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為了能使河流流動起來，我們會把河流的UV根據河流流向掰直，如下圖：

![](https://img.kancloud.cn/45/93/45939146869dcc1656cbff0e515fa7d9_1472x845.png)

河流效果如下圖:

![](https://img.kancloud.cn/68/cd/68cd7b3aa884f957eed51186ac31b0ec_958x533.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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