Hi there
I am trying to create a rig with characters of different body size with the use of skinned constrains
example :

(characters are gray because I tint the different parts directly in Spine, to have a smaller sprite sheet)

And I want to do it without creating complex setups. For example I am trying to avoid deforming meshes.

however, I have a few concerns, regarding complexity and production time

1 / Since the constrain is just used/ not used by a skin, if I want more body type, I need to create specific constrains and bones for them (i.e. duplicate them all for the new character, then set them up correctly...). I thought that by duplicating my skin it would create new constrains, but nope... I was thinking maybe, skinning the constrain parameters, (such as the offset) would make it really helpful, what do you think about that?
2/ Another issue I am having is bone length. I don't know how to adapt bones length automatically
so, this is how it looks if I setup my bones with the bigger character, and then select the skin of the smaller character

I have tried to create other constrains to replace the elbow

but since the upper arm bone is too long, this obviously doesn't work as I expected

Any idea on how to fix this ?

3/ the other workaround, (and I discussed it already here : http://fr.esotericsoftware.com/forum/point-attachment-and-child-bones-9883 is to create a setup animation, with one frame, that would correctly place all the bones how I want them. However it is not possible to change a bone length.
I wish it could be done directly with skinning, since this is what skinning is for 🙂

thanks

Erika

Hello,

There are several possibilities to go around this:

Here's a skin constraints tutorial:
Blog: Skin constraints for different proportions

When I had to do a similar process for a character that was taller than the original, I ended up making a transform constraint for each part.
My settings looked like this to relocate a bone to match a new position:

Note that I had both Relative and Local checked to make this work nicely and avoid problems when flipping the skeleton.
Transform Constraints - Spine User Guide: Options

The nice thing is that you set it once, then forget about it.

utkiupe

thanks
so for the arm with the IK, I figured out that by removing the length of the bone for the upper arm, the problem is gone 🙂

Also, there is a bias on my issue : I really want to make this process quick, since it's a small game.
I am not sure I can come up with an easy and quick solution though.
My first thought was to avoid using mesh, because I don't want to spend time to set them up for each skin.
But maybe I am totally wrong on that...

Also, I realize I was trying to use extra bones for placement, which is absolutely not mandatory since you can use only offset for placement.
I am going to go this way, but as I mentioned in another post, since we can not duplicate these constrains, it will take some time to achieve. I think I am going to limit the number of different character proportions and have a few patterns only...