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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.
More about "Media"
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