Method and apparatus for rendering a solid three dimensional model from two dimensional input information including closed region recognizing and three dimensional rendering

A solid model generating system comprising:

• drawing classifying means for classifying input two-dimensional drawing data either as plan view data or sectional view data;
• closed region recognizing means for automatically detecting and identifying closed regions and information regarding the positional relationships received from the classified plan view data, detecting attributes of the detected closed regions, and grouping the detected closed regions based on the detected attributes of the closed regions;
• closed region three-dimensionalizing means for dividing the classified sectional view data based on the detected closed region data, three-dimensionalizing selected portions of the closed regions based on the divided sectional view data, and three-dimensionalizing closed regions not belonging to a three-dimensionalized portion of the closed regions but belonging to the same group as a three-dimensionalized closed region in a like manner as performed on the selected portions of the three dimensionsalized closed region;
• and
• solid model generating means for generating a solid model by combining the three-dimensionalized closed regions based on the detected positional information on the relationship among the respective closed regions.