# How to change 4-Point Align to 1-Point Align

AlignPlus program allows user to change the quantity of alignment points without rerunning configuration wizard if it does not involve recalibration. This topic will introduce two examples of this type of changes: 4-camera based, and camera shuttling based.

## 4-Camera Based

In this application, one-part alignment used to use four cameras needs to be modified to only use one camera due to model change.

The places where user needs to handle for model change are camera acquisition, vision tool, and recipe. Follow these steps to change model:

1. Use "Save As" function to create a copy of current product recipe

2. Disable unused cameras

   Disable unused cameras in feature finder's exposure setting under Alignment/Camera and Lights/Exposure Settings.

3. Save current product recipe to save camera disable/enable information to Alignment recipe.

4. Modify vision task to find features of new model

   Open feature finder setup page after one image acquisition. Delete feature finders under unused cameras. Use one PatMax finder to locate one feature or two point finders (PatMax finder/Corner finder/Custom Point Finder) to locate two features on new model under the remaining camera.

5. Train golden pose for new model

6. Save current product recipe again to save golden pose and vision tools into Alignment recipe.

After this, the program is ready to run.

## Camera Shuttling Based

In model change of this application, one-part alignment used to use 2 shuttling cameras acquiring four images now needs to be changed to only use one camera acquiring one image at one position.

The steps to achieve this is the same as in the 4-camera based case except that:

- In 4-camera based application, the command to call feature finding task does not change before and after model change.

- In camera shuttling based application, the commands are different in quantity and parameter before and after model change.

  Before model change, two commands need to be sent to vision system to finish feature finding. One is for acquire only, the other is for acquire and process.

  Position | Action
  --- | ---
  Position 0 | Acquire Only
  Position 1 | Acquire and Process

  After model change, since position 1 does not need to acquire image anymore, only one command is needed for position 0: acquire and process, to run feature finder.

  Position | Action
  --- | ---
  Position 0 | Acquire and Process