Rasagar/Library/PackageCache/com.unity.shadergraph/Documentation~/Normal-From-Height-Node.md
2024-08-26 23:07:20 +03:00

2.3 KiB

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));
}