initial upload

Unity-Master/Assets/Plugins/RootMotion/FinalIK/Constraints/ConstraintPositionOffset.cs

@@ -0,0 +1,64 @@
+using UnityEngine;
+using System.Collections;
+
+namespace RootMotion.FinalIK {
+
+	/// <summary>
+	/// Offsets the transform from its (animated) position.
+	/// </summary>
+	[System.Serializable]
+	public class ConstraintPositionOffset : Constraint {
+		
+		#region Main Interface
+		
+		/// <summary>
+		/// The position offset in world space.
+		/// </summary>
+		public Vector3 offset;
+		
+		public override void UpdateConstraint() {
+			if (weight <= 0) return;
+			if (!isValid) return;
+			
+			// Initiating
+			if (!initiated) {
+				// Storing default values
+				defaultLocalPosition = transform.localPosition;
+				lastLocalPosition = transform.localPosition;
+				
+				initiated = true;
+			}
+			
+			// Check if position has changed. If true, set default local position to current.
+			if (positionChanged) defaultLocalPosition = transform.localPosition;
+			
+			// Offsetting the position
+			transform.localPosition = defaultLocalPosition;
+			transform.position += offset * weight;
+			
+			// Store the current local position to check if it has changed in the next update.
+			lastLocalPosition = transform.localPosition;
+		}
+		
+		#endregion Main Interface
+		
+		public ConstraintPositionOffset() {}
+		
+		public ConstraintPositionOffset(Transform transform) {
+			this.transform = transform;
+		}
+		
+		private Vector3 defaultLocalPosition, lastLocalPosition;
+		private bool initiated;
+		
+		/*
+		 * Check if position has been changed by animation or any other external script. 
+		 * If not, consider the object to be static and offset only from the default rotation.
+		 * */
+		private bool positionChanged {
+			get {
+				return transform.localPosition != lastLocalPosition;
+			}
+		}
+	}
+}