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                            [TOC]

## 三角形網絡
一種由頂點( vertex)集合和索引( index)集合描述圖形的方法

![](https://img.kancloud.cn/41/45/41453302a6e1dc322bf5824fb568d510_400x292.png)

為什么用三角形?
- 三個點可以確定一個平面
- 唯一 (三個點確定一個三角形);效率高,方便描述
- 數學模型更加簡單(判斷投影是否在三角形內)

## 球面網絡繪制
![](https://img.kancloud.cn/15/2f/152fe2207abbd4c514a1a045c59bb66f_400x372.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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