fractionToPointAndDerivative MethodAbstract

Return the point (x,y,z) and derivative on the curve at fractional position.

  • Note that this derivative is "derivative of xyz with respect to fraction."
  • this derivative shows the speed of the "fractional point" moving along the curve.
  • this is not generally a unit vector. use fractionToPointAndUnitTangent for a unit vector.

fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d

Parameter Type Description
fraction number fractional position along the geometry.
result Ray3d  

Returns - Ray3d

Returns a ray whose origin is the curve point and direction is the derivative with respect to the fraction.

Defined in

Last Updated: 20 June, 2023