[solved] rotating enitity toward target point

[tbd]

can anyone help me in implementing a rotation around group center to face toward a target point ?

EDIT:
here is the solution code:

def create_geometry(obj_origin)
  light = Sketchup.active_model.entities.add_group 
  light.entities.add_circle(ORIGIN,Z_AXIS,10.cm,3)
  light.entities.add_line(ORIGIN,ORIGIN.offset(Z_AXIS,10.cm))
  
  t1 = Geom;;Transformation.translation(obj_origin - ORIGIN)
  Sketchup.active_model.entities.transform_entities(t1, light)

  # return light group
  light
end

def rotate_geometry(grp, target)
  # quick access variables
  o = grp.bounds.center
  td = o - target
  axr = Z_AXIS * td
  anr = Z_AXIS.angle_between(td)

  # face the group toward this point
  Sketchup.active_model.entities.add_cpoint(target)
    
  t1 = Geom;;Transformation.rotation(o, axr, anr)
  grp.transform!(t1)  
end

grp = create_geometry(Geom;;Point3d.new(10,10,10))
rotate_geometry(grp,Geom;;Point3d.new(20,20,20))

[Jim]

To get the axis of rotation, take the cross product between the current direction (Vector) and the target direction(Vector).

To get the angle of rotation, use the API method angle_between for the current and target vectors.

Create a new rotation transformation and apply it.

[tbd]

thanks Jim. just before your response I solved it in another way, using the axes of the target direction and creating a transformation array.

wish I had asked this question 3 days ago