BUG: _CPlane _Object does not work on oriented clipping planes

Rhino
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1

Using _CPlane _Object on an oriented clipping plane leads to a Cplane that is no parallel to the oriented clipping plane, only centered on it, which is useless.

Steps to reproduce:

  1. open oriented clipping plane.3dm (33.7 KB)
    image
    image1019×902 21.4 KB
  2. Use _CPlane _Object on it.
  3. Result is unexpected:
    image
    image754×721 13.8 KB

Result should be a Cplane aligned with the clipping plane:

image
image946×952 20.2 KB

In case this was considered but dismissed, the use case is to use a clipping plane to check inside parts during design reviews, and then using dimensions to measure thicknesses along the clipping plane. The current workaround is to orient a flat surface and a clipping plane at the same time, and to use _CPlane _Object on the flat surface, then hide the surface.

Rhino 8 SR19 2025-5-12 (Rhino 8, 8.19.25132.01001, Git hash:master @ 57e3eb280b0f32cbe59f53a554be5e8ffa66fc36)
License type: Commercial, build 2025-05-12
License details: Cloud Zoo

Windows 11 (10.0.26100 SR0.0) or greater (Physical RAM: 32GB)
.NET 7.0.0

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