How the third angle method differs from the first angle method

Difference Between One Angle Method and Third Angle Method :

1.Any object has eight positions in a spatial position, the so-called viewing angle. As a result, different projection views are produced.

The first angle method is also called the "Soviet" method, that is, the first view - then the real thing. The third angle method, also known as the "American" method, is characterized by seeing the real thing first - seeing the view again. In terms of its projection law, the third angle drawing method is more reasonable, because its view name is its view position, just as some friends said, it seems to be easier to draw the axis side view.

In fact, as long as you are proficient in the rules of projection, both drawing methods are the same. At present, the United States is represented by advanced capitalist countries such as Japan, Germany, and Canada.

But the United Kingdom is excluded. Former socialist countries of Eastern Europe, led by the Soviet Union.

The entire industrial system of our country was copied from the former Soviet Union in the fifties and sixties.

That set, of course, uses the first corner drawing method. At present, the painting method of Taiwan's Xianghong CAD belongs to the American painting method, so it said the above.

2.To put it simply, the first perspective is: the drawing of the physical object of your eyes, that is, the physical object is placed between the drawing and your eyes, and is projected onto the drawing from the direction of the eyes; The third perspective is:

The physical drawing is your eye, that is, the drawing is placed between the real thing and your eye, and the real thing is projected onto the drawing in the direction of your eye There is also not like the above: simply put, the left view is on the left, and the right view is on the right!

3.The first angle method is also known as the projection method, and the triangular hair is also known as the mirror image method.

The third angle method is the photo method, and the first angle method is the projection method: take the top view as an example, the top view is placed below the main view, and the third angle rule is placed above the main view.

The first and third angles are two different perspectives used to resolve graphical problems. The first angle method refers to the observation of the figure from the angle being observed, which is often referred to as the main perspective. The third angle rule refers to the observation of the figure from different angles based on the figure, and these scattered angles are often referred to as the top view and side view.

The first angle method is a direct way to solve the perspective problem, which means that the observer stands in a fixed position and observes the figure to get the visual effect of the figure. In this method, the distance between the observer and the object is constant, but the field of view can be changed as needed. The advantage of the first angle method is that objects can be observed more intuitively, especially for geometric figures, and their structure and shape can be understood more easily.

However, the first angle method also has some drawbacks, such as effects that can cause distortion or distortion because it does not take into account changes in the observer's position.

The third angle rule refers to looking at the figure from different angles to get more information. For example, the top and sides of an object can be seen from a top-down view, while the front and sides of an object can be seen from a side view. The third angle method can provide a more comprehensive and realistic image as compared to the first angle method because it takes into account the movement of the observer.

However, the third angle method also requires more complex calculations and techniques because it requires multiple angles to be considered at the same time. In addition, in practical applications, the third angle method often requires high computing and rendering speeds to ensure real-time performance.

In general, both the first and third angle methods have their own advantages and disadvantages and applicable scenarios. In practice, developers need to choose the method that suits them according to the specific situation to get the best results. <>

Distinguish from the different points of the two. The first corner is a little different from the third corner icon:

First, the characteristics of the two are different:

1. The characteristics of the first angle method icon: the direction of the projection surface of the first angle is insightful to the observer, and the direction is flipped from near to far.

2. The characteristics of the third angle method icon: the direction of the projection surface of the third angle is flipped from far to near in the direction of the observer.

Second, the overview of the two is different:

1. Overview of the first angle method icon: Where the object is placed in the first quadrant and the view is projected by the relationship between the viewpoint (observer) object and the projection plane, it is called the first angle method. Also known as the first quadrant method.

2. Overview of the third angle method icon: Where the object is placed in the third quadrant, the drawing method of projecting the view with the relationship between the viewpoint (observer) projection plane and the object is called the third angle method. Also known as the third quadrant method.

Third, the position of the two is different:

1. The position of the first corner method icon: the left view is placed on the right, the right view is placed on the left, the upper view is placed below, and so on.

2. The position of the first triangulation icon: the left view is placed on the left, the right view is placed on the right, the upper view is placed on the top, and so on.

Differences: The third perspective method, also known as the third quadrant method, is commonly known as the mirror method; The third perspective can be understood as things not moving and people moving, and the view from which side we need to see in Shenzen needs to be seen. The first-view method is also known as the first quadrant method, commonly known as the projection method.

The first perspective can just be understood as a person who does not move, and which view we need to "put down" the object into that view.

China's national standard stipulates: "technical drawings should be drawn by the orthographic projection method, and the first angle drawing method shall be preferred".

China's national standard stipulates: "technical drawings should be drawn by the orthographic projection method, and the first angle drawing method shall be preferred".

First, the first angle projection method.

1.Any drawing method in which an object is placed in the first quadrant and the view is projected in the relationship between the viewpoint (observer) and the object projection plane is called the first angle method. Also known as the first quadrant method.

2.The direction of the projection box in the first corner is reversed from near to far in the eyes of the observer. 3.

The view after the first angle method is arranged as follows, with the left view on the right side of the front view and the top view directly below the front view for the commonly used three views (main view, top view, and left view).

Two. , the third angle projection method.

1.Any painting method in which an object is placed in the third sliding quadrant and the view is projected by the relationship between the viewpoint (observer) projection plane and the object, which is called the third angle method. Also known as the third quadrant method.

2.The direction of the projection box in the third corner is reversed from far to near to the observer. 3 The six fixes after the third angle are arranged as follows, with the right view on the right side of the front view and the top view on the right side of the front view, and the top view directly above the front view.

The three views of the first state stupid angle projection method are the first angle view, and the three views of the third angle projection method are the third angle view.

Differences: Mainly the view placement position: First corner view: left view to the right, right view to the left, top view to the bottom, and so on Third corner view: left view to the left, right view to the right, top view to the top, and so on.

At present, there are two kinds of projection systems used in the world, namely the first angle projection, also known as the first angle of the collapse of the nucleus and the third angle of the projection, also known as the third angle of the painting, the difference between the two is:

1. The first angle drawing method three views are the main view, the left view, and the top view, and the third angle drawing method is just the opposite of the first angle drawing method, which is the main view, right view, and bottom view in the original position, and so on.

2. The first angle projection places the object between the observer and the projection dough hole, that is, the relative relationship between people, objects and surfaces. The third angle projection places the projection plane between the observer and the object, that is, the relative relationship between people, surfaces, and objects, and assumes that the projection surface is a transparent plane.

3. The method of projecting each projection surface at the first angle is that the h side is rotated downward, and the w side is rotated from the rear. The method of projecting the projection surface at the third angle is to rotate the h-plane upwards and the p-facing right front.

For example, the left view in the third corner view is called the right view in the first corner view