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• Global_illumination abstract "Global illumination (shortened as GI) or indirect illumination is a general name for a group of algorithms used in 3D computer graphics that are meant to add more realistic lighting to 3D scenes. Such algorithms take into account not only the light which comes directly from a light source (direct illumination), but also subsequent cases in which light rays from the same source are reflected by other surfaces in the scene, whether reflective or not (indirect illumination).Theoretically reflections, refractions, and shadows are all examples of global illumination, because when simulating them, one object affects the rendering of another object (as opposed to an object being affected only by a direct light). In practice, however, only the simulation of diffuse inter-reflection or caustics is called global illumination.Images rendered using global illumination algorithms often appear more photorealistic than images rendered using only direct illumination algorithms. However, such images are computationally more expensive and consequently much slower to generate. One common approach is to compute the global illumination of a scene and store that information with the geometry, e.g., radiosity. That stored data can then be used to generate images from different viewpoints for generating walkthroughs of a scene without having to go through expensive lighting calculations repeatedly.Radiosity, ray tracing, beam tracing, cone tracing, path tracing, Metropolis light transport, ambient occlusion, photon mapping, and image based lighting are examples of algorithms used in global illumination, some of which may be used together to yield results that are not fast, but accurate.These algorithms model diffuse inter-reflection which is a very important part of global illumination; however most of these (excluding radiosity) also model specular reflection, which makes them more accurate algorithms to solve the lighting equation and provide a more realistically illuminated scene.The algorithms used to calculate the distribution of light energy between surfaces of a scene are closely related to heat transfer simulations performed using finite-element methods in engineering design.In real-time 3D graphics, the diffuse inter-reflection component of global illumination is sometimes approximated by an \"ambient\" term in the lighting equation, which is also called \"ambient lighting\" or \"ambient color\" in 3D software packages. Though this method of approximation (also known as a \"cheat\" because it's not really a global illumination method) is easy to perform computationally, when used alone it does not provide an adequately realistic effect. Ambient lighting is known to \"flatten\" shadows in 3D scenes, making the overall visual effect more bland. However, used properly, ambient lighting can be an efficient way to make up for a lack of processing power.".
• Global_illumination thumbnail Local_illumination.JPG?width=300.
• Global_illumination wikiPageExternalLink demos.
• Global_illumination wikiPageExternalLink introduction-global-illumination-path-tracing.
• Global_illumination wikiPageExternalLink MarcC_AoI-Global_Illumination.
• Global_illumination wikiPageExternalLink GI.
• Global_illumination wikiPageID "12629".
• Global_illumination wikiPageLength "9248".
• Global_illumination wikiPageOutDegree "46".
• Global_illumination wikiPageRevisionID "703170845".
• Global_illumination wikiPageWikiLink 3D_computer_graphics.
• Global_illumination wikiPageWikiLink Algorithm.
• Global_illumination wikiPageWikiLink Ambient_occlusion.
• Global_illumination wikiPageWikiLink Beam_tracing.
• Global_illumination wikiPageWikiLink Bias_of_an_estimator.
• Global_illumination wikiPageWikiLink Category:Global_illumination_algorithms.
• Global_illumination wikiPageWikiLink Category:Global_illumination_software.
• Global_illumination wikiPageWikiLink Caustic_(optics).
• Global_illumination wikiPageWikiLink Cone_tracing.
• Global_illumination wikiPageWikiLink Consistent_estimator.
• Global_illumination wikiPageWikiLink Diffuse_reflection.
• Global_illumination wikiPageWikiLink Distributed_ray_tracing.
• Global_illumination wikiPageWikiLink Finite_element_method.
• Global_illumination wikiPageWikiLink Heat_transfer.
• Global_illumination wikiPageWikiLink High-dynamic-range_imaging.
• Global_illumination wikiPageWikiLink Image-based_lighting.
• Global_illumination wikiPageWikiLink Lightcuts.
• Global_illumination wikiPageWikiLink Metropolis_light_transport.
• Global_illumination wikiPageWikiLink Path_tracing.
• Global_illumination wikiPageWikiLink Photon_mapping.
• Global_illumination wikiPageWikiLink Point_Based_Global_Illumination.
• Global_illumination wikiPageWikiLink Radiosity_(computer_graphics).
• Global_illumination wikiPageWikiLink Ray_tracing_(graphics).
• Global_illumination wikiPageWikiLink Real-time_rendering.
• Global_illumination wikiPageWikiLink Rendering_equation.
• Global_illumination wikiPageWikiLink Specular_reflection.
• Global_illumination wikiPageWikiLink Spherical_harmonic_lighting.
• Global_illumination wikiPageWikiLink Unbiased_rendering.
• Global_illumination wikiPageWikiLinkText "Global Illumination".
• Global_illumination wikiPageWikiLinkText "Global illumination".
• Global_illumination wikiPageWikiLinkText "Illumination".
• Global_illumination wikiPageWikiLinkText "Pre-Baked Global Illumination (GI)".
• Global_illumination wikiPageWikiLinkText "global illumination".
• Global_illumination wikiPageWikiLinkText "indirect illumination".
• Global_illumination wikiPageWikiLinkText "lighting system".
• Global_illumination wikiPageWikiLinkText "real-time global illumination".
• Global_illumination align "right".
• Global_illumination caption "Rendering with global illumination. Light is reflected by surfaces, and colored light transfers from one surface to another. Notice how color from the red wall and green wall reflects onto other surfaces in the scene. Also notable is the caustic projected onto the red wall from light passing through the glass sphere.".
• Global_illumination caption "Rendering without global illumination. Areas that lie outside of the ceiling lamp's direct light lack definition. For example, the lamp's housing appears completely uniform. Without the ambient light added into the render, it would appear uniformly black.".
• Global_illumination direction "vertical".
• Global_illumination image "Global illumination.JPG".
• Global_illumination image "Local illumination.JPG".
• Global_illumination width "300".
• Global_illumination wikiPageUsesTemplate Template:Multiple_image.
• Global_illumination wikiPageUsesTemplate Template:Portal.
• Global_illumination wikiPageUsesTemplate Template:Refimprove.
• Global_illumination wikiPageUsesTemplate Template:Reflist.
• Global_illumination subject Category:Global_illumination_algorithms.
• Global_illumination hypernym Name.
• Global_illumination type Algorithm.
• Global_illumination comment "Global illumination (shortened as GI) or indirect illumination is a general name for a group of algorithms used in 3D computer graphics that are meant to add more realistic lighting to 3D scenes.".
• Global_illumination label "Global illumination".
• Global_illumination sameAs Q1531701.
• Global_illumination sameAs الإضاءة_الشاملة.
• Global_illumination sameAs Globální_osvětlení.
• Global_illumination sameAs Globale_Beleuchtung.
• Global_illumination sameAs Iluminación_global.
• Global_illumination sameAs نورپردازی_سراسری.
• Global_illumination sameAs Illumination_globale.
• Global_illumination sameAs Globalno_osvjetljenje.
• Global_illumination sameAs Illuminazione_globale.
• Global_illumination sameAs グローバル・イルミネーション.
• Global_illumination sameAs Oświetlenie_globalne.
• Global_illumination sameAs m.039xc.
• Global_illumination sameAs Глобальное_освещение.
• Global_illumination sameAs Globalno_osvjetljenje.
• Global_illumination sameAs โกลบอลอินลูมิเนชัน.
• Global_illumination sameAs Sự_chiếu_sáng_tổng_thể.
• Global_illumination sameAs Q1531701.
• Global_illumination wasDerivedFrom Global_illumination?oldid=703170845.
• Global_illumination depiction Local_illumination.JPG.
• Global_illumination isPrimaryTopicOf Global_illumination.