Study on Axsometric Scale in Perspective Projection (3)

Abstract

When the picture plane is not perpendicular to the ground plane, there exist three vanishing points. In this case, we studied on a method to draw a perspective by using axsometric scale.For a straight line, lying on the ground plane and parallel to x or y axis, axsometric scale is intersecting points of total perspect of this straight line and a group of straight lines.They are total perspects of parallels lying on the ground plane. Inclination angles of parallels to both axes are 45° and their intervals are constant.For a straight line, parallel to z axis, axsometric scale is intersecting points of total perspect of this straight line and a group of straight lines. They are total perspects of parallels lying on a plane on which this straight line lies. Parallels are horizontal and their intervals are constant.