Architectural drawing (three views and their geometric relationships)

There are a few missing lines in the picture above. In the front and top views, the four ridges of the vertebral body are not drawn.

Analysis, it is not easy to describe it in words.

This is a four-edged vertebral body. Remove a piece from one of the edges; then make a diagonal cut at the top.

Can you tell me the steps to do the question? (The steps below are only for this question, other questions are similar). If you can draw pictures, you don’t need to read the following.

1. First, judge the approximate shape of the object based on the line segments given in the picture (for example, in this question, the basic shape is a four-sided pyramid. In each picture, you can use a dotted line to outline the basic shape. draw it). Draw based on views that reflect more information about the shape of objects.

2. Draw a horizontal line through the uppermost edge of the outer contour of the top view; draw a vertical line at the far left edge of the outer contour of the right view. Intersect with the "O" point.

3. Find the intersections or vertices of all the lines in the right view, including the points where they intersect after being extended (all these points are key points).

4. From the key point of the right view, make a vertical line to intersect with the horizontal line made first. With point O as the center of the circle and the intersection point as the radius, make different circles that intersect with the vertical lines made first, and then use these intersection points to make horizontal lines. These horizontal lines intersect with the lines in the top view, and the key points of the top view are determined based on the corresponding relationship with the key points of the right view. If you can't be sure, let's not decide for now and wait for improvement later.

5. In the same way, draw a horizontal line from the key points of the right view, intersect with the line of the main view, and determine the key points of the main view based on the corresponding relationship with the key points of the right view.

6. Based on the key points of each of the three pictures, determine the key points of other pictures. Connect these key points with lines according to the corresponding relationships in each picture. The picture is complete.