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HDRI Rendering This tutorial focuses on rendering a photo realistic scene. To do so, we use the radiosity tag and the HDRI tag. With help of these two tags it is possible to use an technique called Image Based Lighting, or IBL. When you render a scene with IBL, the scene won't be light by normal light sources such as a point light, but rather by a special background texture. These High Dynamic Range Images store light levels beyond what a normal texture map can, and so are suitable for simulating realistic environments, such as a very bright sun shining in the sky. These textures end with ".hdr". Normal textures like .jpg don't work because they don't contain the proper lighting information. The quality of a HDRI rendering is highly dependent on the quality of the HDRI texture. A excellent source for affordable high end HDRI textures is www.realtexture.com . Cheetah3D comes with two small sample HDRI textures from www.realtextures.com . You can find them in the examples folder.As you can see below, two different .hdr textures can create two totally different lighting environments.
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