#### 10.9.12 getplanEqn

• getplanEqn( <[a,b,c,d]> [, scale] )
• Description: that macro returns a facet correponding to the plane <[a,b,c,d]> clipped by the current 3D window. The plane is defined in the form of a cartesian equation $ax+by+cz=d$. The optional parameter <scale>, is $1$ by default, is used to scale up or down the size of that facet.