PLANEPOSITION Compute position of a point on a plane.

   PT2 = planePosition(POINT, PLANE)
   POINT has format [X Y Z], and plane has format
   [X0 Y0 Z0  DX1 DY1 DZ1  DX2 DY2 DZ2], where :
   - (X0, Y0, Z0) is a point belonging to the plane
   - (DX1, DY1, DZ1) is a first direction vector
   - (DX2, DY2, DZ2) is a second direction vector

   Result PT2 has the form [XP YP], with [XP YP] coordinate of the point
   in the coordinate system of the plane.

   
   CAUTION:
   WORKS ONLY FOR PLANES WITH ORTHOGONAL DIRECTION VECTORS

   Example
     plane = [10 20 30  1 0 0  0 1 0];
     point = [13 24 35];
     pos = planePosition(point, plane)
     pos = 
         3   4

   See also:
   geom3d, planes3d, points3d, planePoint

Package: matgeom