diff --git a/ege/elements/ElementPhysic.cpp b/ege/elements/ElementPhysic.cpp
index cf27e71..b60f40c 100644
--- a/ege/elements/ElementPhysic.cpp
+++ b/ege/elements/ElementPhysic.cpp
@@ -322,10 +322,12 @@ void ege::ElementPhysic::draw(int32_t _pass) {
 	if (false == m_elementInPhysicsSystem) {
 		return;
 	}
+	EGE_INFO("draw : " << _pass );
 	if (_pass == 0) {
 		if(    nullptr != m_body
 		    && nullptr != m_mesh
 		    && m_body->getMotionState() ) {
+			EGE_INFO("       plop ");
 			btScalar mmm[16];
 			btDefaultMotionState* myMotionState = (btDefaultMotionState*)m_body->getMotionState();
 			myMotionState->m_graphicsWorldTrans.getOpenGLMatrix(mmm);
diff --git a/ege/physicsShape/PhysicsBox.h b/ege/physicsShape/PhysicsBox.h
index eea0b4f..a31e9b9 100644
--- a/ege/physicsShape/PhysicsBox.h
+++ b/ege/physicsShape/PhysicsBox.h
@@ -31,6 +31,9 @@ namespace ege {
 			const vec3& getSize() const {
 				return m_size;
 			};
+			void setSize(const vec3& _size) {
+				m_size = _size;
+			}
 		public:
 			virtual const ege::PhysicsBox* toBox() const {
 				return this;
diff --git a/ege/resource/Mesh.h b/ege/resource/Mesh.h
index 2f4477b..3efc184 100644
--- a/ege/resource/Mesh.h
+++ b/ege/resource/Mesh.h
@@ -115,6 +115,9 @@ namespace ege {
 				const std::vector<std::shared_ptr<ege::PhysicsShape>>& getPhysicalProperties() const {
 					return m_physics;
 				};
+				void addPhysicElement(const std::shared_ptr<ege::PhysicsShape>& _shape) {
+					m_physics.push_back(_shape);
+				}
 			private:
 				void* m_pointerShape; //!< all mesh have a basic shape (bullet or other) the void pointer mermit to not depent on the bullet lib
 			public:
diff --git a/ege/resource/MeshEmf.cpp b/ege/resource/MeshEmf.cpp
index 012958b..310c991 100644
--- a/ege/resource/MeshEmf.cpp
+++ b/ege/resource/MeshEmf.cpp
@@ -388,7 +388,7 @@ bool ege::resource::Mesh::loadEMF(const std::string& _fileName) {
 								EGE_ERROR("Allocation error when creating physical shape ...");
 								continue;
 							}
-							m_physics.push_back(physics);
+							addPhysicElement(physics);
 							EGE_VERBOSE("            " << m_physics.size() << " " << inputDataLine);
 							currentMode = EMFModuleMeshPhysicsNamed;
 						} else if (currentMode == EMFModuleMeshPhysicsNamed) {
diff --git a/sample/RayTest/appl/Windows.cpp b/sample/RayTest/appl/Windows.cpp
index 9994c12..95b4acc 100644
--- a/sample/RayTest/appl/Windows.cpp
+++ b/sample/RayTest/appl/Windows.cpp
@@ -16,6 +16,7 @@
 #include <etk/tool.h>
 #include <ege/elements/ElementBase.h>
 #include <ege/elements/ElementPhysic.h>
+#include <ege/physicsShape/PhysicsBox.h>
 
 #undef __class__
 #define __class__ "Windows"
@@ -93,16 +94,23 @@ void appl::Windows::init() {
 	}
 	myMesh = ege::resource::Mesh::createCube(3);
 	if (myMesh != nullptr) {
-		std::shared_ptr<ege::ElementBase> element = std::make_shared<ege::ElementBase>(m_env);
-		//std::shared_ptr<ege::ElementPhysic> element = std::make_shared<ege::ElementPhysic>(m_env);
-		element->setPosition(vec3(50,0,0));
+		//std::shared_ptr<ege::ElementBase> element = std::make_shared<ege::ElementBase>(m_env);
+		std::shared_ptr<ege::ElementPhysic> element = std::make_shared<ege::ElementPhysic>(m_env);
+		element->setPosition(vec3(20,10,10));
 		element->setMesh(myMesh);
+		// add physic interface:
+		std::shared_ptr<ege::PhysicsBox> physic = std::make_shared<ege::PhysicsBox>();
+		physic->setSize(vec3(3.2,3.2,3.2));
+		myMesh->addPhysicElement(physic);
+		
 		m_env->addElement(element);
+		/*
 		element = std::make_shared<ege::ElementBase>(m_env);
 		//std::shared_ptr<ege::ElementPhysic> element = std::make_shared<ege::ElementPhysic>(m_env);
 		element->setPosition(vec3(-50,0,0));
 		element->setMesh(myMesh);
 		m_env->addElement(element);
+		*/
 	}
 }