INTERSECTPLANES Return intersection line between 2 planes in space.

   LINE = intersectPlanes(PLANE1, PLANE2)
   Returns the straight line belonging to both planes.
   PLANE:  [x0 y0 z0  dx1 dy1 dz1  dx2 dy2 dz2]
   LINE:   [x0 y0 z0  dx dy dz]
   In case of parallel planes, returns line with NaN values.

   LINE = intersectPlanes(PLANE1, PLANE2, TOL)
   Also specifies the tolerance for detecting parallel planes.

   See also:
   planes3d, lines3d, intersectLinePlane

Package: matgeom