first commit

Library/PackageCache/com.unity.timeline@1.7.6/Samples~/Customization/Utilities/QuaternionUtils.cs

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+using UnityEngine;
+
+namespace Timeline.Samples
+{
+    public static class QuaternionUtils
+    {
+        const float k_FloatMin = 1e-10f;
+
+        public static readonly Quaternion zero = new Quaternion(0f, 0f, 0f, 0f);
+
+        public static Quaternion Scale(this Quaternion q, float scale)
+        {
+            return new Quaternion(q.x * scale, q.y * scale, q.z * scale, q.w * scale);
+        }
+
+        public static Quaternion NormalizeSafe(this Quaternion q)
+        {
+            float dot = Quaternion.Dot(q, q);
+            if (dot > k_FloatMin)
+            {
+                float rsqrt = 1.0f / Mathf.Sqrt(dot);
+                return new Quaternion(q.x * rsqrt, q.y * rsqrt, q.z * rsqrt, q.w * rsqrt);
+            }
+
+            return Quaternion.identity;
+        }
+
+        public static Quaternion Blend(this Quaternion q1, Quaternion q2, float weight)
+        {
+            return q1.Add(q2.Scale(weight));
+        }
+
+        public static Quaternion Add(this Quaternion rhs, Quaternion lhs)
+        {
+            float sign = Mathf.Sign(Quaternion.Dot(rhs, lhs));
+            return new Quaternion(rhs.x + sign * lhs.x, rhs.y + sign * lhs.y, rhs.z + sign * lhs.z, rhs.w + sign * lhs.w);
+        }
+    }
+}