Descripitve Geometry

Manipulating picture planes in order to identify true size, true shape, true length, ture angle, intersection points, and distances

• True Length Lines
• if a line is parallel to a fold line in one view, it is true length in the next view
• Point View
• find a true length line
• create a fold line perpendicular to the true length line
• type "po" for point
• change "pdmode" to 96
• change "pdsize" to .1
• True Size and Shape (TSS) Surface
• first find true length of one line and point view of that line
• crate fold line perpendicular to the true length line to get the edge view of the surface
• crate fold line parallel to edge view
• Add-A-Line
• Draw a line parallel to F1 from 1 point to the line you want true length of
• Project the point where it hits the line you want true length of to the next view onthe same line
• connect that point to the point you started with which gives you a true length line
• create fold line perpendicular to true lenth which will give you your edge view including a point
• create fold line parallel to edge view which will give you your TSS surface