OpenFlight

{{Short description|3D scene description file format}}

{{Infobox file format

| name = OpenFlight geometry format

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| extension = {{mono|.flt}}

| mime = model/flt

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| released = {{Start date|1988|df=yes}}

| standard =

| free =

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| uniform type =

| owner = Presagis

| latest release version = 16.8

| latest release date = {{Start date and age|2021|12|df=yes}}

| genre = 3D file formats

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{{Single source

| date = January 2021

}}

OpenFlight{{cite web|url=http://www.presagis.com/products_services/standards/openflight |title=OpenFlight Standard |publisher=Presagis}} (or .flt) is a 3d geometry model file format originally developed by Software Systems Inc. for its MultiGen{{cite web|url=http://www.presagis.com/about_us/press_room/releases/multigen-paradigm_celebrating_25th_anniversary |title=Multigen-Paradigm 25th Anniversary |publisher=MultiGen-Paradigm}} real-time 3d modeling package in 1988. Originally called Flight, the format was designed as a nonproprietary 3d model format for use by real-time 3d visual simulation image generators. The format was later renamed to OpenFlight to denote its nonproprietary image generation (IG) usage. The MultiGen modeling package (known now as Creator{{cite web|url=http://www.presagis.com/products_services/products/modeling-simulation/content_creation/creator/ |title=Creator - 3D Modeling Software |publisher=Presagis}}) and the OpenFlight format were rapidly adopted by the early commercial flight simulation industry in the later 1980s and early 1990s. NASA Ames was the first customer for the MultiGen modeling package.{{Citation needed|date=February 2015}}

The early advantage OpenFlight held over many 3d geometry model file formats (.obj, .dxf, .3ds) was its specific real-time 3d graphics industry design.{{Citation needed|date=February 2015}} This means that the format is polygon based (rather than NURB surfaces), and provides a real-time tree structure essential for real-time IG systems. Most early graphics file formats, such as Wavefront Technologies, or Alias Systems Corporation{{Citation needed|date=February 2015}}, tried to focus more on visual aesthetics for non-real-time based rendering graphics packages.

The OpenFlight file format is still widely used today in the high end real-time visual simulation industry as the standard interchange format between different IG systems{{Citation needed|date=February 2015}}, and is currently administrated by Presagis.