High-dynamic-range rendering: Difference between revisions

Revision as of 09:35, 22 June 2021

Revision as of 18:33, 23 June 2021

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{{Short description|Rendering of computer graphics scenes by using lighting calculations done in high-dynamic-range}}

[[File:Lost Coast HDR comparison.png|thumb|300px|right|A comparison of the standard fixed-aperture rendering (left) with the HDR rendering (right) in the video game ''[[Half-Life 2: Lost Coast]]'']]

'''High-dynamic-range rendering''' ('''HDRR''' or '''HDR rendering'''), also known as '''high-dynamic-range lighting''', is the [[Rendering (computer graphics)|rendering]] of [[computer graphics]] scenes by using [[computer graphics lighting|lighting]] calculations done in [[high dynamic range]] (HDR). This allows preservation of details that may be lost due to limiting [[contrast ratio]]s. [[Video game]]s and [[Computer animation|computer-generated movies and special effects]] benefit from this as it creates more realistic scenes than with the more simplistic lighting models used.

Graphics processor company [[Nvidia]] summarizes the motivation for HDR in three points: bright things can be really bright, dark things can be really dark, and details can be seen in both.<ref name="6800_Leagues_HDR">{{cite web | url= http://download.nvidia.com/developer/presentations/2004/6800_Leagues/6800_Leagues_HDR.pdf | title= High Dynamic Range Rendering (on the GeForce 6800) | author= Simon Green and Cem Cebenoyan | year= 2004 | publisher= nVidia | work= [[GeForce 6]] Series | page= 3 }}</ref>

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| url = http://www.debevec.org/Research/IBL/ }}</ref> These two papers laid the framework for creating HDR ''light probes'' of a ___location, and then using this probe to light a rendered scene.

HDRI and HDRL (high-dynamic-range image-based lighting) have, ever since, been used in many situations in 3D scenes in which inserting a 3D object into a real environment requires the lightprobelight probe data to provide realistic lighting solutions.

In gaming applications, ''[[Riven|Riven: The Sequel to Myst]]'' in 1997 used an HDRI postprocessing shader directly based on Spencer's paper.<ref name="computergraphicsworld">{{cite journal|author=Forcade, Tim|date=February 1998|title=Unraveling Riven|journal=Computer Graphics World}}</ref> After [[Electronic Entertainment Expo|E3]] 2003, [[Valve Corporation|Valve]] released a demo movie of their [[Source engine]] rendering a cityscape in a high dynamic range.<ref>