Reflective and Refractive Objects for Mixed Reality
Reflective and Refractive Objects for Mixed Reality
复制标题
混合现实的反射和折射物体
DOI：
10.1109/tvcg.2013.39
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
M. Wimmer
中科院分区：
文献类型：
--
作者：
Martin Knecht;C. Traxler;Christoph Winklhofer;M. Wimmer
在本文中，我们提出了一种新的渲染方法，将反射或折射的对象到一个差分即时辐射度（XRP）框架可用于混合现实（MR）应用程序。从光相互作用的角度来看，这类物体非常特殊，因为它们反射和吸收入射光线。因此，它们可能导致称为焦散的高频照明效果。使用即时辐射度（IR）方法来近似这些高频照明效果将需要大量的虚拟点光源（VPL），因此由于实时约束，这是不可取的。相反，我们的方法结合了差分即时辐射度与其他三种方法。一种方法通过使用视点替用特效来处理比简单立方体贴图更精确的反射。另一种方法能够实时计算两个折射，第三种方法使用小四边形来创建焦散效果。我们提出的方法取代部分光路中属于反射或折射物体使用这三种方法，从而紧密集成到光路。与以前将反射或折射对象引入MR场景的方法相比，我们的方法产生的焦散也会发出额外的间接光。该方法以实时帧速率运行，结果表明，具有焦散的反射和折射对象改善了MR场景的整体印象。
In this paper, we present a novel rendering method which integrates reflective or refractive objects into a differential instant radiosity (DIR) framework usable for mixed-reality (MR) applications. This kind of objects are very special from the light interaction point of view, as they reflect and refract incident rays. Therefore they may cause high-frequency lighting effects known as caustics. Using instant-radiosity (IR) methods to approximate these high-frequency lighting effects would require a large amount of virtual point lights (VPLs) and is therefore not desirable due to real-time constraints. Instead, our approach combines differential instant radiosity with three other methods. One method handles more accurate reflections compared to simple cubemaps by using impostors. Another method is able to calculate two refractions in real-time, and the third method uses small quads to create caustic effects. Our proposed method replaces parts in light paths that belong to reflective or refractive objects using these three methods and thus tightly integrates into DIR. In contrast to previous methods which introduce reflective or refractive objects into MR scenarios, our method produces caustics that also emit additional indirect light. The method runs at real-time frame rates, and the results show that reflective and refractive objects with caustics improve the overall impression for MR scenarios.