Fix for timestamps

com.unity.perception/Runtime/GroundTruth/Labelers/AnimationPoseLabel.cs

     public class PoseTimestampRecord
     {
         /// <summary>
-        /// The duration to use for this timestamp in seconds
+        /// The point in the clip that the pose starts, a value from 0 (beginning) to 1 (end)
-        public float duration;
+        public float startOffset;
         /// <summary>
         /// The label to use for any captures inside of this time period
         /// </summary>
         /// <returns>The pose for the passed in time</returns>
         public string GetPoseAtTime(float time)
         {
-            var totalTime = 0f;
+            if (time < 0 || time > 1) return "unset";
-            // The amount of timestamps are expected to be small, so at the current time
-            // no performance improvements are deemed necesssary
-            foreach (var t in timestamps)
+            var i = 1;
+            for (i = 1; i < timestamps.Count; i++)
-                totalTime += t.duration;
-                if (time < totalTime) return t.poseLabel;
+                if (timestamps[i].startOffset > time) break;
-            return timestamps.Last().poseLabel;
+            return timestamps[i - 1].poseLabel;
         }
     }
 }

com.unity.perception/Runtime/GroundTruth/Labelers/KeyPointLabeler.cs

                 {
                     if (p.animationClip == clip)
                     {
-                        var time = clip.length * timeOffset;
+                        var time = timeOffset;
                         var label = p.GetPoseAtTime(time);
                         return label;
                     }

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/AnimationRandomizer.cs

             animator.applyRootMotion = tag.applyRootMotion;
 
             var overrider = tag.animatorOverrideController;
-            if (overrider != null)
+            if (overrider != null && tag.animationClips.GetCategoryCount() > 0)
             {
                 overrider[clipName] = tag.animationClips.Sample();
                 animator.Play(stateName, 0, m_FloatParameter.Sample());