Orthographic Projection
Engineering Drawing is a methodology to document a design in the language of an engineer.
An act of obtaining image of an object is projection. 3D projections gives a actual view of an object, how it will be after production. Perhaps 2D projections gives more detailed attributes required for an engineering design.
From the different types of projection, orthographic projections are ideally rendered for modelling of Engineering components.
To understand the theory governing the orthographic projection, few terminologies should be understood with clarity.
The picture planes where the multiple views are obtained are called Principle or Coordinate plane of projection and the perpendiculars are called Projectors.
The three planes of projections are:
- Frontal Plane: (Commonly termed as Vertical Plane: (VP) The plane on which the front and rear views obtained
- Horizontal Plane: (HP): The plane in the horizontal direction on which the top and bottom views are obtained.
- Profile Plane (PP): The auxiliary plane on which the right side and the left side views are obtained.
The line of intersection between these planes are called coordinate axes commonly known as Ground Line, Reference Line, XY Line.
The point of intersection of planes is called Origin.