diff --git a/radiant/brush.h b/radiant/brush.h
index d6ea27ed..bf97b001 100644
--- a/radiant/brush.h
+++ b/radiant/brush.h
@@ -1737,9 +1737,16 @@ void updateFiltered(){
 
 // observer
 void planeChanged(){
-	m_planeChanged = true;
-	aabbChanged();
-	m_lightsChanged();
+	/* m_planeChanged vs m_transformChanged relationship is important
+	b4 (w/o one) cycling dependency occured:
+	transformModifier.set ; transformChanged() ; planeChanged() ; pivotChanged() ; sceneChangeNotify() ;
+	sceneRender() ; localAABB ; evaluateBRep ; buildBRep() ; evaluateTransform ; !!!problem starts here!!!! planeChanged() ; pivotChanged() ; sceneChangeNotify() ;
+	sceneRender() ; localAABB ; evaluateBRep ; buildBRep() ; */
+	if( !m_transformChanged ){
+		m_planeChanged = true;
+		aabbChanged();
+		m_lightsChanged();
+	}
 }
 void shaderChanged(){
 	updateFiltered();
@@ -1754,16 +1761,18 @@ void evaluateBRep() const {
 }
 
 void transformChanged(){
-	m_transformChanged = true;
+	//m_transformChanged = true;
 	planeChanged();
+	m_transformChanged = true; //experimental fix of cyclic dependency
 }
 typedef MemberCaller<Brush, &Brush::transformChanged> TransformChangedCaller;
 
 void evaluateTransform(){
 	if ( m_transformChanged ) {
-		m_transformChanged = false;
+		//m_transformChanged = false;
 		revertTransform();
 		m_evaluateTransform();
+		m_transformChanged = false; //experimental fix of cyclic dependency
 	}
 }
 const Matrix4& localToParent() const {
diff --git a/radiant/brush_primit.cpp b/radiant/brush_primit.cpp
index 7471468e..6726b33e 100644
--- a/radiant/brush_primit.cpp
+++ b/radiant/brush_primit.cpp
@@ -1492,7 +1492,8 @@ std::size_t planeNormalIndex( const Vector3& normal ) {
 
 void Texdef_transformLocked( TextureProjection& projection, std::size_t width, std::size_t height, const Plane3& plane, const Matrix4& identity2transformed, const Vector3 centroid ){
 	if( identity2transformed == g_matrix4_identity ){
-		return; //TODO FIXME !!! this (and whole pipeline?) is called with g_matrix4_identity after every transform
+		//globalOutputStream() << "identity2transformed == g_matrix4_identity\n";
+		return; //TODO FIXME !!! this (and whole pipeline?) is called with g_matrix4_identity after every transform //now only on freezeTransform, it seems
 	}
 	if ( g_bp_globals.m_texdefTypeId == TEXDEFTYPEID_BRUSHPRIMITIVES ) {
 #if 1
diff --git a/radiant/patch.cpp b/radiant/patch.cpp
index 9efe6738..ff7d1b18 100644
--- a/radiant/patch.cpp
+++ b/radiant/patch.cpp
@@ -302,7 +302,8 @@ void Patch::UpdateCachedData(){
 	}
 #endif
 
-	SceneChangeNotify();
+	if( !m_transformChanged ) //experimental! fixing extra sceneChangeNotify call during scene rendering
+		SceneChangeNotify();
 }
 
 void Patch::InvertMatrix(){
@@ -750,7 +751,8 @@ void Patch::AccumulateBBox(){
 		aabb_extend_by_point_safe( m_aabb_local, ( *i ).m_vertex );
 	}
 
-	m_boundsChanged();
+	if( !m_transformChanged ) //experimental! fixing extra sceneChangeNotify call during scene rendering
+		m_boundsChanged();
 	m_lightsChanged();
 }
 
diff --git a/radiant/patch.h b/radiant/patch.h
index bf7329e4..7348791c 100644
--- a/radiant/patch.h
+++ b/radiant/patch.h
@@ -619,6 +619,7 @@ const Matrix4& localToParent() const {
 	return g_matrix4_identity;
 }
 const AABB& localAABB() const {
+	const_cast<Patch*>( this )->evaluateTransform(); //experimental! fixing extra sceneChangeNotify call during scene rendering
 	return m_aabb_local;
 }
 VolumeIntersectionValue intersectVolume( const VolumeTest& test, const Matrix4& localToWorld ) const {
@@ -673,6 +674,7 @@ void transform( const Matrix4& matrix ){
 }
 void transformChanged(){
 	m_transformChanged = true;
+	m_boundsChanged(); //experimental! fixing extra sceneChangeNotify call during scene rendering
 	m_lightsChanged();
 	SceneChangeNotify();
 }
@@ -680,9 +682,10 @@ typedef MemberCaller<Patch, &Patch::transformChanged> TransformChangedCaller;
 
 void evaluateTransform(){
 	if ( m_transformChanged ) {
-		m_transformChanged = false;
+		//m_transformChanged = false;
 		revertTransform();
 		m_evaluateTransform();
+		m_transformChanged = false; //experimental! fixing extra sceneChangeNotify call during scene rendering
 	}
 }