| 摘要 |
PROBLEM TO BE SOLVED: To restore a correct stereoscopic shape by inputting the twodimensional shape of the stereoscopic shape which is projected on a projecting surface as a two-dimensional free curved line, calculating a three-dimensional NURB curved line being a rational curved line and restoring the stereoscopic shape. SOLUTION: A command analyzing/processing part 201 is connected to a display device 206 and a sketch input means 209 with input/output mechanism 205 so as to analyze and process an inputted command. Input/output mechanism 205 consists of a part constructed by the command analyzing/processing part 201, a geometry processing part 202, a storage processing part 204 and a graphic information storage area 204 and the interface of the display device 206 and the sketch input means 209. One or plural projecting surfaces are decided and the two-dimensional free curved line constituting the two-dimensional shape at the time of projecting the stereoscopic shape on the projecting surface is inputted by hand-writing, etc. The three-dimentional NURB curved line with no limit in a plotted curved line and without much influence in slight change is calculated based on the two-dimensional free curved line and the stereoscopic shape is restored based on the three-dimensional NURB curved line. |
