3ds max Lighting Assigning a diffuse material Now we’ll assign it to all of the objects in the scene. Open up the scene explorer. I closed that previously, so I’ll open it from the main toolbar. And select all of the objects. Select the first object on the list, scroll all the way down to the bottom, hold down shift and select the last object in the list. And now they’re all selected. Back in the material editor, click on it’s title bar to give it focus, and with the diffuse material selected .