Gets the normal vector n=(n1,n2,n3) of the normal coordinate form of the plane n1*x + n2*y + n3*z = d, |n|=1, d>0.

**Namespace:**
ceometric.VectorGeometry

**Assembly:**
ceometric.VectorGeometry (in ceometric.VectorGeometry.dll) Version: 1.8.0.0 (1.8.0.0)

# Syntax

C# |
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public Vector3d NCF_normal { get; } |

Visual Basic (Declaration) |
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Public ReadOnly Property NCF_normal As Vector3d |

Visual C++ |
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public: property Vector3d^ NCF_normal { Vector3d^ get (); } |

#### Field Value

A normalized normal vector of the plane.# Remarks

The normal coordinate form (NCF) is a special form of the coordinate form a*x + b*y + c*z = d. In the
normal coordinate form, the normal vector n = (a,b,c) of the coordinate form is normalized (|n|=1). In addition,
the resulting equation n1*x + n2*y + n3*z = d is factored so that d >= 0 is guaranteed.

One advantage of the NCF over the coordinate form is that for a point p to test, the value

- NCF_normal * p - NCF_d is zero if the point lies on the plane,
- NCF_normal * p - NCF_d is positive if the point p and the origin are divided by the plane and
- NCF_normal * p - NCF_d is negative if the point p and the origin lie on the same side of the plane.

Also, Math.Abs(NCF_d) directly gives the distance of the plane to the origin.