A Quick Rendering Method Using Basis Functions for Interactive Lighting Design
A Quick Rendering Method Using Basis Functions for Interactive Lighting Design
复制标题
一种利用基函数进行交互式照明设计的快速渲染方法
DOI：
10.1111/j.1467-8659.1995.cgf143_0229.x
复制
发表时间：
1995
影响因子：
2.5
通讯作者：
H. Yamashita
中科院分区：
文献类型：
--
作者：
Y. Dobashi;K. Kaneda;Hideki Nakatani;H. Yamashita
在设计室内照明效果时，需要比较涉及不同照明设备和光方向的各种照明设计。然而，考虑到相互反射，生成具有许多不同照明参数的图像是耗时的，因为必须计算和重新计算所有亮度。这使得以交互方式设计照明效果变得困难。为了解决这一问题，提出了一种快速生成特定场景的图像的方法，该图像描述了由具有任意光强分布的光源照明的交互反射环境。在该方法中，光强分布用基函数来表示。该方法以一系列球谐函数为基函数，预先计算出光强分布与球谐函数相同的光源照射表面上的各个光强。这种方法使得快速生成图像成为可能，以至于我们可以交互地改变发光强度分布。将提出的方法与采用强度映射的交互式漫游相结合，实现了一个用于照明设计的交互式系统。该方法在交互式照明设计中的应用证明了该方法的有效性，在交互式照明设计中，许多图像是通过改变照明设备和/或光线方向来生成的。
When designing interior lighting effects, it is desirable to compare a variety of lighting designs involving different lighting devices and directions of light. It is, however, time‐consuming to generate images with many different lighting parameters, taking interreflection into account, because all luminances must be calculated and recalculated. This makes it difficult to design lighting effects interactively. To address this problem, this paper proposes a method of quickly generating images of a given scene illustrating an interreflective environment illuminated by sources with arbitrary luminous intensity distributions. In the proposed method, the luminous intensity ditribution is expressed with basis functions. The proposed method uses a series of spherical harmonic functions as basis functions, and calculates in advance each intensity on surfaces lit by the light sources whose luminous intensity distribution are the same as the spherical harmonic functions. The proposed method makes it possible to generate images so quickly that we can change the luminous intensity distribution interactively. Combining the proposed method with an interactive walk‐through that employs intensity mapping, an interactive system for lighting design is implemented. The usefulness of the proposed method is demonstrated by its application to interactive lighting design, where many images are generated by altering lighting devices and/or direction of light.