t S y s t e m Engineering Dept. Design Div. " t ' t D e v e l o p m e n t Dept. No. 1 I n f o r m a t i o n Systems Div. No. 1 T o y o t a M o t o r C o r p o r a t i o n 1, T o y o t a -c h o , Toyota, 471 J a p a n Tel 0565(28)2121actual car resulting Image ABSTRACTWe have developed a rendering technique to generate realistic images meeting designers' requirements by strictly analyzing various physical phenomena relevant to the appearance of actual objects.We have numerically compared the results of the calculations using this technique with colorimetry values. As a result, both values were virtually equal, so we have been able to confirm the effectiveness of the established technique.Application of this technique to car design, which has not been realized to a large extent because of severe requests for realism, will make it possible to evaluate styles and colors on a graphics display before making a clay model.

We have developed a color CAD system which enables a color designer to evaluate and create body colors of a car on a graphic display and put this system into practical use. The system has three features; generating realistic images comparable to photography to satisfy the car designer's needs, through close analysis of the physical phenomena taking place in the real environment, reproducing the desired colors very accurately on a CRT monitor, through analysis of the CRT colorimetric characteristics of reproducing the specified colors in response to the input signals, and utilizing a parallel computer to generate realistic images at a high speed and to control colors through interactive operation. Application of the CAD system reported here to the field of color design made it possible to fully evaluate and create body colors by means of computer graphics, replacing the conventional method which requires the painting of clay models or prototype cars.

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