Normal From Height Node#

Description#

Creates a normal map from a height value defined by input Input with a strength defined by input Strength.

Ports#

Name	Direction	Type	Description
In	Input	Float	Input height value
Strength	Input	Float	The strength of the output normal. Considered in real-world units, recommended range is 0 - 0.1 .
Out	Output	Vector 3	Output value

Controls#

Name	Type	Options	Description
Output Space	Dropdown	Tangent, World	Sets the coordinate space of the output normal.

Generated Code Example#

The following example code represents one possible outcome of this node per Output Space mode.

Tangent

void Unity_NormalFromHeight_Tangent_float(float In, float Strength, float3 Position, float3x3 TangentMatrix, out float3 Out)
{
    float3 worldDerivativeX = ddx(Position);
    float3 worldDerivativeY = ddy(Position);

    float3 crossX = cross(TangentMatrix[2].xyz, worldDerivativeX);
    float3 crossY = cross(worldDerivativeY, TangentMatrix[2].xyz);
    float d = dot(worldDerivativeX, crossY);
    float sgn = d < 0.0 ? (-1.0f) : 1.0f;
    float surface = sgn / max(0.000000000000001192093f, abs(d));

    float dHdx = ddx(In);
    float dHdy = ddy(In);
    float3 surfGrad = surface * (dHdx*crossY + dHdy*crossX);
    Out = normalize(TangentMatrix[2].xyz - (Strength * surfGrad));
    Out = TransformWorldToTangent(Out, TangentMatrix);
}

World

void Unity_NormalFromHeight_World_float(float In, float Strength, float3 Position, float3x3 TangentMatrix, out float3 Out)
{
    float3 worldDerivativeX = ddx(Position);
    float3 worldDerivativeY = ddy(Position);

    float3 crossX = cross(TangentMatrix[2].xyz, worldDerivativeX);
    float3 crossY = cross(worldDerivativeY, TangentMatrix[2].xyz);
    float d = dot(worldDerivativeX, crossY);
    float sgn = d < 0.0 ? (-1.0f) : 1.0f;
    float surface = sgn / max(0.000000000000001192093f, abs(d));

    float dHdx = ddx(In);
    float dHdy = ddy(In);
    float3 surfGrad = surface * (dHdx*crossY + dHdy*crossX);
    Out = normalize(TangentMatrix[2].xyz - (Strength * surfGrad));
}