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- Reflection_mapping abstract "In computer graphics, environment mapping, or reflection mapping, is an efficient image-based lighting technique for approximating the appearance of a reflective surface by means of a precomputed texture image. The texture is used to store the image of the distant environment surrounding the rendered object.Several ways of storing the surrounding environment are employed. The first technique was sphere mapping, in which a single texture contains the image of the surroundings as reflected on a mirror ball. It has been almost entirely surpassed by cube mapping, in which the environment is projected onto the six faces of a cube and stored as six square textures or unfolded into six square regions of a single texture. Other projections that have some superior mathematical or computational properties include the paraboloid mapping, the pyramid mapping, the octahedron mapping, and the HEALPix mapping.The reflection mapping approach is more efficient than the classical ray tracing approach of computing the exact reflection by tracing a ray and following its optical path. The reflection color used in the shading computation at a pixel is determined by calculating the reflection vector at the point on the object and mapping it to the texel in the environment map. This technique often produces results that are superficially similar to those generated by raytracing, but is less computationally expensive since the radiance value of the reflection comes from calculating the angles of incidence and reflection, followed by a texture lookup, rather than followed by tracing a ray against the scene geometry and computing the radiance of the ray, simplifying the GPU workload.However in most circumstances a mapped reflection is only an approximation of the real reflection. Environment mapping relies on two assumptions that are seldom satisfied:1) All radiance incident upon the object being shaded comes from an infinite distance. When this is not the case the reflection of nearby geometry appears in the wrong place on the reflected object. When this is the case, no parallax is seen in the reflection.2) The object being shaded is convex, such that it contains no self-interreflections. When this is not the case the object does not appear in the reflection; only the environment does.Reflection mapping is also a traditional image-based lighting technique for creating reflections of real-world backgrounds on synthetic objects.Environment mapping is generally the fastest method of rendering a reflective surface. To further increase the speed of rendering, the renderer may calculate the position of the reflected ray at each vertex. Then, the position is interpolated across polygons to which the vertex is attached. This eliminates the need for recalculating every pixel's reflection direction.If normal mapping is used, each polygon has many face normals (the direction a given point on a polygon is facing), which can be used in tandem with an environment map to produce a more realistic reflection. In this case, the angle of reflection at a given point on a polygon will take the normal map into consideration. This technique is used to make an otherwise flat surface appear textured, for example corrugated metal, or brushed aluminium.".
- Reflection_mapping thumbnail Spoon_fi.jpg?width=300.
- Reflection_mapping wikiPageExternalLink tipFullView.php?l=eng&topicid=16.
- Reflection_mapping wikiPageExternalLink new_page_6.htm.
- Reflection_mapping wikiPageExternalLink ReflectionMapping.
- Reflection_mapping wikiPageExternalLink feature_cube.html.
- Reflection_mapping wikiPageExternalLink ReflectionMapping.
- Reflection_mapping wikiPageID "1755151".
- Reflection_mapping wikiPageLength "9327".
- Reflection_mapping wikiPageOutDegree "46".
- Reflection_mapping wikiPageRevisionID "689173390".
- Reflection_mapping wikiPageWikiLink Black_hole.
- Reflection_mapping wikiPageWikiLink Brushed_metal.
- Reflection_mapping wikiPageWikiLink Category:3D_rendering.
- Reflection_mapping wikiPageWikiLink Category:Demo_effects.
- Reflection_mapping wikiPageWikiLink Computer_graphics.
- Reflection_mapping wikiPageWikiLink Cube_mapping.
- Reflection_mapping wikiPageWikiLink Edwin_Catmull.
- Reflection_mapping wikiPageWikiLink Euclidean_vector.
- Reflection_mapping wikiPageWikiLink Fisheye_lens.
- Reflection_mapping wikiPageWikiLink Gene_Miller.
- Reflection_mapping wikiPageWikiLink Graphics_processing_unit.
- Reflection_mapping wikiPageWikiLink HEALPix.
- Reflection_mapping wikiPageWikiLink Image-based_lighting.
- Reflection_mapping wikiPageWikiLink Jim_Blinn.
- Reflection_mapping wikiPageWikiLink MAGI_Synthavision.
- Reflection_mapping wikiPageWikiLink Map_projection.
- Reflection_mapping wikiPageWikiLink Normal_(geometry).
- Reflection_mapping wikiPageWikiLink Normal_mapping.
- Reflection_mapping wikiPageWikiLink Octahedron_mapping.
- Reflection_mapping wikiPageWikiLink Orthographic_projection.
- Reflection_mapping wikiPageWikiLink Paraboloid_mapping.
- Reflection_mapping wikiPageWikiLink Parallax.
- Reflection_mapping wikiPageWikiLink Paul_Debevec.
- Reflection_mapping wikiPageWikiLink Pre-rendering.
- Reflection_mapping wikiPageWikiLink Pyramid_mapping.
- Reflection_mapping wikiPageWikiLink Ray_tracing_(graphics).
- Reflection_mapping wikiPageWikiLink Reflection_(physics).
- Reflection_mapping wikiPageWikiLink Skybox_(video_games).
- Reflection_mapping wikiPageWikiLink Sphere.
- Reflection_mapping wikiPageWikiLink Sphere_mapping.
- Reflection_mapping wikiPageWikiLink Texel_(graphics).
- Reflection_mapping wikiPageWikiLink File:Cube_mapped_reflection_example.jpg.
- Reflection_mapping wikiPageWikiLink File:Cube_mapped_reflection_example_2.JPG.
- Reflection_mapping wikiPageWikiLink File:Spoon_fi.jpg.
- Reflection_mapping wikiPageWikiLinkText "Environment mapping".
- Reflection_mapping wikiPageWikiLinkText "Reflection mapping".
- Reflection_mapping wikiPageWikiLinkText "environment map".
- Reflection_mapping wikiPageWikiLinkText "environment mapping".
- Reflection_mapping wikiPageWikiLinkText "reflection mapping".
- Reflection_mapping wikiPageWikiLinkText "reflection maps".
- Reflection_mapping wikiPageWikiLinkText "reflection textures".
- Reflection_mapping wikiPageWikiLinkText "reflection vector".
- Reflection_mapping wikiPageWikiLinkText "reflection-mapped".
- Reflection_mapping wikiPageUsesTemplate Template:Reflist.
- Reflection_mapping subject Category:3D_rendering.
- Reflection_mapping subject Category:Demo_effects.
- Reflection_mapping hypernym Technique.
- Reflection_mapping type TopicalConcept.
- Reflection_mapping type Effect.
- Reflection_mapping comment "In computer graphics, environment mapping, or reflection mapping, is an efficient image-based lighting technique for approximating the appearance of a reflective surface by means of a precomputed texture image. The texture is used to store the image of the distant environment surrounding the rendered object.Several ways of storing the surrounding environment are employed.".
- Reflection_mapping label "Reflection mapping".
- Reflection_mapping sameAs Q444148.
- Reflection_mapping sameAs Environment_Mapping.
- Reflection_mapping sameAs 環境マッピング.
- Reflection_mapping sameAs m.05tdds.
- Reflection_mapping sameAs Q444148.
- Reflection_mapping sameAs 反射贴图.
- Reflection_mapping wasDerivedFrom Reflection_mapping?oldid=689173390.
- Reflection_mapping depiction Spoon_fi.jpg.
- Reflection_mapping isPrimaryTopicOf Reflection_mapping.