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. 1992 Dec;10(4):218-21, 227-8.
doi: 10.1016/0263-7855(92)80071-k.

Photorealistic image generation of molecular structure on PC screen using the ray-tracing technique

S Kim  1 , C W Yoon, B J Mhin, H S Kim, K S Kim
Affiliations

Photorealistic image generation of molecular structure on PC screen using the ray-tracing technique

S Kim et al. J Mol Graph. 1992 Dec.

Abstract

A PC version of three-dimensional molecular graphics package has been developed to run under MS-DOS environment on IBM PC-compatible computers equipped with a VGA graphics board. The program consists of two parts: a menu-driven interactive system module in EGA mode, and a ray-tracing module in VGA mode. In the 256-color VGA mode, ray-tracing images are represented with a 4-color map, with 64 levels for each color: 32 levels of illuminance and 32 levels of saturation. Molecular structure can be analyzed along various directions with various light sources. Ray-tracing images are also represented in a 16-color EGA mode with the half-toning method, which can display 76 gray levels for each color. To obtain good photo-realistic images in an efficient way, we have used two light sources, with an intensity ratio of 7:3, which are located in front of the top right and bottom left corners of the screen.

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