効果的に機能を無効にし、シェーダーをまったく使用しない。
This is primarily used as a build size optimization, for example if you know the project never uses deferred shading,
you could disable support for it in Graphics Settings and save some build data size.
When BuiltinShaderType.DeferredReflections is disabled, then in deferred shading the reflection probes are done in
per-object way, instead of a separate deferred per-pixel reflections pass.
関連項目: GraphicsSettings.SetShaderMode, BuiltinShaderType, Graphics Settings.