the normal vector based on 3 vectors?

my skills are not very high at the moment but i think it is very simple....

I want to render a plane, that is clipped by a box.

The 3 vectors are:

v1=<12,15,73>
v2=<28,  4,68>
v3=<20,10,70>



#declare mui_plane=union{
                                         plane { < ?, ?, ?>, 0
                                         pigment { color rgb <0.7,0.0,0.0> }
                                        }
                                        }

 object {
    mui_plane
    clipped_by{box{<-1,-1,-1>,<1,1,1>}}
  }

Is there an easier way or how can I do this?

Help is very apprechiated.

Thanks in advance,

Robert

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