在简单光反射模型中,由物体表面上点反射到视点的光强是下述哪几项之和?()
(1)环境光的反射光强;(2)理想漫反射光强;(3)镜面反射光强;(4)物体间的反射光强。
A(1)和(2)
B(1)(2)和(3)
C(1)和(3)
D(1)(2)(3)和(4)
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下述绕坐标原点逆时针方向旋转a 角的坐标变换矩阵中哪一项是错误的?()
| A B | | C D |
A -cos a;
B-sin a;
Csin a;
Dcos a
使用下列二维图形变换矩阵:
T =⎥⎥⎥⎦
⎤⎢⎢⎢⎣⎡100001010 产生图形变换的结果为 ()
A绕原点逆时针旋转90度;
B以Y=X 为对称轴的对称图形;
C以Y=-X 为对称轴的对称图形;
D绕原点顺时针旋转90度。
透视投影中的灭点最多可以有几个?()
A 无限;
B 1;
C 2;
D 3
According to Paragraph 4, which one of the following is not characteristic of early-twentieth century urban neighborhoods?
A. Mixing housing of different prices and styles.
B. Offering residents a "gratifying public realm" .
C. Forcing residents to drive, often in heavy traffic.
D. Giving people of diverse backgrounds and lifestyles an opportunity to interact and thus develop mutual respect.