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In normal 3D modelling for animation this is called 'creating a reflection map'. A normal 3D package will just do it and in the environment you can have more th
by Theodores 12y ago
In normal 3D modelling for animation this is called 'creating a reflection map'. A normal 3D package will just do it and in the environment you can have more than the one 2D flat shape (e.g. the floor/ceiling here). Plus you can accommodate a change in position of the light fixture.
In another discipline - maps - we are talking projections. Personally I would like a globe of the illuminated variety with a paper cylinder around it getting a Mercator projection on it.
Either way, the maths and software for this has been on the desktop for at least 25 years (render times were a while back then).
- mxfh 12y agoYou won't get a proper global Mercator map through light projection (a so called geometric projection) from a sphere, the relation is purely mathematical. A central cylindrical projection is what you get when you put a light in the center of a sphere and project that on a cylinder http://www.progonos.com/furuti/MapProj/Normal/ProjCyl/ProjCEA/projCEA.html http://www.progonos.com/furuti/MapProj/Normal/ProjCyl/ProjCE... https://en.wikipedia.org/?title=User:Peter_Mercator/Draft_for_Mercator#Mercator:_the_rhumb_straightened https://en.wikipedia.org/?title=User:Peter_Mercator/Draft_fo... You could get pretty close with Braun type stereographical for non-global uses with a fixed light source. http://www.progonos.com/furuti/MapProj/Normal/CartHow/HowBraunC/howBraunC.html http://www.progonos.com/furuti/MapProj/Normal/CartHow/HowBra...