diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 6666328271..96e6863727 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -79,6 +79,14 @@ namespace OpenSim.Region.Framework.Scenes
         /// </summary>
         public bool m_physicalPrim;
 
+        /// <summary>
+        /// Controls whether prims can be collided with.
+        /// </summary>
+        /// <remarks>
+        /// If this is set to false then prims cannot be subject to physics either.
+        /// </summary>
+        public bool CollidablePrims { get; private set; }
+
         public float m_maxNonphys = 256;
         public float m_maxPhys = 10;
         public bool m_clampPrimSize;
@@ -651,6 +659,7 @@ namespace OpenSim.Region.Framework.Scenes
                 m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);
 
                 m_physicalPrim = startupConfig.GetBoolean("physical_prim", true);
+                CollidablePrims = startupConfig.GetBoolean("collidable_prim", true);
 
                 m_maxNonphys = startupConfig.GetFloat("NonPhysicalPrimMax", m_maxNonphys);
                 if (RegionInfo.NonphysPrimMax > 0)
diff --git a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
index b29ecc6465..8fd136d373 100644
--- a/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneObjectPart.cs
@@ -1473,6 +1473,9 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="VolumeDetectActive"></param>
         public void ApplyPhysics(uint rootObjectFlags, bool VolumeDetectActive)
         {
+            if (!ParentGroup.Scene.CollidablePrims)
+                return;
+
 //            m_log.DebugFormat(
 //                "[SCENE OBJECT PART]: Applying physics to {0} {1}, m_physicalPrim {2}",
 //                Name, LocalId, UUID, m_physicalPrim);
@@ -4318,7 +4321,7 @@ namespace OpenSim.Region.Framework.Scenes
                 if (ParentGroup.Scene == null)
                     return;
 
-                if (PhysActor == null)
+                if (ParentGroup.Scene.CollidablePrims && PhysActor == null)
                 {
                     // It's not phantom anymore. So make sure the physics engine get's knowledge of it
                     PhysActor = ParentGroup.Scene.PhysicsScene.AddPrimShape(
diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index 972efe4ae2..3e7f8a626f 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -181,6 +181,11 @@
     ; ## PHYSICS
     ; ##
 
+    ; If true then prims can be collided with by avatars, other prims, etc.
+    ; If false then all prims are phantom, no matter whether their phantom flag is checked or unchecked.
+    ; Also, no prims are subject to physics.
+    collidable_prim = true
+
     ; If true then prims can be made subject to physics (gravity, pushing, etc.).
     ; If false then physics flag can be set but it is not honoured.  However, prims are still solid for the purposes of collision direction
     physical_prim = true