3. Standard material has a diffuse shading model that does an excellent job of rendering solid, non reflective objects such as plastic, ceramic, and so on. ��������һ����������ɫģʽ���������Ⱦ���塢�Լ��Ƿ�������������ϡ��մɵȵȵ�Ч���Ǽ��õġ�
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n.
1. graded markings that indicate light or shaded areas in a drawing or painting
2. a gradation involving small or imperceptible differences between grades