Lesson 3 – The Distance Circle

lesson_03

How to fix the position of the projection centre in space.

We draw a circle named distance circle. The centre of this circle is point , which is called principal point.

The radius of the distance circle is equal to the distance from the eye (projection centre) to the picture plane and the projection centre belongs to the perpendicular straight line passing through .

read more details in the page ‘Lesson 03’