为进行渲染而发送的材质（只读）。
这是实际发送到 CanvasRenderer 的材质。默认情况下，它与 Graphic.material 相同。扩展 Graphic 时，可以重写此内容以便使发送到 CanvasRenderer 的材质与 Graphic.material 设置的材质不同。这在打算以非破坏性方式修改用户设置的材质时非常有用。
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