POV-Ray : Documentation : 2.5.4 Halo
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2.5.4 Halo

Earlier versions of POV-Ray used a feature called halo to simulate fine particles such as smoke, steam, fog, or flames. The halo statement was part of the texture statement. This feature has been discontinued and replaced by the interior and media statements which are object modifiers outside the texture statement.

See "Why are Interior and Media Necessary?" for a detailed explanation on the reasons for the change. See "Media" for details on media.

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