This option allows the edition of already created materials. When the user selects this option, the following panel appears:

Figure 1. Edit Material panel

The user can select the material to edit in the drop-down list next to the "Select material to edit:" label. It is possible to edit the color of the selected material by double-clicking the box next to the "Color" label. The "Set Parameters" button allows the user to modify the reflection/transmission coefficients of the materials. For more details on the edition of the parameters of a material, refer to the "Add" section.