What is the detailed explanation of left vision?

When you observe an object from the front, the picture you see is called the front view; When you look at an object from the left, the picture you see is called the left view. The following is what I sorted out. Welcome to reading.

What is a left view? The left view generally refers to the view obtained by orthographic projection from the left side to the right side of an object.

Left view word explanation phonetic notation: zuǒ sh? t？

Correlation: Top view, front view and left view are collectively referred to as three views of an object.

Orthographic projection, horizontal projection and side projection of the left view are called front view, top view and left view respectively. These three views are the most important for us to express the structure of objects? Three views? . Left view means that the viewpoint is on the left side of the object and projected on the right side of the object. In short: the left view is to look from the left to the right of the main view and draw it on the right of the main view (this is the standard in China).

The front view reflects the up-and-down and left-and-right positional relationship of the solid;

The top view reflects the front-back and left-right position relationship of the solid;

The left view reflects the front-back and up-and-down positional relationship of the entity.

General drawing software will involve a lot, such as cad ug proe. It is easy for beginners to confuse the simple legends of the left view and the right view. Left view means that the viewpoint is on the left side of the object and projected on the right side of the object; The same is true of the right view.

Teaching objectives of front view, left view and top view teaching plan

1. Knowledge and skills: Let students realize that observing the same object from different directions may lead to different results, realize the three views of a simple object, realize the practical significance of the three views of an object, and draw three views from the real thing.

2. Process and method: Through painting, cultivate students' observation, hands-on ability and spatial imagination, infiltrate the transformation between two-dimensional space and three-dimensional space of graphics, and develop students' spatial concept.

3. Emotion and attitude: The introduction of the topic enables students to understand that mathematics comes from and serves the process of practice, improve the application consciousness of mathematics, infiltrate the idea of mutual transformation between things, and learn to communicate and cooperate.

Teaching focus

Can know the three views of simple objects, understand the rationality of the three views of objects, and draw three views of simple and regular three-dimensional graphics.

Teaching difficulties: drawing three views of three-dimensional graphics and their simple combination.

teaching process

Take a look.

Situation 1: What can you get from comics?

Scenario 2: Looking back at primary school? Observing objects? .

(2) learn to learn.

The figure seen from the front is called the main view; The graph seen from the left is called the left view; The figure seen from above is called a top view. The figures seen from these three directions are called three views of the object. By drawing three views, a three-dimensional figure can be transformed into a plane figure.

(3) Give it a try

Observe the objects shown in the table below and draw the figures you see in the table.

Observe the object angle of cylindrical cone prism

From the front

(main view)

Look to the left from above (left view).

(Top view) 1

(4) think about it.

There is a cuboid and a cylinder on the desktop. Please talk about its front view, left view and top view.

( ) ( ) ( )

(5) practice.

Fill in the corresponding brackets with the names of the three views of the objects shown in the picture to complete the three views.