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extern int UF_MODL_create_plane ( double origin_point[ 3 ], double plane_normal[ 3 ], tag_t * plane_tag );
创建平面
tag_t plane1_tag;
origin_point[0] = 0.0; origin_point[1] = 0.0; origin_point[2] = 5.0;
pl1_normal[0] = 0.0; pl1_normal[1] = 0.0; pl1_normal[2] = 1.0;
UF_CALL(UF_MODL_create_plane(origin_point, pl1_normal,