Ellipse becomes skewed in custom vertical Baseplane

Grasshopper
1

What’s the deal with the crappy Ellipse in this case ?
Since the input plane is perfectly vertical, it shouldn’t be skewed like that.

240507_IMG_Crappy Ellipse
240507_IMG_Crappy Ellipse1294×900 138 KB

240507_PROG_Crappy Ellipse.gh (11.0 KB)

2

@osuire
This solves it, though I do not know why.

kuva
kuva1698×554 80.4 KB

EDIT: Just a random thought… When the plane is fed to the Bbox, the object itself is identified as an ellipse, which has a precalculated bounding box. Then the plane is not fed, the object is identified as a “random” curve, and the Bbox is an approximation based on the tolerance…

3

Well, the issue is that the ellipse is REALLY skewed.
Then maybe the problem is with the plane, but it’s just a XZ plane with a custom origin.