Wikibooks

Descriptive Geometry/General method of rotation

< Descriptive Geometry

To rotate an object:

  1. Find a line axis: if rotating a point or a line, the subject cannot be incident with the axis (the point cannot be on the axis)
  2. Find the center of rotation: it is the line of axis in point view
  3. Find the path of rotation: The plane of rotation is perpendicular to the line axis. When viewing the plane of rotation in true shape, the path of rotation is a circular one. The radius of rotation is the distance between the subject and the center of rotation.

Rotation in various views:

  1. Viewing the line in point view: construct the circular path directly
  2. Viewing the line in oblique views: Find the line in true length and point view, then apply the construction above
Retrieved from "https://en.wikibooks.org/w/index.php?title=Descriptive_Geometry/General_method_of_rotation&oldid=2538522"