| 摘要 |
In a process where an object fades-in/fades-out, a rate of transparency change is set. A writing threshold is obtained according to the rate of change of the transparency of the object. Polygons included in the object are sequentially processed, and an alpha value of the processed polygon is obtained according to the rate of change of the transparency. When a Z value of the polygon is smaller than that registered in a Z-buffer, the polygon is drawn in a frame buffer. The Z value of the polygon is written to the Z-buffer only when the current alpha value is larger than the threshold. When a Z value of the polygon is larger than that registered in the Z-buffer, the polygon is not drawn in the frame buffer.
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