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@@ -91,6 +91,22 @@ $$
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P 的坐标可以通过 P = (1-n) * A + n * B 得到，进而得到 P 的坐标计算公式
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+假设 A 点坐标为 (0, Y1, Z1) ，B 点坐标为 (0, Y2, Z2)
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+
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$$
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+Z_n = (1-n) * Z_1 + n * Z_2
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+\\
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+Z_n = \frac{(1-m) * Z_2}{(1-m)*Z_2 + m*Z_1} * Z_1 + \frac{m*Z_1}{(1-m)*Z_2 + m*Z_1} * Z_2
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+\\
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+Z_n = \frac{1}{\frac{1-m}{Z_1} + \frac{m}{Z_2}}
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+$$
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+
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+带入到三维场景中
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$$
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+Z_n = \frac{1}{\frac{1-u-v}{Z_1} + \frac{u}{Z_2} + \frac{v}{Z_3}}
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+$$
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+
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+u、v 满足 P = (1-u-v)*A + u*B + v*C
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+
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