Animation Tutorials

 
 
This figure is similar to the previous one, except that the extremity A of the given line is raised from the ground, but the same demonstration applies to it.
 
 

 
 
And now let us suppose the vertical plane K to be a sheet of glass, and the given line AE to be the visual [...]

The conditions of linear perspective are somewhat rigid. In the first place, we are supposed to look at objects with one eye only; that is, the visual rays are drawn from a single point, and not from two. Of this we shall speak later on. Then again, the eye must be [...]