hello,

currently I render a scene with an isosurface and a mirror showing that isosurface.
isosurface is created like:
difference{
	object { isosurface1_containedby_box }
	object { 
		isosurface2_containedby_box 
		translate y*-value
	}
	rotate x*90
}
the result is a nearly planar surface.
the mirror has reflection 0.8.

but now backside of isosurface is invisible in mirror.
I heared about keyword <<hollow>>. 
does it come in play here? if yes, where do I have to place it? what else can I do?

thanks in advance

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