Record Type 17

17

CURVE

COORD-AXIS

COORD

ANGLE-AXIS

ANGLE

DELTA

CURVE

Name of a curve. (<=24 characters)

COORD-AXIS

The axis perpendicular to the plane in which the resulting angle is to be calculated.

1 denotes the x-axis

2 denotes the y-axis

3 denotes the z-axis

The COORD-AXIS must not be the same as the ANGLE-AXIS.

COORD

Coordinate along COORD-AXIS defining the intersection point.

ANGLE-AXIS

The parameter axis used in conjunction with ANGLE and DELTA. The ANGLE-AXIS is perpendicular to the plane in which ANGLE is given:

1 denotes the x-axis

2 denotes the y-axis

3 denotes the z-axis

If the ANGLE-AXIS is negative then ANGLE is the name of an inclination curve.

ANGLE

The angle in degrees.

If the ANGLE-AXIS is negative then ANGLE is the name of an inclination curve. Then the ANGLE is not explicitly given, but will be calculated in the intersection point from the inclination curve, whose name is given in ANGLE.

This inclination curve must have ANGLE-AXIS as the parameter axis.

If ANGLE is not an inclination curve, then ANGLE is supposed to be known in the intersection point calculated from COORD. (Note that normally the exact position along ANGLE-AXIS is not known.)

ANGLE shall be defined in the following planes:

ANGLE-AXIS=1: plane y-z

ANGLE-AXIS=2: plane x-z

ANGLE-AXIS=3: plane x-y

DELTA

Distance along ANGLE-AXIS from the intersection point.

The tangent plane of the surface is defined by

1)

The intersection point between CURVE and COORD

2)

The given ANGLE

3)

A tangent vector of CURVE in the given point.

This tangent vector is replaced by a vector along the chord from the intersection point to another point on the curve. This second point is calculated by moving the distance DELTA in the direction of ANGLE-AXIS along CURVE.