测试写法

图形学/图形学.md

@@ -50,8 +50,27 @@ $$
 
 点乘的运算
 
-- 2D： $\vec{a} \cdot \vec{b} = (^{x_a} _{y_a}) \cdot (^{x_b} _{y_b}) = x_a*x_b + y_a*y_b $ 
-- 3D： $\vec{a} \cdot \vec{b} = \begin{pmatrix}x_a \\ y_a \\ z_a\end{pmatrix} \cdot \begin{pmatrix} x_b \\ y_b \\ y_c \end{pmatrix} = x_a * x_b + y_a * y_b + z_a * z_b $ 
+- 2D： 
+
+$
+\vec{a} \cdot \vec{b} = 
+(^{x_a} _{y_a}) 
+\cdot 
+(^{x_b} _{y_b}) 
+= x_a*x_b + y_a*y_b 
+$ 
+
+- 3D： 
+  
+$
+\vec{a} \cdot \vec{b} = 
+\begin{pmatrix}
+x_a \\ y_a \\ z_a\
+end{pmatrix} 
+\cdot 
+\begin{pmatrix} x_b \\ y_b \\ y_c \end{pmatrix} 
+= x_a * x_b + y_a * y_b + z_a * z_b 
+$ 
 
 ![](./Image/001.png)