A multi model registration (MMR) process performed using a computer, for registering a plurality of workpiece vision models representing features on a workpiece that define a marking location thereon, to corresponding part vision models stored on the computer representing features that define a desired part marking location. By this process, respectively corresponding workpiece vision models and part vision models are aligned for guiding a laser to mark the workpiece, the position and orientation of the workpiece being variable relative to that represented by the stored part vision model. The MMR process includes capturing a new image of the workpiece that includes one of the plurality of features on the workpiece that define its marking location; generating a workpiece vision model of that one workpiece feature included in the new workpiece image captured; registering the new workpiece vision model generated to the stored part vision model representing the corresponding one of the features defining the part marking location; and repeating these process steps for each of the remaining workpiece features defining the marking location thereon, for which there is respective corresponding stored part vision model representing a feature defining the part marking location. The inventive multi model registration process further includes a step of extracting a mathematical transformation (for instance a matrix) which includes respective position and orientation relative to each respective pair of corresponding workpiece and part vision models.