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- Beam_tracing abstract "Beam tracing is an algorithm to simulate wave propagation.It was developed in the context of computer graphics to render 3D scenes,but it has been also used in other similar areas such as acoustics andelectromagnetism simulations.Beam tracing is a derivative of the ray tracing algorithm that replaces rays, which have no thickness, with beams. Beams are shaped like unbounded pyramids, with (possibly complex) polygonal cross sections. Beam tracing was first proposed by Paul Heckbert and Pat Hanrahan.In beam tracing, a pyramidal beam is initially cast through the entire viewing frustum. This initial viewing beam is intersected with each polygon in the environment, typically from nearest to farthest. Each polygon that intersects with the beam must be visible, and is removed from the shape of the beam and added to a render queue. When a beam intersects with a reflective or refractive polygon, a new beam is created in a similar fashion to ray-tracing.A variant of beam tracing casts a pyramidal beam through each pixel of the image plane. This is then split up into sub-beams based on its intersection with scene geometry. Reflection and transmission (refraction) rays are also replaced by beams.This sort of implementation is rarely used, as the geometric processes involved are much more complex and therefore expensive than simply casting more rays through the pixel. Cone tracing is a similar technique using a cone instead of a complex pyramid.Beam tracing solves certain problems related to sampling and aliasing, which can plague conventional ray tracing approaches. Since beam tracing effectively calculates the path of every possible ray within each beam (which can be viewed as a dense bundle of adjacent rays), it is not as prone to under-sampling (missing rays) or over-sampling (wasted computational resources). The computational complexity associated with beams has made them unpopular for many visualization applications. In recent years, Monte Carlo algorithms like distributed ray tracing (and Metropolis light transport?) have become more popular for rendering calculations.A 'backwards' variant of beam tracing casts beams from the light source into the environment. Similar to backwards raytracing and photon mapping, backwards beam tracing may be used to efficiently model lighting effects such as caustics. Recently the backwards beam tracing technique has also been extended to handle glossy to diffuse material interactions (glossy backward beam tracing) such as from polished metal surfaces.Beam tracing has been successfully applied to the fields of acoustic modelling and electromagnetic propagation modelling. In both of these applications, beams are used as an efficient way to track deep reflections from a source to a receiver (or vice versa). Beams can provide a convenient and compact way to represent visibility. Once a beam tree has been calculated, one can use it to readily account for moving transmitters or receivers.Beam tracing is related in concept to cone tracing.".
- Beam_tracing wikiPageID "1669406".
- Beam_tracing wikiPageLength "4812".
- Beam_tracing wikiPageOutDegree "31".
- Beam_tracing wikiPageRevisionID "655054351".
- Beam_tracing wikiPageWikiLink 3D_computer_graphics.
- Beam_tracing wikiPageWikiLink Acoustics.
- Beam_tracing wikiPageWikiLink Algorithm.
- Beam_tracing wikiPageWikiLink Aliasing.
- Beam_tracing wikiPageWikiLink Category:Global_illumination_algorithms.
- Beam_tracing wikiPageWikiLink Caustic_(optics).
- Beam_tracing wikiPageWikiLink Complex_polygon.
- Beam_tracing wikiPageWikiLink Computer_graphics.
- Beam_tracing wikiPageWikiLink Cone_tracing.
- Beam_tracing wikiPageWikiLink Distributed_ray_tracing.
- Beam_tracing wikiPageWikiLink Electromagnetism.
- Beam_tracing wikiPageWikiLink Image_plane.
- Beam_tracing wikiPageWikiLink Metropolis_light_transport.
- Beam_tracing wikiPageWikiLink Monte_Carlo_method.
- Beam_tracing wikiPageWikiLink Pat_Hanrahan.
- Beam_tracing wikiPageWikiLink Paul_Heckbert.
- Beam_tracing wikiPageWikiLink Photon_mapping.
- Beam_tracing wikiPageWikiLink Pixel.
- Beam_tracing wikiPageWikiLink Polygon.
- Beam_tracing wikiPageWikiLink Ray_tracing_(graphics).
- Beam_tracing wikiPageWikiLink Reflection_(physics).
- Beam_tracing wikiPageWikiLink Refraction.
- Beam_tracing wikiPageWikiLink Rendering_(computer_graphics).
- Beam_tracing wikiPageWikiLink Sample_(signal).
- Beam_tracing wikiPageWikiLink Sampling_(signal_processing).
- Beam_tracing wikiPageWikiLink Viewing_frustum.
- Beam_tracing wikiPageWikiLink Wave_propagation.
- Beam_tracing wikiPageWikiLinkText "Beam tracing".
- Beam_tracing wikiPageWikiLinkText "beam tracing".
- Beam_tracing hasPhotoCollection Beam_tracing.
- Beam_tracing subject Category:Global_illumination_algorithms.
- Beam_tracing hypernym Algorithm.
- Beam_tracing type Software.
- Beam_tracing type Algorithm.
- Beam_tracing comment "Beam tracing is an algorithm to simulate wave propagation.It was developed in the context of computer graphics to render 3D scenes,but it has been also used in other similar areas such as acoustics andelectromagnetism simulations.Beam tracing is a derivative of the ray tracing algorithm that replaces rays, which have no thickness, with beams. Beams are shaped like unbounded pyramids, with (possibly complex) polygonal cross sections.".
- Beam_tracing label "Beam tracing".
- Beam_tracing sameAs m.05m2k9.
- Beam_tracing sameAs Q4876194.
- Beam_tracing sameAs Q4876194.
- Beam_tracing wasDerivedFrom Beam_tracing?oldid=655054351.
- Beam_tracing isPrimaryTopicOf Beam_tracing.