请问关于Transformation Matrix(转换矩阵)?

王咣生

能帮我解释一个：

' Rotation Matrix: 90 Degrees about point 0,0,0
        ' 0.000000  -1.000000  0.000000  0.000000
        ' 1.000000  0.000000  0.000000  0.000000
        ' 0.000000  0.000000  1.000000  0.000000
        ' 0.000000  0.000000  0.000000  1.000000
        
' Rotation Matrix: 45 Degrees about point 5,5,0
        ' 0.707107  -0.707107  0.000000  5.000000
        ' 0.707107  0.707107  0.000000  -2.071068
        ' 0.000000  0.000000  1.000000  0.000000
        ' 0.000000  0.000000  0.000000  1.000000
        
' Translation Matrix: move an object by 10,10,0
        ' 1.000000  0.000000  0.000000  10.000000
        ' 0.000000  1.000000  0.000000  10.000000
        ' 0.000000  0.000000  1.000000  0.000000
        ' 0.000000  0.000000  0.000000  1.000000

' Scaling Matrix: scale by 10,10 at point 0,0,0
        ' 10.000000  0.000000  0.000000  0.000000
        ' 0.000000  10.000000  0.000000  0.000000
        ' 0.000000  0.000000  10.000000  0.000000
        ' 0.000000  0.000000  0.000000  1.000000
        
' Scaling Matrix: scale by 10 at point 2,2
        ' 10.000000  0.000000  0.000000  -18.000000
        ' 0.000000  10.000000  0.000000  -18.000000
        ' 0.000000  0.000000  10.000000  0.000000
        ' 0.000000  0.000000  0.000000  1.000000
是什么意思吗? 比如最后一个 "at point 2,2"在哪里体现出来的?
怎么构造一个自己需要的转换矩阵?