Computergrafik

OpenGL Matrix Stack Beispiel

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Realisation von $V*M*T_n$ mittels Push & Pop auf dem Matrix Stack: 

V*M
-> body
Push
   *T1
   -> wheel 1
Pop
Push
   *T2
   -> wheel 2
Pop
Push
   *T3
   -> wheel 3
Pop
Push
   *T4
   -> wheel 4
Pop

In OpenGL:

glLoadIdentity();
gluLookAt(0.0,5.0,0.0, 0.0,0.0,-10.0, 0.0,1.0,0.0); // V

glTranslated(0.0,0.0,-10.0); // M
glVertex(...); // body

glPushMatrix();
   glTranslated(-1.0,0.0,-2.0); // T1
   glVertex(...); // wheel
glPopMatrix();
glPushMatrix();
   glTranslated(1.0,0.0,-2.0); // T2
   glVertex(...); // wheel
glPopMatrix();
glPushMatrix();
   glTranslated(-1.0,0.0,2.0); // T3
   glVertex(...); // wheel
glPopMatrix();
glPushMatrix();
   glTranslated(1.0,0.0,2.0); // T4
   glVertex(...); // wheel
glPopMatrix();
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Siehe auch unter Szenengraphen!

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