Understanding the value range in the HDRI used as the source for IBL.Establishing an appropriate, color managed, linear workflow.IBL can be also used as a complement to the more standard techniques that try to model illumination using classic CG lights, blockers and bouncers.įor a proper IBL workflow, three aspects are key to achieve eye-pleasing imagery: It is good for both exteriors and interiors lighting (often in combination with area lights and portals). It provides fast, easy to setup, highly detailed lighting, shadowing, reflections and refractions. IBL is the de-facto standard lighting technique in global illumination and physically-based renderers. Accounting for both the materials' scattering response (BSDF) and the lighting information encoded into the image, multiple importance sampling (MIS) is used to resolve both indirect diffuse and indirect specular effects. Path tracing is then used to resolve all the visibility and light paths that illuminate the objects in the 3D scene from the HDRI. Typically, the image is captured and processed as a high dynamic range image (HDRI) for greater realism. This image is then projected onto a dome or sphere analogously to environment mapping. Image-Based Lighting (IBL) is a CG rendering technique used in many workflows which involves using an omni-directional representation of light information encoded as an image.
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