狠狠撸

graphics oodbms hearn baker computer object oriented b level polygon doeacc reflection translation rotation tables representations sphere octree object bsp tree shear transformation computer graphics sutherland clipping hodgman computer science circle bresenham e-r model ifo database sdm semantic daplex models sam* booch coad/yourdon mellor shlaer omt data model specialization doeacc relationships generalization using instantiation aggregation inheritance torus bresenham circle