Project using Iplane option failing

Version 8 SR31 (8.31.26126.13431, 2026-05-06)

Project using Iplane with a Named Cplane as target only projects part of the selected objects if the Named Cplane is not normal to the direction of projection.

Project Iplane Fail DC01.3dm (2.0 MB)

Example:

Select curves and points to project. Press Enter when done ( Loose=No DeleteInput=No OutputLayer=Current Direction=CPlaneZ )
Select surfaces, polysurfaces, SubDs and meshes to project onto ( Loose=No DeleteInput=No OutputLayer=Current Direction=CPlaneZ ): iplane
Select planar object to use as a temporary pseudo-infinite plane ( 3Point Vertical ThroughPoint AroundCurve NamedCPlane CPlaneXY CPlaneYZ CPlaneZX WorldXY WorldYZ WorldZX ): NamedCPlane
Name of CPlane to use as a temporary pseudo-infinite plane ( SelectInViewport SelectFromList ): SelectFromList

Select surfaces, polysurfaces, SubDs and meshes to project onto. Press Enter when done ( Loose=No DeleteInput=No OutputLayer=Current Direction=CPlaneZ )
Projecting… Press Esc to cancel

thanks @davidcockey
logged as RH-95683 Project with IPlane option fails to project complete objects