Ok, I've a little problem, I'm trying to put a light like a camera flash, so I'm setting the position of the Light just after I loaded the identity matrix in the modelmatrix, like the red book says, but it doesn't work, the light still moving with the object... I'm using GLUT and thise is part of the display callback function code; void DisplayX(void) { GLUquadricObj *MyQuadric; GLfloat lightPos[] = { 0.0f, 0.0f, 0.0f, 1.0f }; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(20.0f, 1.0f, 1.0f, 10.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLight); glLightfv(GL_LIGHT0,GL_DIFFUSE,ambientLight); glLightfv(GL_LIGHT0,GL_SPECULAR,specular); glLightfv(GL_LIGHT0,GL_POSITION,lightPos); gluLookAt(0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); glMaterialfv(GL_FRONT, GL_SPECULAR,specref); glMateriali(GL_FRONT, GL_SHININESS,128);

Sorry, maybe I forgot some details about the programm, in the programm you can rotate a Quadric with the mouse, translate it with the key pads and scalete it with other keys, so when you do all this the transformation should not modificate the position of the light, that's what I´m trying to do...

Thanks for posting, I have solved the problem, the problem was that I was redefining the position of the light every time that it was redered, so what I did was to put the light setup in other funcion and the light position would stay fixed to the camera....