Three-dimensional computer graphics (3DCG) is the technique of creating an image having a stereoscopic effect by converting an object in the virtual three-dimensional space into two-dimensional information. It is also possible to produce an image that cannot be distinguished from the real thing by using the 3DCG. 3DCG is expected for the application to visual representations very much. However, it is difficult to express the "freshness" of fresh food by 3DCG.Therefore, expressiveness of 3DCG is considered to be improved by overcoming this weakness. The algorithm is implemented by using the Visual C++ 2010 and C on a personal computer. Through this trial, we hope to improve the representation in photo-realistic rendering by 3DCG.