Picture Plane (PP):-
A Transparent Imaginary Plane Of Projection. A Transparent Vertical Plane Upon
Which The Perspective Is Drawn.
The Lower Part Of The Plane Interest The Ground Plane And On The
Plan Portion View Of The Layout, It Appears As A Line Parallel To The Ground Plane And Usually Is Placed
Between The Station Point And The Object.
Ground Plane (GP):-
Is The Horizontal Plane Which Is Represented By A Line On The Elevation Portion Of
The Layout. Gp Is Always Parallel To The Horizontal Line And Represent By The Intersection Of The
Picture Plane And The Ground. This Is The Place That The View Is Standing In Plane.
Station Point (SP):-
Is the origination of the usual rays as the object is observed through the picture
plane. It will appear as a point in both plan and elevation which will fall on the horizontal. This
determines the view of the object, this determines the favourable position of the observed.
Horizon Line (HL):-
Is the eye level of the viewer. It’s the intersection of the sky and the ground and
therefore only represented on the elevation position of the drawing. It’s usually paced above the ground
line (plane) and the amount dets the height of observation since its always at the eye level and parallel
to the ground line and passes through the picture plane.
Visual Rays (VR):-
Are imaginary lines drawn from the station pt to any specific pt with the designated
scope of the plane layout of the object. The pt at which this projected lines passes through the picture
plane will det the location of that pt in perspective.
Vanishing Lines (VL):- Horizontal lines of the object which coverage on the vanishing point.
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