diff --git a/main.go b/main.go
index 0a855ed..439de67 100755
--- a/main.go
+++ b/main.go
@@ -99,7 +99,7 @@ func main() {
 	s.AddActor(dynCapsule.ToActor())
 
 	//Add compound shape
-	dynComp := p.CreateRigidDynamic(pgo.NewTransform(pgo.NewVec3(0, 35, 0), qID))
+	dynComp := p.CreateRigidDynamic(pgo.NewTransform(pgo.NewVec3(2.5, 35, 0), qID))
 
 	pgo.CreateExclusiveShape(dynComp.ToRigidActor(), pgo.NewBoxGeometry(10, 0.1, 0.1).ToGeometry(), pMat, pgo.ShapeFlags_eSCENE_QUERY_SHAPE|pgo.ShapeFlags_eSIMULATION_SHAPE|pgo.ShapeFlags_eVISUALIZATION)
 
diff --git a/pgo/pgo.go b/pgo/pgo.go
index e03f80b..c892f76 100755
--- a/pgo/pgo.go
+++ b/pgo/pgo.go
@@ -241,7 +241,7 @@ type Physics struct {
 
 func (p *Physics) CreateScene(sd *SceneDesc) *Scene {
 	return &Scene{
-		cS: C.CPxPhysics_createScene(p.cPhysics, sd.cSD),
+		cS: C.CPxPhysics_createScene(p.cPhysics, &sd.cSD),
 	}
 }
 
@@ -365,22 +365,22 @@ func DefaultCpuDispatcherCreate(numThreads, affinityMasks uint32) *DefaultCpuDis
 }
 
 type SceneDesc struct {
-	cSD *C.struct_CPxSceneDesc
+	cSD C.struct_CPxSceneDesc
 }
 
 func (sd *SceneDesc) SetGravity(v *Vec3) {
-	C.CPxSceneDesc_set_gravity(sd.cSD, v.cV)
+	C.CPxSceneDesc_set_gravity(&sd.cSD, v.cV)
 }
 
 func (sd *SceneDesc) SetCpuDispatcher(cd *CpuDispatcher) {
-	C.CPxSceneDesc_set_cpuDispatcher(sd.cSD, cd.cCpuDisp)
+	C.CPxSceneDesc_set_cpuDispatcher(&sd.cSD, cd.cCpuDisp)
 }
 
 //SetOnContactCallback sets the GLOBAL contact callback handler. Physx-c currently only supports 1 contact callback handler.
 //Setting a contact callback handler overrides the previous one. Only the most recent one gets called.
 func (sd *SceneDesc) SetOnContactCallback(cb func(ContactPairHeader)) {
 	contactCallback = cb
-	C.CPxSceneDesc_set_onContactCallback(sd.cSD, (C.CPxonContactCallback)(unsafe.Pointer(C.goOnContactCallback_cgo)))
+	C.CPxSceneDesc_set_onContactCallback(&sd.cSD, (C.CPxonContactCallback)(unsafe.Pointer(C.goOnContactCallback_cgo)))
 }
 
 func NewSceneDesc(ts *TolerancesScale) *SceneDesc {
diff --git a/pgo/physx-c/CPxSceneDesc.h b/pgo/physx-c/CPxSceneDesc.h
index 221aed4..3f65633 100755
--- a/pgo/physx-c/CPxSceneDesc.h
+++ b/pgo/physx-c/CPxSceneDesc.h
@@ -20,9 +20,16 @@ extern "C" {
 	/// </summary>
 	/// <param name="CPxTolerancesScale"></param>
 	/// <returns></returns>
-	CPxAPI CSTRUCT CPxSceneDesc* NewCPxSceneDesc(CSTRUCT CPxTolerancesScale);
+	CPxAPI CSTRUCT CPxSceneDesc NewCPxSceneDesc(CSTRUCT CPxTolerancesScale);
 	CPxAPI void CPxSceneDesc_set_gravity(CSTRUCT CPxSceneDesc*, CSTRUCT CPxVec3);
 	CPxAPI void CPxSceneDesc_set_cpuDispatcher(CSTRUCT CPxSceneDesc*, CSTRUCT CPxCpuDispatcher*);
+
+
+	//CPxSceneDesc_set_onContactCallback sets the contact callback handler of the given scene descriptor.
+	//The callback is sent an object of type 'CPxContactPairHeader*'. This object is only valid for the duration of the callback handler.
+	//Therefore, the callback handler MUST copy data it wishes to keep for longer than the lifetime of the callback handler, as the memory it was handed might be reused/freed.
+	//
+	//NOTE: This function assumes you are using the default physx-c callback handler. Do NOT use this function if you set 'sceneDesc->simulationEventCallback' with your own custom implementation.
 	CPxAPI void CPxSceneDesc_set_onContactCallback(CSTRUCT CPxSceneDesc*, CPxonContactCallback cb);
 	CPxAPI void FreeCPxSceneDesc(CSTRUCT CPxSceneDesc*);