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Quick question on PhysicsHingeChain hierarchy

Jamez0r

Hi Harald :grinteeth:

I'm working on an enemy character who is a giant, and has 550 bones in its skeleton. I have 'tendril' pieces that are hanging off of various parts of its body that I set up as 2D physics chains. I was just doing some Profiling of the game, and noticed that the SkeletonUtility bones updating was taking a LOT of CPU. I went in and deleted all of the SkeletonUtility bones that weren't within the hierarchy of Skeleton Root Bone -> Physics Chain bones. So I was able to reduce it down to ₆₀ SkeletonUtility bones (not including the actual physics chain bones) which is much better.

This enemy character has two heads that are on really long necks. The necks are ₂₅ bones in a chain, and there are physics chain 'tendrils' hanging down from the heads.

I was wondering if it is necessary to have the SkeletonUtility hierarchy from Root Bone -> Chain bone? Could I instead just have a BoneFollower component on a gameobject that follows the bone that is the immediate parent of the physics-chain, or something like that?

Thanks for any info! :nerd:

Harald

Yes, your observations are correct, you can omit having the whole hierarchy as SkeletonUtilityBone and instead use a BoneFollower at the right place.

A SkeletonUtilityBone component is using local rotations in both modes Override and Follow. If you look at the SkeletonUtility Platformer HingeChain Physics example scene, you can see that the cape-root has the Parent Reference parameter at SkeletonUtilityBone and the Connected Body at the Joint Component both set to the mantles Follower GameObject (mantles is the parent bone of cape-root). Now the mantles Follower GameObject has to be at the right location so that local rotations relative to it behave as expected. This location can be achieved by using a BoneFollower or any custom component that places the GameObject at the location of the parent mantles bone.

Jamez0r

Thanks Harald!!

Harald

You're very welcome! 🙂