# Assign Modifier Sets

Materials that we use for any Radiance related simulations is called **Modifier**. We have also added a new concept **Modifier Set** for a group of modifiers. Modifier set is useful in cases when users want to have a global control of all modifiers that apply to the entire project, and easier for reporting a modifier summary.

{% embed url="<https://www.youtube.com/watch?v=lV9nJTqzjhg&list=PLHnzKQMrclYmtPc_ISoD6vdjtPG3786S0&index=12>" %}

## Step 1

Use command [PO\_EditRoomProperties](https://docs.pollination.solutions/user-manual/rhino-plugin/pollination-commands/alphabetically/po_editroomproperties) or double click the room from "Room Manager" to bring up the "Room Properties" dialog, in which you can override room's modifier set.

![](https://2884583650-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MaZZSUE1L_iKrqfreV9%2Fuploads%2Fgit-blob-ac4e1f38c20591660718126687c0a79ea8ba2a3d%2Fimage.png?alt=media\&token=f577c9ab-8dad-48ef-b05d-d0f3d2e35c57)

## Step 2

From ModifierSet manager, select a modifier set that you want to apply to the room. You can also double click the selected item or click Edit button to review the details of this modifier set.

![Select one modifier set from the list](https://2884583650-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MaZZSUE1L_iKrqfreV9%2Fuploads%2Fgit-blob-f1cf939cef001a1dd60d6464f571be1aa7acbc1c%2Fimage.png?alt=media\&token=222608eb-079a-42b8-af5c-3f1fadf0ba3b)

![Review and edit modifier set](https://2884583650-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MaZZSUE1L_iKrqfreV9%2Fuploads%2Fgit-blob-b0cff572aebd2532582ae9b8b36225049a9ebfe3%2Fimage.png?alt=media\&token=68979b28-856d-4823-84a6-4808897ef3bb)