# HDRI

HDRI maps are a powerful way to light scenes and add realistic reflections. Every project in Vectary comes with a default [HDRI environment](https://help.vectary.com/documentation/design-process/environment) that provides basic lighting by default. You can choose from a range of HDRI maps available in the [built-in library](https://help.vectary.com/documentation/design-process/libraries/environments-library) via the Environment settings, or import a custom HDRI file. However, keep in mind that HDRI maps can dramatically increase project size — especially when imported in high resolution.

#### Tips & recommendations

* **Check file size before importing** – HDRI files, particularly custom ones, can be very large. Always verify the file size and consider optimizing before upload.<br>

* **Reduce resolution if possible** – HDRI resolution has a direct impact on its file size. If your scene doesn’t rely on fine background detail, consider using a lower resolution HDRI to reduce load times.\
  HDRI resolution can be adjusted directly in Studio — in the Environment settings.\
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  ![](https://2973737105-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FAXNLyKVZ2tvtyDr8sVES%2Fuploads%2Fpyx2y7qqCTxeEgquuyEH%2Fimage.png?alt=media\&token=d29bf8cf-76a0-4abf-8231-b75641edbc70)

* **Use compression** – when exporting or preparing HDRI files, consider using **DWAA** or **DWAB** compression. These methods can significantly reduce file size without major visual loss.