| 摘要 |
PURPOSE:To provide a three-dimensional graphic display device which changes the display aspect of a single graphic without damaging other graphics in order to shorten the display processing time and improves the responsiveness and the conversational operability. CONSTITUTION:A three-dimensional graphic display device is provided with a graphic processor 13 which generates the image data based on the graphic data supplied from a CPU 11, a 1st frame memory FM1 15 and a 2nd frame memory FM2 16 where the generated image data are written, a Z buffer 14 which stores the position information on the depth direction of the graphic data, and a display 18 which puts the image data of both memories 15 and 16 on each other and shows the graphics. The CPU 11 draws a graphic to which the display aspect is changed into the memory 16 and then compares this graphic with the value of the depth direction of another graphic stored in the buffer 14 when the graphic data are changed. Then the graphic data are written when the new Z value is equal to and larger than the old Z value. |
