Computer graphics(CG) is one of the most useful tools by which we can easily understand visible/invisible natural phenomena. Namely, phenomena in the universe is attractive one because of its beauty and invisibility on the earth. Kishi proposed a visual simulation method for gravitational lensing. However, this method is restricted by the position of all gravitational sources. In this paper an improved visualization method is proposed, which can represent more complex situation than the previous method.
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