So, I was trying to animate a single bone using FromToByAnimation, but when I start the animation, the model instead does the full body animation stored in the availableAnimations.
If I don't run testAnimation nothing happens.
If I run testAnimation I see the same animation as If I had called
entity.playAnimation(entity.availableAnimations[0],..)
here's the full code I use to animate a single bone:
func testAnimation() {
guard let jawAnim = jawAnimation(mouthOpen: 0.4) else {
print("Failed to create jawAnim")
return
}
guard let creature, let animResource = try? AnimationResource.generate(with: jawAnim) else { return }
let controller = creature.playAnimation(animResource, transitionDuration: 0.02, startsPaused: false)
print("controller: \(controller)")
}
func jawAnimation(mouthOpen: Float) -> FromToByAnimation<JointTransforms>? {
guard let basePose else { return nil }
guard let index = basePose.jointNames.firstIndex(of: jawBoneName) else {
print("Target joint \(self.jawBoneName) not found in default pose joint names")
return nil
}
let fromTransforms = basePose.jointTransforms
let baseJawTransform = fromTransforms[index]
let maxAngle: Float = 40
let angle: Float = maxAngle * mouthOpen * (.pi / 180)
let extraRot = simd_quatf(angle: angle, axis: simd_float3(x: 0, y: 0, z: 1))
var toTransforms = basePose.jointTransforms
toTransforms[index] = Transform(
scale: baseJawTransform.scale * 2,
rotation: baseJawTransform.rotation * extraRot,
translation: baseJawTransform.translation
)
let fromToBy = FromToByAnimation<JointTransforms>(
jointNames: basePose.jointNames,
name: "jaw-anim",
from: fromTransforms,
to: toTransforms,
duration: 0.1,
bindTarget: .jointTransforms,
repeatMode: .none,
)
return fromToBy
}
PS: I can confirm that I can set this bone to a specific position if I use
guard let index = newPose.jointNames.firstIndex(of: boneName) ...
let baseTransform = basePose.jointTransforms[index]
newPose.jointTransforms[index] = Transform(
scale: baseTransform.scale,
rotation: baseTransform.rotation * extraRot,
translation: baseTransform.translation
)
skeletalComponent.poses.default = newPose
creatureMeshEntity.components.set(skeletalComponent)
This works for manually setting the bone position, so the jawBoneName and the joint-transformation can't be that wrong.
