Orthographic Projections: Points, Lines, and Planes Information
Explore the world of orthographic projections with clear illustrations and guidelines for representing points, lines, and planes in different views. Learn about projections of points in the first quadrant, straight lines, and orthographic patterns for TV and VP. The content covers various scenarios including vertical lines, lines parallel to HP and VP, inclined lines, and more.
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Presentation Transcript
Projections of points, lines and planes
NOTATIONS FOLLOWING NOTATIONS SHOULD BE FOLLOWED WHILE NAMEING DIFFERENT VIEWS IN ORTHOGRAPHIC PROJECTIONS. OBJECT POINT A LINE AB IT S TOP VIEW a a b IT S FRONT VIEW a a b IT S SIDE VIEW a a b SAME SYSTEM OF NOTATIONS SHOULD BE FOLLOWED INCASE NUMBERS, LIKE 1, 2, 3 ARE USED.
PROJECTIONS OF A POINT IN FIRST QUADRANT POINT A IN HP & INFRONT OF VP POINT A ABOVE HP & IN VP POINT A ABOVE HP & INFRONT OF VP For Tv For Tv For Tv PICTORIAL PRESENTATION PICTORIAL PRESENTATION A a a A Y Y Y a a a X X X A a ORTHOGRAPHIC PRESENTATIONS OF ALL ABOVE CASES. Fv above xy, Tv below xy. Fv above xy, Tv on xy. Fv on xy, Tv below xy. VP VP VP a a a X Y X Y X Y a a a HP HP HP
PROJECTIONS OF STRAIGHT LINES INFORMATION REGARDING A LINE means IT S LENGTH, POSITION OF IT S ENDS WITH HP & VP IT S INCLINATIONS WITH HP & VP WILL BE GIVEN. AIM:- TO DRAW IT S PROJECTIONS - MEANS FV & TV. SIMPLE CASES OF THE LINE 1. A VERTICAL LINE ( LINE PERPENDICULAR TO HP & // TO VP) 2. LINE PARALLEL TO BOTH HP & VP. 3. LINE INCLINED TO HP & PARALLEL TO VP. 4. LINE INCLINED TO VP & PARALLEL TO HP. LINE INCLINED TO BOTH HP & VP. STUDY ILLUSTRATIONS GIVEN ON NEXT PAGE SHOWING CLEARLY THE NATURE OF FV & TV OF LINES LISTED ABOVE AND NOTE RESULTS. 5.
Orthographic Pattern For Tv (Pictorial Presentation) V.P. a Note: a Fv is a vertical line Showing True Length & Tv is a point. A Fv 1. FV b A Line b Y perpendicular to Hp & // to Vp X Y B a b TV Tv a b X H.P. Orthographic Pattern V.P. (Pictorial Presentation) Note: For Tv Fv & Tv both are // to xy & both show T. L. 2. Fv a b b A Line // to Hp & // to Vp B a X Y Y A b a b Tv X a H.P.
V.P. Fv inclined to xy Tv parallel to xy. b 3. b B A Line inclined to Hp and parallel to Vp a Y X Y a a (Pictorial presentation) b A T.V. b X a H.P. Orthographic Projections V.P. Tv inclined to xy Fv parallel to xy. 4. Fv a b b A Line inclined to Vp and parallel to Hp a B A X Y a (Pictorial presentation) Tv b a b H.P.
For Tv For Tv A Line inclined to both Hp and Vp 5. b b (Pictorial presentation) B B Y Y a On removal of object i.e. Line AB Fv as a image on Vp. Tv as a image on Hp, a A A X a b X T.V. a b T.V. V.P. b FV a X Y Orthographic Projections Fv is seen on Vp clearly. To see Tv clearly, HP is rotated 900downwards, Hence it comes below xy. Note These Facts:- Both Fv & Tv are inclined to xy. (No view is parallel to xy) Both Fv & Tv are reduced lengths. (No view shows True Length) a TV H.P. b
