Function Entry: VLAX-CURVE-GETFIRSTDERIV

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Function Entry: VLAX-CURVE-GETFIRSTDERIV

Name

vlax-curve-getFirstDeriv

Class

Visual LISP curve function

Syntax

(vlax-curve-getFirstDeriv curve param)

Arguments and Values

  • curve — VLA-object designating a curve.
  • param — number specifying a parameter on the curve.

Description

Returns the first derivative in WCS of a curve at the specified location.

Return Values

  • 3D vector list or nil

Side Effects

None.

Availability

  • AutoCAD 2026: documented (per Autodesk reference page).
  • BricsCAD V26: presumed compatible (no contradicting page found).
  • Status: AutoCAD documented; BricsCAD presumed-both pending Phase 4 verification.