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# Materials: VMap Commands {#mat_vmap}
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## vmap_lightmapmergable
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### Syntax
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**vmap_lightmapMergable**
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2022-10-17 20:33:16 +00:00
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### Overview
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When specified, the compiler will attempt to merge all surfaces using
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this material together onto lightmap sheets. This can drastically reduce
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the artifacts occuring on surfaces like terrain where precision issues
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might get you black spots along the lightmap seams. Definitely use this
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across large collections of surfaces on which you expect smooth
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transitions.
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