Hi together, just for fun I modified lesson 5 to implement a waving bezier face. Allthough it's not a real great thing, but I don't want to withhold it. For anyone, who want to try it out: - declare two global variables GLfloat bparm=1.0f; // Parameter For The Bezier Curve short incdec=1; // Swap Increment/Decrement - take this DrawGLScene code int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); GLfloat pointMatrix[]= {0.0f,0.0f,0.0f, 0.0f,2.0f,0.0f, 0.0f,4.0f,0.0f, 0.0f,6.0f,0.0f, 1.0f,0.0f,0.0f, 1.0f,2.0f,0.0f, 1.0f,4.0f,-1*bparm, 1.0f,6.0f,0.0f, 2.0f,0.0f,0.0f, 2.0f,2.0f,0.0f, 2.0f,4.0f,bparm, 2.0f,6.0f,0.0f, 3.0f,0.0f,0.0f, 3.0f,2.0f,0.0f, 3.0f,4.0f,0.0f, 3.0f,6.0f,0.0f}; glEnable(GL_MAP2_VERTEX_3); glMap2f(GL_MAP2_VERTEX_3,0,1,12,4,0,1,3,4,pointMatrix); glMapGrid2f(20,0,1,20,0,1); glPushMatrix(); glTranslatef(-2.5f,-2.5f,-10.0f); glRotatef(45,0.5f,0.5f,0.0f); glEvalMesh2(GL_LINE,0,20,0,20); glPopMatrix(); if(bparm>40.0f){ incdec=-1; }else if(bparm<-40.0f){ incdec=1; } bparm+=(incdec*0.2f); return TRUE; } Have fun... RAPsody