Descriptive Geometry/Piercing Points

=Piercing Points= Piercing points are nonparallel lines running through and intersecting a plane. They define the place on the plane where a line intersects it.

A) line and plane intersection creates a single point where a line passes through a plane.





Methods to solve:


 * Edge view method
 * Cutting plane method

Edge View Method
Using the Edge view method

Cutting Plane Method
Using the Cutting plane method

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Visibility
Visibility- determining the order from front to back of the solids, lines, or planes.

1)Determine a view after finding the piercing points. (ex. Top view)

2)Project down the piercing points into the other view. (ex. Front view)

3) Determine what geometric object line of projecting intersects first. That is the object that lies on top, (or closest to the figure). in the first view. (ex. top view.)\