Virtual Emitters are GI injectors that can be placed anywhere in the scene. This feature must be enabled in the Radiant Gi inspector:
To add a virtual emitter to your scene, select the top menu GameObject -> Create Other -> Radiant GI -> Virtual Emitter.
You can also add the RadiantVirtualEmitter script to any gameobject or character in the scene.
The following image show the properties that can be configured per virtual emitter:
Please note that light from virtual emitters can leak through walls. Use the Box Center / Box Size properties to limit the volume where the light of this virtual emitter can be used.