In DBPro, I used the "pick screen" command, that way I could obtain the absolute 3d coordinates using only the mouse coordinates.
You could also use pick object, it will give you the relative coordinates of the object.
PICK SCREEN
This command will calculate a relative 3D coordinate from a 2D screen coordinate. The additional Distance parameter indicates how far into the screen the 3D coordinate is to be calculated. The resulting 3D coordinate is not a world position, but a relative 3D vector from the current camera position. The world coordinate can be obtained by adding the camera position to the resulting vector. The resulting vector is generated internally and can be retrieved using the GET PICK VECTOR commands.
PICK OBJECT
This command will return the Object Number of the closest object at the specified screen coordinates. The objects that are tested against the 2D coordinate are only those within the Object Start and Object End range in order to speed up specific tests. If no object exists at the coordinate, a value of zero is returned. If an object number is returned, additional data will be generated and stored internally. This extra data can be retrieved using the GET PICK VECTOR and GET PICK DISTANCE commands. Be aware that there may be multiple cameras when picking objects. To make sure you are selecting the correct screen object, use the SET CURRENT CAMERA command for the screen being rendered by that camera view. Do not use extreme camera range or object distances with this command, as this increases the inaccuracy of the raycast line being used internally. You can specify an optional parameter to ignore the camera orientation, which is usefulfor selecting objects that also ignore the influences of the camera.
