Lesson 4 – The reference plane

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This lesson is dedicated to the perspective of a plane, particularly the reference horizontal plane π1.

The observer O, standing on the reference plane π1, looks ahead of him and sees:

  • the horizon i’
  • the line t, that the reference plane and the picture plane have in common.

These two lines represent the reference horizontal plane π1.

read more details in the page ‘Lesson 4’