| 摘要 |
<p>PURPOSE:To carry out a similar processing to an enciphering formation model by applying a normal vector producing method to a freely curved surface by CSG. CONSTITUTION:As a formation data 20 by a CGS, the function information of a surface showing a boundary, and a freely curved surface data 23 does not include a boundary data. The freely curved surface data 23 is processed together with space information from a processing 44 corresponding to an application in a formation extract processing section 40, and further stored in a formation information stack area 46 together with an information of an enciphering formation processing 41. In such a stack area 46, all primitive information stored and the stored primitives are subjected to a set operation 42 based on an object structure data 21 and outputted as entire formation information TS.</p> |
