提供源材质。
返回的材质将分配给渲染器。
如果返回 null,Unity 将使用其默认材质查找/生成方法来分配材质。
系统会在导入 sourceMaterial
之前直接从模型中生成 sourceMaterial,并在执行 OnAssignMaterial 之后立即将其销毁。
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