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Words related to interreflection

reciprocal reflection between two reflecting surfaces

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Klems showed that with a few simplifying assumptions, it is possible to derive the overall system transmittance matrix of a set of layers, including all the effects of multiple interreflections between layers, from the optical properties of individual layers [Klems 1994a, 1994b].
While the calculation of luminance distributions for CFS characterized with BSDF data is fairly efficient using mkillum, it still takes some time to sample the exterior environment, account for interreflections and so on, then considerably longer to render a final image using the computed secondary light sources.
In order to assess the contribution of light from points in the scene to light reaching the observer, many values of the BRDF of the surface containing the contributing point must be used, particularly when light coming from diffuse interreflections is computed.
In 1984 Cindy Goral presented the first radiosity paper in computer graphics, and we were thrilled that we could model this simple box and capture the "colorbleeding" phenomena caused by the interreflections of light (Figure 6).
It is made of diffusely reflecting surfaces with backlighting and deals with the interplay and interreflections of light bouncing off the back colored surfaces (Figure 8).
Overall, Case 4, which tracks the sun patches and treats the diffuse radiation part using the absorptance-weighted area method, and Case 5, which tracks the sun patches and uses the simplified radiosity method to calculate interreflections, are both in good agreement with the advanced computational method (described as Case 6), which tracks the sun patches using ray-tracing and uses fine-grid radiosity for processing the detailed diffuse flux.
We assume then that these lighting calculations, and in particular interreflections between colored surfaces, can be accurately calculated using three separate color bands.
These surfaces were located at the ceiling level, discretized into small areas, and account for the exterior luminance distribution due to the sky and the roof geometry and interreflections within the monitors or skylight wells.
An HDR image captures the amount of light reflected from all of the neighboring structures towards the camera; therefore, it eliminates the need to digitally model the geometry, physically based material properties of the surrounding, and to compute the interreflections between these outside surfaces.