A point is simply a space location of infinitesimal size. It may represent the corner of an object, the intersection of two lines or a designated spot in space. The projection obtained on vertical plane VP is called the elevation and on horizontal plane HP, the plan. The intersection line of the vertical plane and the horizontal plane is known as ground line or reference line.
Position of points:
(i) In front of the VP and above the HP
(ii) In front of the VP and in the HP
(iii) In the VP and above the HP
(iv) Behind the VP and above the HP
(v) Behind the VP and in the HP
(vi) Behind the VP and below the HP
(vii) In the VP and below the HP
(viii) In front of the VP and below the HP
(ix) In the VP and HP
