Thiết kế flash - Oblique projections

Oblique ProjectionsOblique SketchesShow exact size and shape of one face of an objectObject face with most detail parallel to view planeRelatively easy to drawOblique AxesOblique SketchOblique Projection GeometryOne face of object parallel to projection planeParallel projectors make an oblique angle with projection planeobjectimageOblique Projection Angle (a)Angle of intersection of projector with projection planeDetermines type of oblique projection (Cavalier, Cabinet, General)Classes of Oblique ProjectionsType of Oblique Oblique Projection Angle (a)Receding Axis Scale Cavalier 45° 1Cabinet 63.43° 1/2General 45° < angle < 63.43° ½ < scale < 1 Cabinet vs CavalierCavaliera = 45°RA scale = 1Cabineta = 63.43°RA scale = 1/2Receding axisReceding Axis Angle Normally chosen to be 30 °, 45 °, or 60 °Determines relative emphasis of receding planesRelated to angle of rotation of projector about the projection plane normal (b)Receding Axis Angle - 2projectornormalOblique Projection GenerationOblique ProjectionsC’est tout!