A karst cave model is constructed from the point cloud data

Signed-off-by: 刘明宏 <liuminghong@mail.sdu.edu.cn>

3DIrregularBodyTest/curve_12.txt

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+% Model:    Tunnel.mph 
+% Version:  COMSOL 
+% Date:     May 2023 
+% Dimension:      3 
+% Nodes:100 
+% Elements:100 
+% Expressions:     1 
+% Description:        Contour 
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