If you master it, you can draw all orthography.

San xiaodian

1, change the right angle of the rectangular coordinate system into an angle of 45.

2, the horizontal length is unchanged, and the longitudinal length is halved.

3. The parallel positional relationship remains unchanged, and the parallel relationship in the plan view is still parallel after being made to look straight.

Others will have certain changes, and it is difficult to maintain the original positional relationship.

main points

In the process of conversion between orthographic drawing and plan drawing, we must find the height (vertical line in horizontal direction), determine the vertical relationship first, and then connect the vertices.

It is better to use the coordinate system to transform, so it is easier to find the vertical relationship.