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Charles Flèche
  19 days ago
As far I know you can't list list-edit an attributes, so generating the full set of bones can't be done with USD composition itself.
Maybe that could be done with additionnal logic ?
Variants per bone set contains contains a prim that has an attribute: a list of bones
When a variant is activated it also add the relationship a custom rel attribute to your Skeleton
on recomposition the attribute that contains the rel to Prim that contain bones is notified to have changed
a script rebuilds the full skeleton
(edited)
:+1:
1


Charles Flèche
  19 days ago
I am not super clear...


Charles Flèche
  19 days ago
Let me see if I can make a quick example


Charles Flèche
  19 days ago
#usda 1.0
def SkelRoot "SkelRoot" (
  variants = {
    string tool = "hammer"
    string shoe = "trainer"
  }
  prepend variantSets = ["tool", "shoe"]
)
{
  def Skeleton "Skeleton"
  {
    uniform token[] joints = []
    custom token[] main_joints = ["root", "root/hand", "root/foot"]
    custom rel addons
  }
  
  variantSet "tool" = {
    "hammer" {
      over "Skeleton" {
        append rel addons = </SkelRoot/Skeleton/Hammer>
        
        def "Hammer" {
          custom token[] addon_joints = ["root/hand/hammerbase"]
        }
      }
    }
    "compass" {
      over "Skeleton" {
        append custom rel addons = </SkelRoot/Skeleton/Compass>
        
        def "Compass" {
          custom token[] addon_joints = ["root/hand/hinge", "root/hand/hinge/left", "root/hand/hinge/right"]
        }
      }
    }
  }
  
  variantSet "shoe" = {
    "trainer" {
      over "Skeleton" {
        append rel addons = </SkelRoot/Skeleton/Trainer>
        
        def "Trainer" {
          custom token[] addon_joints = ["root/foot/trainer"]
        }
      }
    }
    "robotBoot" {
      over "Skeleton" {
        append custom rel addons = </SkelRoot/Skeleton/RobotBoot>
        
        def "RobotBoot" {
          custom token[] addon_joints = ["root/foot/boot", "root/foot/boot/hinge", "root/foot/boot/hinge/tip"]
        }
      }
    }
  }
}


Charles Flèche
  19 days ago
image.png
 
image.png


Charles Flèche
  19 days ago
Don't know if it is clearer, but at list if you open the file above in usdview you should be able to switch variants and see /SkelRoot/Skeleton.addons to be update with the list of addons prim. Those prim contains a list of addon_joints , so with a notification handler you should be able to recompose /SkelRoot/Skeleton.joins  on top of the base skeleton bones defined in /SkelRoot/Skeleton.main_joinrs


Charles Flèche
  19 days ago
IIRC there was a discussion on the previous Google List on allowing list-editing uniform (non time sampled) Attributes. That definitely could be useful for this kind of workflow, as Skeleton.joints is uniform, so we could leverage's USD list-editing operations directly.


Koen Vroeijenstijn
  18 days ago
When I tried to represent attachments elegantly, I ran into the issue that there is no parenting to bones. As all the joints are represented as a single prim, you cannot parent the attachment to a specific joint ( connect the neck joint of the body to the neck joint of the body for example to swap out heads). For static models, I just apply the transform of the "attach to" joint  to the attachment, if you then convert to native geometry, you can easily create a parent contraint, but it's not ideal. I played around with merging the skeletons, but then updating all the skin weights for the meshes gets messy. Maybe we can have a very simple "parent joint constraint" or perhaps a more expensive representation of a usdskel which does unroll into the regular scene graph. Hope I remember right, it was a while ago I looked at this. Curious if Charles' suggestion works for you, please keep us posted. (edited) 
:+1:
1


Alan Kent
  15 days ago
A standard way to do parenting to bones, or a "UsdSkel as prims" would be nice. E.g. how to put an arbitrary hat on a head?

Typical problem is : when you have extra joints in the jacket, how do you simulate these joints.

USD does not allow to do extra operation on the Skeletal.

Koen Vroeijenstijn haven't found yet a good way. A simple constraint would be good for games.

TJ worked on a schema for that but wasn't able to finish his work.

For Frieder, constraint is one solution. In MoBu and Maya become heavy resources
Another solution is to have one skeleton. 
A very good solution would have the ability to reference another skeleton to evaluate one hierarchy.

For animation is very important to have all in one system.

Setting up something work to create asset for animation. TJ will check for that.

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