Cylinder Aabb surface Area and Height seems off

Unity Engine
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1

I created a Cylinder Collider using the CylinderGeometry from PhysicsShapeAuthoring with:
height = 0.5
radius = 0.25
orientation (90,0,0)
so the cylinder is sitting upright.

6370644--709128--upload_2020-10-1_9-38-47.png
6370644--709128--upload_2020-10-1_9-38-47.png1906×1073 268 KB

I calculate the surface are using the radius and height and got 1.7units instead of 2.5units. (In terms of my values) I also noticed that the extents.y of the Aabb is double the height but since the height is technically the extents on the y axis, so shouldn’t the extents.y just be the height?

tmp, in the debug output view, is the default Cylinder.sharemesh bounds.
mesh, in the debug output view, is the modified mesh used to replicate the PhysicsShapeAuthoring gizmo mesh

Also in order for the final mesh gizmo to match the PhysicsShapeAuthoring gizmo i have to further reduce the height. are the units in the PhysicsShapeArthoring different from the default GameObject units?

2

This is the default behaviour for rotated AABB. Because AABB doesn’t know anything about your mesh. It could be cube. And for cube it is valid values.

3

thank you.