Function Entry: VLAX-CURVE-ISPLANAR

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Function Entry: VLAX-CURVE-ISPLANAR

Name

vlax-curve-isPlanar

Class

Visual LISP curve predicate

Syntax

(vlax-curve-isPlanar curve)

Arguments and Values

curve — VLA-object to test.

Description

Determines whether there is a plane that contains the curve.

Return Values

T if the curve is planar
nil otherwise

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.

Source Notes

[vlax-curve-isPlanar (AutoLISP/ActiveX)](https://help.autodesk.com/cloudhelp/2026/ENU/AutoCAD-LT-AutoLISP-Reference/files/GUID-798B0177-0B90-4393-AF9D-C1D4607A0E7F.htm)

Compatibility

Available only on Windows; not available on macOS or Web.