responded to second round of PR feedback

com.unity.perception/Runtime/Randomization/Randomizers/SampleRandomizers/Randomizers/ColorRandomizer.cs

             var taggedObjects = tagManager.Query<ColorRandomizerTag>();
             foreach (var taggedObject in taggedObjects)
             {
-                var renderer = taggedObject.GetComponent<MeshRenderer>();
+                var renderer = taggedObject.GetComponent<Renderer>();
                 renderer.material.SetColor(k_BaseColor, colorParameter.Sample());
             }
         }

com.unity.perception/Runtime/Randomization/Randomizers/SampleRandomizers/Randomizers/RotationRandomizer.cs

 using System;
 using UnityEngine.Experimental.Perception.Randomization.Parameters;
 using UnityEngine.Experimental.Perception.Randomization.Randomizers.SampleRandomizers.Tags;
+using UnityEngine.Experimental.Perception.Randomization.Samplers;
 
 namespace UnityEngine.Experimental.Perception.Randomization.Randomizers.SampleRandomizers
 {
         /// <summary>
         /// Defines the range of random rotations that can be assigned to tagged objects
         /// </summary>
-        public Vector3Parameter rotation = new Vector3Parameter();
+        public Vector3Parameter rotation = new Vector3Parameter
+        {
+            x = new UniformSampler(0, 360),
+            y = new UniformSampler(0, 360),
+            z = new UniformSampler(0, 360)
+        };
 
         /// <summary>
         /// Randomizes the rotation of tagged objects at the start of each scenario iteration

com.unity.perception/Runtime/Randomization/Randomizers/SampleRandomizers/Tags/ColorRandomizerTag.cs

     /// <summary>
     /// Used in conjunction with a ColorRandomizer to vary the material color of GameObjects
     /// </summary>
+    [RequireComponent(typeof(Renderer))]
     [AddComponentMenu("Perception/RandomizerTags/Color Randomizer Tag")]
     public class ColorRandomizerTag : RandomizerTag { }
 }

com.unity.perception/Runtime/Randomization/Scenarios/ScenarioBase.cs

             }
             foreach (var randomizer in m_Randomizers)
                 randomizer.Create();
+            ValidateParameters();
         }
 
         void OnEnable()