用实验数据得到的点如下：
-5.545768, 15.008146, 30
-9.196386, 13.092994, 30
-11.824503, 10.778735, 30
-14.427383, 6.917414, 30
-15.503095, 3.956519, 30
-16.000000, 0.000000, 30
-15.626974, -3.434776, 30
-14.245435, -7.284750, 30
-8.681872, -13.439683, 30
-11.891105, -10.705214, 30
5.088262, -15.169364, 30
8.878398, -13.310674, 30
12.010787, -10.570762, 30
14.997223, -5.575241, 30
15.829736, -2.327974, 30
15.943205, 1.346927, 30
15.378432, 4.416314, 30
14.460370, 6.848189, 30
12.801503, 9.597996, 30
11.516156, 11.107571, 30
7.662118, 14.046065, 30
2.890859, 15.736675, 30
-10.138073, 14.873449, 40
-12.928258, 12.524382, 40
-15.360014, 9.384561, 40
-18.000000, 0.000000, 40
-15.999827, -8.246546, 40
5.542939, -17.125298, 40
11.624791, -13.742788, 40
14.272041, -10.968538, 40
17.337646, -4.837979, 40
-3.575726, 17.641264, 40
0.795782, 17.982401, 40
17.957093, 1.242100, 40
16.419387, 7.375889, 40
-1.354937, -14.536992, 23
-11.462673, -9.042518, 23
-14.600000, 0.000000, 23
-14.350888, 2.685520, 23
-12.604362, 7.368179, 23
-9.207010, 11.330974, 23
-5.573404, 13.494339, 23
-1.379245, 14.534706, 23
6.206349, 13.215190, 23
13.492637, 5.577521, 23
14.599573, -0.111694, 23
12.932728, -6.775289, 23
3.601523, -14.148817, 23
8.798723, -11.650857, 23
用sFTOOL可以拟合出一个较好的显示曲面方程，(f(x,y) =-9.047 +0.9012*x + 4.588*y + 23.23*x^2 + 0.05602*x*y + 17.31*y^2)
但是是显式曲面，但我要用隐式的方程来求颗粒冲蚀角度，怎么把这个显式的曲面方程变成隐式的啊？？？跪求
土图腾.png
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