All the objects in Owlet scene share the same list of materials. You can use the same material on several objects and if you change the material, all the objects will be updated. Owlet keeps the list of scene materials in the scene materials panel for your convenience.
On the screenshot above Owlet displays the list of currently loaded materials. Not all of them are being used, but the scene still keeps them.
There is a bottom menu that allows you to alter the list or do something with materials.
There is also “default” material that is not shown in the list. Owlet use that material for the meshes that have no materials assigned. If you create a mesh - it will get the default material. If you delete a material that is being used by a mesh - that mesh will also get the default material. You can’t edit that material, it is used to let Owlet keep rendering the meshes that have no materials.
The Scene menu lets you do some useful tricks with the selected materials:
There are two items there that may ease up your life a bit:
These actions are good together, say if you need to replace a material with another. You select the material, then select all the meshes with that material, then select another material and finally apply that material to all the selected objects.
Besides the Scene -> Apply material to selected geometry there is an easier way to assign material to a shape. You simply drag and drop the material onto the shape you want and it is automatically assigned to it.
If you have a scene material and you want to replace it with another one, and also update all the meshes to use the new material, there are two options. The first one is obvious yet long:
The second option is somewhat faster. Simply drag the new material on top of the old one in the scene materials list. Wait a few seconds until the old material gets selected, then drop the new material on it. This will update the old material with the new one, leaving just its name. If you want to keep the old material, as well, you need to duplicate it first, then update the original one.