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[sega <dorofeenko@xxxxxxxxx>]

>    <interactingGeometry _className_="InteractingFacet"  diffuseColor="{1
> 1 1}" vertices="[{1 0 0} {0 1 0} {-1 0 0} {0 -1 0}]" />
> 
> The intent was to have unit square slab in the xy plane; its
> se3.position is in the origin. However, in the rendering, I get facet
> with 5 edges!
> 

se3.position is the vertex too. it is the facet origin {0,0,0}.
set vertices="[{2 0 0} {2 2 0} {0 2 0}]" and se3.position = {-1 -1 0}

> I find edges useful only if there is falling onto a convex object
> between two facets, such that in the direction of both facets, there
> will be no projection of the sphere on the respective facet; the sphere
> would fall through then, right?

Yes.

-- 
Best regards, Sergei D.
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