Real-Time Global Illumination Using Shadow Radiance

使用阴影辐射的实时全局照明

• 批准号: EP/E047343/1
• 负责人: Jan Kautz
• 金额: $ 25.92万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FE047343%2F1
• 关键词: Real; Time; Global; Illumination; Using

A core unsolved problem in computer graphics is how to compute a global illumination solution for dynamic scenes at real-time frame rates. Global illumination is used to add realistic lighting to scenes by taking into account not only light that comes directly from the light source but also indirectly through reflection by other surfaces. In this proposal, we consider new techniques that aim at computing global illumination in real-time. Many applications, such as training, virtual reality, or entertainment, require the ability to interact with a virtual scene. For instance, a user may wish to move furniture around in an architectural application setting. This necessitates updating the resulting illumination in real-time according to the changes in the scene. However, current techniques for real-time illumination computation are either limited to static scenes or to very simple lighting models, such as point lights with hard shadows and no indirect illumination, which decrease the resulting image quality and realism. This is undesirable and a real-time method for general global illumination is still outstanding. The core reason why present global illumination techniques cannot handle dynamic scenes is the need for costly visibility queries between scene elements. In this project, we will develop a new approach to computing global illumination solutions in real-time, without the need for costly visibility queries. In fact, visibility will be handled implicitly by the algorithm through the use of shadow radiance. We will demonstrate the efficiency of our technique using a game and a design application setting. In both scenarios the illumination will always be updated in real-time according to user interactions (e.g., moving furniture around), which has not been previously possible.

计算机图形学中一个未解决的核心问题是如何计算实时帧速率下动态场景的全局照明解决方案。全局照明用于为场景添加真实的照明，不仅考虑直接来自光源的光，还考虑通过其他表面反射间接产生的光。在这个提案中，我们考虑了旨在实时计算全局照明的新技术。许多应用程序，例如培训、虚拟现实或娱乐，都需要与虚拟场景交互的能力。例如，用户可能希望在建筑应用程序设置中移动家具。这就需要根据场景的变化实时更新最终的照明。然而，当前的实时照明计算技术要么仅限于静态场景，要么仅限于非常简单的照明模型，例如具有硬阴影且无间接照明的点光源，这会降低最终的图像质量和真实感。这是不希望的，并且用于一般全局照明的实时方法仍然很出色。目前的全局照明技术无法处理动态场景的核心原因是需要在场景元素之间进行昂贵的可见性查询。在这个项目中，我们将开发一种实时计算全局照明解决方案的新方法，而不需要昂贵的可见性查询。事实上，算法将通过使用阴影辐射率来隐式处理可见性。我们将使用游戏和设计应用程序设置来演示我们技术的效率。在这两种情况下，照明将始终根据用户交互（例如，移动家具）实时更新，这在以前是不可能的。

项目成果

Perceptual influence of approximate visibility in indirect illumination

间接照明中近似可见度的感知影响

• DOI: 10.1145/1609967.1609971
• 发表时间: 2009
• 期刊: ACM Transactions on Applied Perception
• 影响因子: 1.6
• 作者: Yu I

Micro-rendering for scalable, parallel final gathering

用于可扩展、并行最终聚集的微渲染

• DOI: 10.1145/1618452.1618478
• 发表时间: 2009
• 期刊: ACM Transactions on Graphics
• 影响因子: 6.2
• 作者: Ritschel T

Imperfect shadow maps for efficient computation of indirect illumination

用于高效计算间接照明的不完美阴影贴图

• DOI: 10.1145/1409060.1409082
• 发表时间: 2008
• 期刊: ACM Transactions on Graphics
• 影响因子: 6.2
• 作者: Ritschel T