Feature: Use child colliders

PostProcessing/Editor/PostProcessVolumeEditor.cs

@@ -11,6 +11,7 @@ public sealed class PostProcessVolumeEditor : BaseEditor<PostProcessVolume>
 
         SerializedProperty m_IsGlobal;
         SerializedProperty m_BlendRadius;
+		SerializedProperty m_UseChildColliders;
         SerializedProperty m_Weight;
         SerializedProperty m_Priority;
 
@@ -22,6 +23,7 @@ void OnEnable()
 
             m_IsGlobal = FindProperty(x => x.isGlobal);
             m_BlendRadius = FindProperty(x => x.blendDistance);
+			m_UseChildColliders = FindProperty (x => x.useChildColliders);
             m_Weight = FindProperty(x => x.weight);
             m_Priority = FindProperty(x => x.priority);
 
@@ -48,8 +50,11 @@ public override void OnInspectorGUI()
 
             EditorGUILayout.PropertyField(m_IsGlobal);
 
-            if (!m_IsGlobal.boolValue) // Blend radius is not needed for global volumes
-                EditorGUILayout.PropertyField(m_BlendRadius);
+			if (!m_IsGlobal.boolValue)
+			{ // Blend radius is not needed for global volumes
+				EditorGUILayout.PropertyField (m_BlendRadius);
+				EditorGUILayout.PropertyField (m_UseChildColliders);
+			}
 
             EditorGUILayout.PropertyField(m_Weight);
             EditorGUILayout.PropertyField(m_Priority);

PostProcessing/Runtime/PostProcessManager.cs

@@ -130,7 +130,12 @@ public void GetActiveVolumes(PostProcessLayer layer, List<PostProcessVolume> res
 
                     // If volume isn't global and has no collider, skip it as it's useless
                     var colliders = m_TempColliders;
-                    volume.GetComponents(colliders);
+
+					if (volume.useChildColliders)
+						volume.GetComponentsInChildren (colliders);
+					else
+						volume.GetComponents(colliders);
+
                     if (colliders.Count == 0)
                         continue;
 
@@ -322,8 +327,13 @@ internal void UpdateSettings(PostProcessLayer postProcessLayer)
 
                     // If volume isn't global and has no collider, skip it as it's useless
                     var colliders = m_TempColliders;
-                    volume.GetComponents(colliders);
-                    if (colliders.Count == 0)
+
+					if (volume.useChildColliders)
+						volume.GetComponentsInChildren (colliders);
+					else
+	                    volume.GetComponents(colliders);
+
+					if (colliders.Count == 0)
                         continue;
 
                     // Find closest distance to volume, 0 means it's inside it

PostProcessing/Runtime/PostProcessVolume.cs

@@ -65,6 +65,9 @@ public sealed class PostProcessVolume : MonoBehaviour
         [Min(0f), Tooltip("Outer distance to start blending from. A value of 0 means no blending and the volume overrides will be applied immediatly upon entry.")]
         public float blendDistance = 0f;
 
+		[Tooltip("Should volumes be calculated based on colliders from children objects as well?")]
+		public bool useChildColliders = false;
+
         [Range(0f, 1f), Tooltip("Total weight of this volume in the scene. 0 means it won't do anything, 1 means full effect.")]
         public float weight = 1f;
 
@@ -156,7 +159,11 @@ void Update()
         void OnDrawGizmos()
         {
             var colliders = m_TempColliders;
-            GetComponents(colliders);
+
+			if (useChildColliders)
+				GetComponentsInChildren (colliders);
+			else
+            	GetComponents(colliders);
 
             if (isGlobal || colliders == null)
                 return;
@@ -171,16 +178,16 @@ void OnDrawGizmos()
             }
 #endif
 
-            var scale = transform.localScale;
-            var invScale = new Vector3(1f / scale.x, 1f / scale.y, 1f / scale.z);
-            Gizmos.matrix = Matrix4x4.TRS(transform.position, transform.rotation, scale);
-
             // Draw a separate gizmo for each collider
             foreach (var collider in colliders)
             {
                 if (!collider.enabled)
                     continue;
 
+				var scale = collider.transform.lossyScale;
+				var invScale = new Vector3(1f / scale.x, 1f / scale.y, 1f / scale.z);
+				Gizmos.matrix = Matrix4x4.TRS(collider.transform.position, collider.transform.rotation, scale);
+
                 // We'll just use scaling as an approximation for volume skin. It's far from being
                 // correct (and is completely wrong in some cases). Ultimately we'd use a distance
                 // field or at least a tesselate + push modifier on the collider's mesh to get a
@@ -193,8 +200,9 @@ void OnDrawGizmos()
                 if (type == typeof(BoxCollider))
                 {
                     var c = (BoxCollider)collider;
-                    Gizmos.DrawCube(c.center, c.size);
-                    Gizmos.DrawWireCube(c.center, c.size + invScale * blendDistance * 4f);
+
+					Gizmos.DrawCube(c.center, c.size);
+                	Gizmos.DrawWireCube(c.center, c.size + invScale * blendDistance * 4f);
                 }
                 else if (type == typeof(SphereCollider))
                 {