To define a planes, the user is currently expected to:
- click on "Compute around bounding box"
- select the model for projection
- create a "connected landmark list"
- click "add a new plane"
- manually place 3 fiducials and make sure the correct fiducials are associated with the plane

To streamline this process and rely on the new plane markups, here are few questions:
- what is the role of the "Define middle point between two landmarks" ? Is this is still needed ?
- the save/load plane is an undocumented format specific to this extension. Are these files used ? Can we now use the new "json" format used to save markup annotation in Slicer ? (it is versioned and has a schema)
The plane markup is also associated with 3 fiducials and provide a mechanism to easily adjust angle/origin of the plane by showing an interactive tool:

By using the plane annotation, we would remove a lot of code in the extension and would simply display a list of plane markup annotations.
cc: @msyatabe
To define a planes, the user is currently expected to:
To streamline this process and rely on the new plane markups, here are few questions:
The plane markup is also associated with 3 fiducials and provide a mechanism to easily adjust angle/origin of the plane by showing an interactive tool:
By using the plane annotation, we would remove a lot of code in the extension and would simply display a list of plane markup annotations.
cc: @msyatabe