ISPOINTINMESH Check if a point is inside a 3D mesh.

   B = isPointInMesh(PT, V, F)
   Check if the point PT (given as a 1-by-3 array) is inside the mesh
   defined by the vertices V and the face array F. The result is a
   boolean.

   If PT is a N-by-3 point array, the result is a N-by-1 array of logical.

   Example
     [v, f] = torusMesh([50 50 50 30 10 30 45]);
     [x, y, z] = meshgrid(5:5:100, 5:5:100, 5:5:100);
     res = false(size(x));
     res(:) = isPointInMesh([x(:) y(:) z(:)], v, f);
     figure; plot3(x(res), y(res), z(res), 'b.'); axis equal;

   Algorithm:
   The method computes the intersection with a ray starting from the
   point(s) and with a random orientation. Some errors are possible if
   rays crosses the mesh between two or three faces.

   See also
     meshes3d, intersectLineMesh3d

Package: matgeom