getFractionToDistanceScale Method

If the curve primitive has distance-along-curve strictly proportional to curve fraction, return the scale factor. If distance-along-the-curve is not proportional, return undefined.

• When defined, the scale factor is always the length of the curve.
• This scale factor is typically available for these curve types:
• • All LineSegment3d
• • Arc3d which is a true circular arc (axes perpendicular and of equal length).
• • CurveChainWithDistanceIndex
• This scale factor is undefined for these curve types:
• • Arc3d which is a true ellipse, i.e. unequal lengths of defining vectors or non-perpendicular defining vectors.
• • bspline and bezier curves

getFractionToDistanceScale(): undefined | number

@returns scale factor or undefined

Returns - undefined | number

scale factor or undefined

Defined in

• curve/CurvePrimitive.ts Line 585