We can obtain the same shape by truncating regular polyhedra belonging to the same grouping in a certain manner . this property is called the duality of regular polyhedra 适当地将同一组多面体的角切割或将面改变例如建立球形网格,所得到的结果是相同的。
Object shapes are represented by primitive shapes ( box , cone , cylinder , sphere ) , and complexes of polytopes ( line segments , convex polygons , convex polyhedra ) 对象形状用基本形状(方框,圆锥形,圆柱,球)和复杂的多面体(线段,凸多边形,凸多面体)来表达。
The number of images including the real object formed equals the number of faces possessed by the polyhedron . needless to say , mirror wells are very useful in designing interesting 3d patterns 在这种镜井中,放入的任何物件均会产生与多面体的面数相同的像实像加镜像。
The number of images ( including the real object ) formed equals the number of faces possessed by the polyhedron . needless to say , mirror wells are very useful in designing interesting 3d patterns 在这种镜井中,放入的任何物件均会产生与多面体的面数相同的像(实像加镜像) 。
There exist only five polyhedra whose faces are all congruent regular polygons , and where the same number of faces meet at every vertex . this was disovered by the greek philosopher plato about 2 , 400 years ago 希腊哲学家柏拉图约在2 , 400年前已发现正多面体只有五种,因此这五种多面体便被统称为柏拉图方体。
4 , the optimal guaranteed control problem for a class of linear tune - delay systems with convex polyhedron uncertain parameters is considered . a state feedback controller designing method is given in terms of linear matrix inequalities 4 、针对一类具有凸多面体形式的不确定参数模型的时滞系统,研究了其保成本控制问题并得到相应控制器设计方法。