34 lines
2.1 KiB
Markdown
34 lines
2.1 KiB
Markdown
# IES profile
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IES profiles describe how light spreads for a given direction. They are similar to [light cookies](https://docs.unity3d.com/Manual/Cookies.html) in that they use a multiplier mask to achieve this goal. The Unity IES profile supports Point, Spot (Cone, Pyramid, Box), and Area (Rectangular) [Lights](Light-Component.md).
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The main benefit of using IES profiles over cookies is that light manufacturers provide the profiles. This means that they are physically accurate to the real-world light they represent and also artists do not need to dedicate time authoring them.
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You can mix the IES profile with cookies and even use the profile and cookie mix for [light map baking](https://docs.unity3d.com/Manual/LightMode-Baked.html).
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## Using IES profiles
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In Unity, when you import an IES profile into the editor, the [importer](IES-Importer.md) automatically creates a [Light](Light-Component.md) Prefab. The Prefab includes the IES profile and sets the correct light intensity. In order to have a physically correct light in your scene, drag the Prefab into the Scene view or Hierarchy, then tweak the temperature color.
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For information on the IES profile importer, see the [IES importer documentation](IES-Importer.md).
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## IES profile providers
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There are many providers you can use to source IES profiles. Real-world light manufacturers provide IES profiles to match the physical lights they produce. Also, some lighting artists create and share IES profiles.
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**Real-world manufacturers**
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- [Philips](https://www.usa.lighting.philips.com/support/support/literature/photometric-data)
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- [Lithonia Lighting](https://lithonia.acuitybrands.com/resources/technical-downloads/photometricdownloads)
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- [Efficient Lighting Systems](http://elslighting.com.au/downloads/ies-files/)
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- [Atlas](https://www.atlaslightingproducts.com/ies-files)
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- [Erco](https://www.erco.com/download/en)
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- [Lamp](https://www.lamp.es/en/products_1791?pd-type=indoor)
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- [Osram](https://www.osram.com/cb/)
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**Artist sources**
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- [Renderman](https://renderman.pixar.com/ies-profiles)
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