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struct SecPlane play
{
double D;
double NegiC;
vector3 Normal;
void ChangeHeight(double hdiff);
double GetChangedHeight(double hdiff) const;
double HeightDiff(double oldd, double newd = 0.0) const;
bool IsEqual(SecPlane other) const;
bool IsSlope() const;
int PointOnSide(vector3 pos) const;
double PointToDist(vector2 xy, double z) const;
double ZAtPointDist(vector2 v, double dist) const;
clearscope double ZAtPoint(vector2 v) const;
}
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