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Assets/Plugins/RootMotion/FinalIK/Tools/OffsetModifierVRIK.cs

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+using UnityEngine;
+using System.Collections;
+
+namespace RootMotion.FinalIK {
+
+	/// <summary>
+	/// Base class for all FBBIK effector positionOffset modifiers. Works with animatePhysics, safe delegates, offset limits.
+	/// </summary>
+	public abstract class OffsetModifierVRIK: MonoBehaviour {
+
+		[Tooltip("The master weight")]
+		public float weight = 1f;
+
+		[Tooltip("Reference to the VRIK component")]
+		public VRIK ik;
+
+		// not using Time.deltaTime or Time.fixedDeltaTime here, because we don't know if animatePhysics is true or not on the character, so we have to keep track of time ourselves.
+		protected float deltaTime { get { return Time.time - lastTime; }}
+		protected abstract void OnModifyOffset();
+
+		private float lastTime;
+
+		protected virtual void Start() {
+			StartCoroutine(Initiate());
+		}
+		
+		private IEnumerator Initiate() {
+			while (ik == null) yield return null;
+
+			// You can use just LateUpdate, but note that it doesn't work when you have animatePhysics turned on for the character.
+			ik.solver.OnPreUpdate += ModifyOffset;
+			lastTime = Time.time;
+		}
+
+		// The main function that checks for all conditions and calls OnModifyOffset if they are met
+		private void ModifyOffset() {
+			if (!enabled) return;
+			if (weight <= 0f) return;
+			if (deltaTime <= 0f) return;
+			if (ik == null) return;
+			weight = Mathf.Clamp(weight, 0f, 1f);
+
+			OnModifyOffset();
+
+			lastTime = Time.time;
+		}
+
+		// Remove the delegate when destroyed
+		protected virtual void OnDestroy() {
+			if (ik != null) ik.solver.OnPreUpdate -= ModifyOffset;
+		}
+	}
+
+}