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indirect illumination |
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Battlefield illumination provided by employing searchlight or pyrotechnic illuminants using diffusion or reflection. a. Illumination by diffusion: Illumination of an area beneath and to the flanks of a slightly elevated searchlight or of pyrotechnic illuminants, by the light scattered from atmospheric particles. b. Illumination by reflection: Illumination of an area by reflecting light from low cloud. Either or both of these effects are present when a searchlight is used in defilade or with its beam spread to maximum width. |
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| Figure 7 (top) which uses the built-in BRDF shader, shows the direct reflection of the six light sources correctly, but there is no reflection at all of the indirect illumination from the surrounding checkered floor. Realistic lighting is largely determined by indirect illumination effects such as the occlusion of elements in a scene from simulated direct light and the indirect illumination caused by light scattered from various directly or indirectly lit surfaces in the 3D environment. The quality of indirect illumination and ambient occlusion has been improved, especially for animation. |
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indirect illumination
