Hi all I need some help making some shapes,
I'm trying to kane an octahedron without taking a box and cutting off 
edges, as I later want to make a regular dodecahedron and an icosahedron.
I finally found the prisim and it makes good stuff for other things but 
i'm still new and cant find how to make the shapes above thanks for the 
help!

this is what I have to do ?  but remember i'm new!

#declare cutter =
box {
<2.1,2.1,2.1>
<-2.1,-2.1,-2.1>
pigment {Green}
translate  <0,3.5,0>
}

difference {

box {
<2,2,2>
<-2,-2,-2>
pigment {Green}
}
object {cutter  rotate x*45}
object {cutter  rotate x*-45}
object {cutter  rotate x*45 scale -1}
object {cutter  rotate x*-45 scale -1}


object {cutter  rotate z*45}
object {cutter  rotate z*-45}
object {cutter  rotate z*45 scale -1}
object {cutter  rotate z*-45 scale -1}
}

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