QUESTIONS FOR SELF-TESTS

1. What are visual images of objects for?

2. What are the ways to build visual images?

3. What is axonometry?

4. How to get an axonometric drawing?

5. What is the projection called secondary?

6. What is the distortion factor in axonometry?

7. What types of axonometry do you know?

8. What characterizes rectangular isometry?

9. What is the scale of the image in standard rectangular isometry?

10. How to build a circle isometry?

11. What is the characteristic of rectangular dimetry?

12. What is the scale of the image in standard rectangular dimetry?

13. How to build a circle dimetry?

14. What rules do you know by determining the direction of the major axis of the ellipse in isometry and dimetry?

15. What is the major and minor axis in isometry and dimetry?

Visual images are needed for a clearer perception of the shape and design of objects.

Construction methods: axonometry, isometry, dimetry, perspective.

Axonometry is a projection method where an object is depicted without taking into account perspective reduction.

An axonometric drawing is obtained by projecting an object onto a plane at an angle.

A secondary projection is a projection onto another plane different from the main one.

The distortion coefficient is a value showing the change in length in an axonometric projection compared to the real length.

Types of axonometry: isometry, dimetry, trimetry.

Rectangular isometry is characterized by equal angles between the axes and the same scales along all axes.

The scale in standard rectangular isometry is the same along all axes.

The isometry of a circle is constructed as an ellipse using the axes of the isometric grid.

Rectangular dimetry is characterized by two axes with the same scale and one axis with a different scale.

The scale in standard rectangular dimetry: two axes in one scale, the third in another.

The dimetry of a circle is constructed as an ellipse using the axes of the dimetric grid.

Determining the direction of the major axis of the ellipse: in isometry - an angle of 30°, in dimetry - an angle of 7° and 42°.

Major and minor axes: in isometry and dimetry depend on the angles and scale of the projection.