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# 一、立体上点的三面投影 二、空间二点的相对位置 三、重影点的判别与标注 四、练习题 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '一、立体上点的三面投影 二、空间二点的相对位置 三、重影点的判别与标注 四、练习题' - yolanda-henderson

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PROJECTION OF PINTS立体上点的投影

1. 空间一点A的投影

0

2. 点的三面投影规律

Z

Y

X

Y

3. 点的坐标与投影的关系

A

a’’

a’

a

（1）画出坐标原点及各轴;

（2）根据A点的坐标求其V、H面的投影a’,a;

（3）根据点的投影规律求出第三投影a”。

A与B二点的相对位置:

A

B

（1）根据B的相对位置求

（2）根据点的投影规律

A

B

C

D

• 例3. 已知C点距W面5、距V面10、距H面10 mm,
• D点距W面15、距V面10、距H面5 mm，求
• C、D二点的三面投影,并判别其可见性。

（C）

1.求C点的三投影c,c’,c”;

2.求D点的三投影d,d’,d”

a’

a’’

b’

a’’

b’’

c’

b’’(c’’)

c’’

a

b

c

(1)

(2)

a’

b’

c’

a c

b

( )