R 9/21

1. Review paint.c
2. Review display lists (mentioned in slide set 9).

     id = glGenLists(1);
     glNewList( id, GL_COMPILE or GL_COMPILE_AND_EXECUTE );  
     glPushAttrib(GL_ALL_ATTRIB_BITS); (opt)
     glPushMatrix();  (opt)
     /*  Draw your objects here */
     glPopMatrix();
     glPopAttrib();
     glEndList();
     ...
     glCallList(id);
   
   
3. Slide set 10 - Geometry
   1. Scalar, e.g., real
   2. Vector (a,b,c) - displacement, velocity, etc
   3. Vector space - add/subtract vectors, multiply by scalars
   4. Affine space - add point to vector to make new point
   5. etc

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