hdri

SIGGRAPH course 2016: An Artist-Friendly Workflow for Panoramic HDRI

SIGGRAPH课程2016：全景HDRI的艺术家友好型工作流程

Image-based lighting (IBL) with high dynamic range images (HDRI) is a well-known concept in the VFX and videogame industries, since Paul Debevec’s SIGGRAPH’97 paper that popularized the technique. Panoramic HDRI as a lighting source allows one to easily reproduce lighting from the real world and to better integrate a CG object inside an environment—a technique that’s widely used today.

自Paul Debevec的SIGGRAPH'97论文推广了这种技术以来，具有高动态范围图像(HDRI)的基于图像的照明(IBL)在VFX和视频游戏行业中是一个众所周知的概念。 全景HDRI作为光源，使人们可以轻松地重现现实世界中的照明，并更好地将CG对象集成到环境中-这是当今广泛使用的技术。

With the current interest in physically based rendering (PBR), there is a growing need for accurate HDRI creation to use them as a light source. An accurate HDRI:

由于目前对基于物理的渲染 (PBR)感兴趣，因此越来越需要精确的HDRI创建以将其用作光源。 准确的HDRI：

• captures the full range of lighting in the scene, without clipping

•捕获场景中的所有照明，而无需剪切

• has minimal lens artifacts

•镜头伪影最少

• is linear

•线性

• doesn’t include any artistic effects

•不包含任何艺术效果

In addition to the above requirements, we want to be able to recover the real-world intensity of an HDRI’s texels. Combined with physical light units, this allows us to use panoramic HDRIs and virtual lights together, with the correct lighting ratio. This ratio is usually eye-balled by artists. This document is oriented toward artists and describes an artist-friendly workflow for producing and using accurate HDRIs with the best practices we found when shooting our own HDRIs for Unity. For this workflow, we have avoided using complex devices or building a custom setup, so as many artists as possible will be able to reproduce our steps.

除了上述要求外，我们还希望能够恢复HDRI纹理像素的真实强度。 结合物理照明单元，这使我们能够以正确的照明比率一起使用全景HDRI和虚拟照明。 这个比例通常受到艺术家的关注。 本文档面向艺术家，并描述了艺术家友好的工作流程，以按照我们在为Unity拍摄自己的HDRI时发现的最佳实践来制作和使用准确的HDRI。 对于此工作流程，我们避免使用复杂的设备或构建自定义设置，因此，尽可能多的艺术家将能够重现我们的步骤。

The slides notes and source code are available here

幻灯片说明和源代码在此处

翻译自: https://blogs.unity3d.com/2016/08/28/59924/

hdri