1. A method for generating a non-imaged plane view of an anatomical part in computer-assisted surgery, the method comprising: providing a model of the anatomical part comprising features and dimension parameters related to said features; obtaining at least a first plane view of the anatomical part; identifying said features in said at least first plane view; measuring values of said dimension parameters from said features identified in said at least first plane view; displaying, in said non-imaged plane view, said model dimensioned with said dimension parameters adjusted to said values; tracking a position and orientation of a surgical object relative to said anatomical part while a user manipulates said surgical object in space; and generating a representation of said surgical object to be overlaid in register on said non-imaged view, using the tracked position and orientation.