DIRECTION OF LIGHT RAYS

DIRECTION OF LIGHT RAYS

The direction of the light rays S is assumed to be parallel to the diagonal of the cube, whose three faces coincide with the planes of the projections P ₁ , P ₂ and P _{3 of the} left coordinate system. Such a direction of light rays corresponds to the direction of the sun's rays at midday in the middle latitudes of our country and is considered standard .

In order to obtain a light-and-white pattern, which reveals in the best way the volumetric relief and the configuration of a building or structure in axonometry, both standard and arbitrary directions of light rays are used.