I have built my scene and loads so I said why not put some movement with keys. So I built the following functions to be used by glut: void MoveForward() { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, angle); angle=angle + 0.1; } void MoveBack() { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -angle); angle=angle + 0.1; } void RotateRight() { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef(angle, 0.0, 1.0, 0.0); angle=angle + 0.1; } void RotateLeft() { glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef(-angle, 0.0, 1.0, 0.0); angle=angle + 0.1; } void keyboard ( unsigned char key, int x, int y ) // Create Keyboard Function { switch ( key ) { case 'w': MoveForward(); glutPostRedisplay(); break; case 's': MoveBack(); glutPostRedisplay(); break; case 'd': RotateRight(); glutPostRedisplay(); break; case 'a': RotateLeft(); glutPostRedisplay(); break; case 'q': exit(0); break; default: break; } } The problem is that if I hit only the W button the movement is succesfull. When I hit the S instead moving back from where it was it jumos way back. The rotate does the same thing but instead it brings everything bak to the origin. I know the problem is with the matrices. I understand that in order to work I must use the last matrix transformation right? Can you help me? Thanks goes to posit and mikeman for their ideas and recommendations. [Edited by - Stranger on December 4, 2004 7:57:41 PM]

I think your method of approaching this needs some rethinking.

Generally speaking, it's best to keep track of camera position and orientation separately (for example, float cam_x, cam_y, cam_angle; or something) and to set up the view transform from scratch each frame, eg:

glPushMatrix ();

glRotatef (-cam_angle, 0.0f, 0.0f, 1.0f);

glTranslatef (-cam_x, -cam_y, 0.0f);

// do rendering...

glPopMatrix ();

My friend thank you. I thought what you said and instead thought of moving the projection and not the model and worked. I didnt use exactly your example but your idea helped me. THANK YOU.

Ok ok dont shout:) i changed it and works with model view as well but even with projection I didnt have a problem though. Thanks for the help anyway:).

[Edited by - Stranger on December 4, 2004 6:58:43 PM]