Assign Participating Media
Use the Assign tool to apply participating media properties to selected solids. Solids which are not assigned any participating media model are considered as non-participating.
- 
                From the Radiation ribbon, click the
                            Assign tool.
                
Figure 1. 
 - Select solids.
 - 
                In the microdialog, assign a participating media model
                    from the drop-down menu or select Participating Media Model
                        Library to create, edit, and manage custom participating media
                    models.
                Either fluid or solid domains can be defined as participating media.
 - 
                From the guide bar, execute the command in the following
                    ways:
                
- Click 
 to confirm your selection and remain in the
                            tool.This allows you to continue creating instances and helps you visualize and edit instances with the legend.
 - Click 
 to confirm your selection and exit the
                        tool. 
 - Click