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@@ -817,7 +817,9 @@ M^{(4\times4)}_{persp \rightarrow ortho}
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\begin{pmatrix}
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nx \\ ny \\ n^2 \\ n
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\end{pmatrix}
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-\\
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+$$
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+
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+$$
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设M^{(4\times4)}_{persp \rightarrow ortho}第三行为
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\begin{pmatrix}
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A & B & C & D
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@@ -829,9 +831,13 @@ M^{(4\times4)}_{persp \rightarrow ortho}
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\begin{pmatrix}
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x \\ y \\ n \\ 1
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\end{pmatrix} = n^2
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-\\
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+$$
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+
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+$$
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得到A=0, B=0, C*n + B = n^2
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-\\
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+$$
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+
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+$$
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M^{(4\times4)}_{persp \rightarrow ortho}
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\begin{pmatrix}
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0 \\ 0 \\ f \\ 1
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@@ -842,9 +848,13 @@ M^{(4\times4)}_{persp \rightarrow ortho}
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\begin{pmatrix}
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0 \\ 0 \\ f^2 \\ f
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\end{pmatrix}
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-\\
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+$$
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+
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+$$
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带入前面推理(0, 0, C, D)式子中，得到 Cf + D = f^2
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-\\
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+$$
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+
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+$$
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\begin{matrix}
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Cn + D = n^2 \\
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Cf + D = f^2
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@@ -854,7 +864,9 @@ M^{(4\times4)}_{persp \rightarrow ortho}
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C = n + f \\
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D = -nf
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\end{matrix}
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-\\
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+$$
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+
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+$$
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M^{(4\times4)}_{persp \rightarrow ortho} =
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\begin{pmatrix}
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n & 0 & 0 & 0 \\
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