"Projection" Projection and View PPT Courseware 3

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"Projection" Projection and View PPT Courseware 3

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Take some small wooden sticks, triangular and rectangular pieces of paper of different lengths and observe their shadows in the sun.

(1) Fix the projection surface (that is, the plane where the shadow is located), and change the position and direction of the small wooden stick or piece of paper. What changes will happen to their shadows?

(2) Fix small wooden sticks or pieces of paper, and change the position and direction of the projection surface. What changes will happen to their shadows?

As shown in the picture, can you draw the shadow of the wooden pole B at this time?

1. Draw straight line DD’,

2. Draw a parallel line DD’ through E, and intersect the straight line AD’ at point E’. BE’ is the shadow of rod B.

Have you ever thought about it?

1. Beibei and his father are walking on the beach in the sun. He doesn’t want his father to see his shadow. So can you draw the general range of Beibei’s activities? (Use a line segment to represent his shadow)

As long as Beibei's shadow overlaps with Dad's shadow, Dad can't see his shadow.

Therefore, Beibei's approximate range of activity is that the line segment is within the length of MN.

What were the takeaways from this lesson?

When an object is illuminated by light, it will leave its shadow on the ground or wall. This is the phenomenon of projection.

Sun rays can be seen as parallel rays, and the projection formed by such rays is called parallel projection.

During the day, the direction of the object's shadow is:

West---Northwest---North---Northeast---East.

During the day, the changing pattern of shadow length is "long---short---long".

At the same moment, the height ratio of the object and the shadow length ratio are equal.

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Update Time: 2024-11-25

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