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# Materials: VMap Commands {#mat_vmap}
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## vmap_backsplash
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### Syntax
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**vmap_backsplash <percent> <distance>**
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2022-10-17 20:33:16 +00:00
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### Overview
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2022-10-03 00:10:54 +00:00
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Controls the percentage of [surface
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light](vmap_surfaceLight) backsplash (how
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much light the emitting surface hits), as well as the distant away from
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the surface of which it is cast. This is really tricky to get right in
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tight areas, so put time aside to experiment.
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**The default backsplash amount is 5%, and the default distance is about
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16 units.**
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