Light importance volume

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This is a point entity available in all Source 2 games since Destinations.

Confirm:Was there an earlier appearance of this entity?

If using an engine version that has Lightmap Player Space, use it instead - Read more about Lightmap Player Space here: Lighting

A description from the SteamVR entity guide on light importance volumes reads, "Sets the high quality lighting area for the photon mapping lighting baker." (SteamVR Environments Entity Guide)

It is recommended that Lightmap Player Spaces be used instead of light importance volumes.