Virtual spectrophotometric measurements for biologically and physically based rendering

被引：34

作者：

Baranoski G.V.G. ^{[1
]}

Rokne J.G. ^{[2
]}

Xu G. ^{[3
]}

机构：

[1] Department of Computer Science, University of Waterloo

[2] Department of Computer Science, The University of Calgary

[3] Diversinet Corporation, Toronto

来源：

The Visual Computer | 2001年 / 17卷 / 8期

关键词：

Ray density; Rendering; Spectral measurements;

D O I：

10.1007/s003710100127

中图分类号：

学科分类号：

摘要：

Virtual spectrophotometric measurements have important applications in biologically and physically based rendering. These measurements are used to evaluate reflectance and transmittance models through comparisons with actual spectrophotometric measurements. Moreover, they are also used to generate spectrophotometric data, which are dependent either on the wavelength or on the illuminating geometry of the incident radiation, from previously validated models. In this paper the ray casting based formulation for virtual spectrophotometers is discussed, and an original ray density analysis is presented, which increases the efficiency of these virtual devices. Specifically, a mathematical bound based on probability theory is proposed to determine the number of rays needed to obtain asymptotically convergent readings in the shortest possible computation time. Practical experiments are provided which illustrate the validity and usefulness of the proposed approach.

引用

页码：506 / 518

页数：12

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