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Geometry (Conical perspective (Pictorial glossary of terms used in…

- - - - How to prepare the picture plane:
        
        First we have to create the ground and the horizon lines. Then we have to create the spectator point and the vanishing point. Finally we have to create the metric points. (The good explanation is in the portfolio)
    - - When is used the 2 pont perspective?
        
        When an object or viewpoint is rotated and two sides of an object are angled away from your view, each side of the object has it's own unique lines of perspective. You must now use 2 VP.
      - What you have to know
        
        All vertical construction lines are parallel to one another.
        
        All vertical lines constructed at the intersection point of the two lines running towards the vanishing points.
        
        All horizontal construction lines lead to a single vanishing point, based on the plane on which they are located on.
        
        All your lines extend to their respective vanishing
        point, and as a result, this choice will affect the degree of deformation your object/scene will display.
      - How to prepare the picture plane:
        
        First we have to create the ground and the horizon lines. Then we have to create the spectator point and the 2 vanishing points. Finally we have to find the metric points. (The good explanation is in the portfolio)
  - - - The picture plane (PP) is the plane that is used to record the 'picture' or 'drawing' that the eye sees.
    - - The station point or spectator point (SP) is the position at which the observer's eye is located.
    - - When drawing in perspective, the ground plane is the horizontal plane representing the ground on which the viewer is standing. It usually represents the observer's feet.
      - The different types of perspective view show how relative position of the horizon line and the ground line affects the image. Five common perspective views are:
        
        Under view (ground view)
        
        The object is over the horizon.
        
        Normal view
        
        The middle of the object is situated at the horizon.
        
        Worm's eye view
        
        The lowest part of the object is situated at the horizon.
        
        Bird's eye view
        
        The object is below the horizon.
        
        Aerid
        
        A view that shows the upper part of an object.
    - - The centre of vision is the front view of the spectator point projected onto the picture plane. It is located on the
        horizon line.
    - - When drawing in perspective, the horizon line also known as the "eye level", indicates the horizontal plane drawn at the level of the viewers eye above the ground line.