在使用UGUI制作时，当大量的文本使用了Outline和Shadow，则可能会报以下错误：
ArgumentException: Mesh can not have more than 65000 vertices
UnityEngine.UI.VertexHelper.FillMesh (UnityEngine.Mesh mesh) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Utility/VertexHelper.cs:206)
UnityEngine.UI.Graphic.DoMeshGeneration () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Graphic.cs:591)
UnityEngine.UI.Graphic.UpdateGeometry () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Graphic.cs:573)
UnityEngine.UI.Text.UpdateGeometry () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Text.cs:571)
UnityEngine.UI.Graphic.Rebuild (UnityEngine.UI.CanvasUpdate update) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Graphic.cs:534)
UnityEngine.UI.CanvasUpdateRegistry.PerformUpdate () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/CanvasUpdateRegistry.cs:198)
UnityEngine.Canvas:SendWillRenderCanvases() (at C:/buildslave/unity/build/Runtime/UI/ScriptBindings/UICanvas.bindings.cs:72)说明顶点撑爆了，描边和阴影很费顶点