| 摘要 |
PROBLEM TO BE SOLVED: To reduce calculation cost, when a moving three-dimensional object and a stationary three-dimensional object are displayed at the same time. SOLUTION: A three-dimensional plotting program sets an area for rasterization, in response to specification by the application of an area required for display of an animated three-dimensional object. In a first frame, although plot processing of all the three-dimensional objects notified by the application is performed, in the subsequent frames, coordinate conversion of three-dimensional model data and generation of plotting elements are performed, after clearing the frame buffer area to be rasterized, prior to rasterization processing; and then rasterization processing is performed only for the plotting elements within the area to be rasterized. Thereby, the need for insignificant replotting of the stationary three-dimensional object is eliminated, and the calculation cost is reduced, when the moving three-dimensional object and the static three-dimensional are displayed object at the same time. COPYRIGHT: (C)2004,JPO&NCIPI |
