This is an array of all materials used by the renderer. Unity supports a single object
using multiple materials; in this case
sharedMaterials contains all the materials.
sharedMaterial and material properties return the first used material if
there is more than one.
Modifying any material in
sharedMaterials will change the appearance of all objects
using this material, and change material settings that are stored in the project too.
It is not recommended to modify materials returned by sharedMaterials. If you want to modify the material of a renderer use material instead.
Note that like all arrays returned by Unity, this returns a copy of materials array. If you want to change some materials in it, get the value, change an entry and set materials back.
関連項目: material、sharedMaterial プロパティー .