### Constructing a Pierce Point

A point can be constructed using a line (circle, cone, ellipse, slot, or cylinder) and a circle, ellipse or plane (cone, cylinder, or sphere). PC-DMIS will create a point where feat_1 pierces the surface of feat_2.

Note: For this construction method you must select feature types in the correct order.

- If the pierced feature is a circle or an ellipse, PC-DMIS creates a cylindrical circumference about the centerline, and constructs the pierce point. If two similar features (two cylinders for example) are provided, PC-DMIS will pierce the second feature with the first feature.

- If the pierced feature is a sphere, circle, cone, or cylinder the pierce point is constructed where the piercing input feature first intersects the surface of the pierced element. The first intersection point is determined by the direction of the line. It is important to know the direction in which the line was defined. If the wrong point is constructed, create a new, flipped line (see "Changing the Direction of a Line"), and use it to construct the point.

To construct a Pierce Point:

1. Access the Construct Point dialog box (Insert | Feature | Constructed | Point).

2. Select the Pierce option from the list of options.

3. Select the first feature. It must be either a cone, cylinder, line, slot, circle, or ellipse.

4. Select the second feature. It must be either an ellipse, circle, cone, cylinder, plane, or sphere.

5. Click the Create button.

The Edit window command line for this option would read:

CONSTR/POINT,PIERCE,feat_1,feat_2

Constructing a Pierce Point from a Line and a Sphere | A - Point constructed at the intersection of a line and sphere B - Sphere feature C - Line (please note direction)