| 摘要 |
PURPOSE:To put a crossing decision part and a brightness calculation part in parallel operation and to shorten an image generation time by providing a brightness accumulation part which obtains brightness of each picture element from a brightness calculation part and a picture element memory and integrates it, and writes the result in the picture element memory again. CONSTITUTION:The brightness calculation part 13 calculates the brightness at an intersection from body; data on the color, reflection coefficient, transmission coefficient, etc., of a body. When reflection and transmission processing is not required, a picture element number and the calculated brightness are outputted to the brightness accumulation part 14 and when the reflection and transmission processing is required, the intersection with the body is set as a view point to recalculate light beam, which is outputted to a light beam data buffer 11. The brightness accumulation part 14 adds the brightness inputted from the brightness calculation part 13 to the brightness of the same picture element stored in the picture element memory 15 and writes the result in the picture element memory 15. An image generation control part 16 controls the light beam data buffer 11 and outputs the light beam data to the intersection decision part so that the intersection decision part 12 operates effectively. Consequently, the intersection decision part 11 process the input from the light beam buffer 11 in parallel.
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