NOTE: The CTANF statement does not correctly scale the tangent
returned for a normalized parameter. The CPROPF statement correctly scales the
tangent it returns.Overview | Statement List | Example
CPROPF(obj,parameter)
Returns the point, tangent, unit principal normal, unit binormal, torsion, and radius of curvature of a curve at a given parameter. The parameter is assumed to be normalized.
This statement returns a fourteen element array containing the point (1-3), tangent (4-6), unit principal normal (7-9), unit binormal (10-12), torsion (13), and radius of curvature (14).
The following statements also allow you to obtain similar data:
CPARF allows you to obtain the parameter of a curve at a given point.
CPOSF and CTANF statements allow you to calculate a point on a curve and tangent at that point given a parameter.
NOTE: The CTANF statement does not correctly scale the tangent
returned for a normalized parameter. The CPROPF statement correctly scales the
tangent it returns.
|
Parameter |
Description |
|
obj |
Object identifier of the curve. |
|
parameter |
Parameter value on curve at which to calculate the data. |