小地图的制作（UGUI)

一、创建一个Plane和Cube，调整合适位置，再创建一个Camera，重命名为MiniMapCamera，调整摄像机让其视野朝下，Projection为Orthographic，调整size到合适大小
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二、创建Renderer Texture重命名为MiniMapTexture，并将MiniMapTexture拖拽至MiniMapCamera的Target Texture下
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三、Create——UI——RawImage，生成Canvas和RawImage，在Canvas下创建一个空对象命名为MiniMap，然后在MiniMap下创建Image重命名为Mask，并添加Mask组件，可修改Source Image为Knob（圆形image）。将RawImage拖拽至Mask下
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四、将MiniMapTexture拖拽至RawImage的Texture下，如果RawImage位置不和Mask重合，则Reset下位置，至此就可以看到小地图了，将其拖至合适位置
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五、为了美观可以在Mask下再新建一个RawImage对象，将其重命名为Border，选择Texture为自己喜欢的图片
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六、将PC-2图标拖入主角Cube下，调整PC-2合适位置（PC-2为小地图显示的图标），新建两个层Player和MiniMap，Cube选择Player层，PC-2选择MiniMap层，然后让Main Camera渲染除了MiniMap以外的层，让MiniMapCamera渲染除了Player的层，这样小地图显示的就是PC-2代替主角的图标
下图为PC-2选择MiniMap层，Cube同理
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下图为MiniMapCamera的Culling Mask层的选择，Main Camera同理
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