# 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](/user-manual/rhino-plugin/pollination-commands/alphabetically/po_editroomproperties.md) or double click the room from "Room Manager" to bring up the "Room Properties" dialog, in which you can override room's modifier set.

![](/files/-MegbHl3ArzMXS7V6WbB)

## 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](/files/-Megc28SVYu8m5ZITJI3)

![Review and edit modifier set](/files/-Megceu0vMR9yy1NBIcw)


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