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Kevin Iglesias/Human Animations/Scripts/SpineProxy.cs

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+// -- SPINE PROXY 1.0 | Kevin Iglesias --
+// This script ensures correct animation display when mixing upper and lower body animations using Unity Avatar Masks.
+// Attach this script to the 'B-spineProxy' transform, which is a sibling of the 'B-hips' bone.
+// In the 'originalSpine' field, assign the 'B-spine' bone (child of 'B-hips' and parent of 'B-chest').
+// By default it will automatically find the 'B-spine' and assign it to the 'originalSpine' field (OnValidate).
+// When using a different character rig, manually assign the corresponding spine bone to the 'originalSpine' field and recreate
+// 'Rig > B-root > B-spine' structure in your character hierarchy with empty GameObjects.
+
+// More information: https://www.keviniglesias.com/spine-proxy.html
+// Contact Support: support@keviniglesias.com
+
+using UnityEngine;
+
+namespace KevinIglesias
+{
+    public class SpineProxy : MonoBehaviour
+    {
+        //Assign 'B-spine' (or equivalent) here:
+        [SerializeField] private Transform originalSpine;
+
+        private Quaternion rotationOffset = Quaternion.identity;
+
+#if UNITY_EDITOR
+        //Attempting to find the original spine bone.
+        void OnValidate()
+        {
+            if(originalSpine == null)
+            {
+                Transform parent = transform.parent;
+                if(parent != null)
+                {
+                    Transform hips = parent.Find("B-hips");
+                    if(hips != null)
+                    {
+                        Transform spine = hips.Find("B-spine");
+                        if(spine != null)
+                        {
+                            originalSpine = spine;
+                        }
+                    }
+                }
+            }
+        }  
+#endif
+        
+        //Match correct orientation on different character rigs
+        void Awake()
+        {
+            if(originalSpine != null)
+            {//originalSpine.rotation must be the default rotation in your character T-pose when this happens:
+                rotationOffset = Quaternion.Inverse(transform.rotation) * originalSpine.rotation;
+            }
+        }
+
+        //Copy rotations from spine proxy bone to the original spine bone.
+        void LateUpdate()
+        {
+            if(originalSpine == null)
+            {
+                return;
+            }
+            originalSpine.rotation = transform.rotation * rotationOffset;
+        }
+    }
+}

Kevin Iglesias/Human Animations/Scripts/SpineProxy.cs.meta

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Kevin Iglesias/Human Animations/Scripts/UpperBodyAnimations-SpineProxy.url

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+[InternetShortcut]
+URL=https://www.keviniglesias.com/spine-proxy.html

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