Normal Blend Node

Description

Blends two normal maps defined by inputs A and B, normalizing the result to produce a valid normal map representing the combined surface detail.

Ports

Name	Direction	Type	Binding	Description
A	Input	Vector 3	None	First input normal map
B	Input	Vector 3	None	Second input normal map
Out	Output	Vector 3	None	Blended normal map

Controls

Name	Type	Options	Description
Mode	Dropdown	Default	Blends the two normal maps by adding their x and y components and multiplying their z components, then normalizes the result to ensure a valid normal direction.
Mode	Dropdown	Reoriented	Blends the two normal maps using a mathematically correct method, ensuring the resulting normal map represents a realistic combined surface.

Generated Code Example

The following example code demonstrates how the node blends normals in each Mode:

Default

Adds the x and y components (R and G channels) of the input normals, multiplies the z components (B channel), then normalizes the result.

void Unity_NormalBlend_float(float3 A, float3 B, out float3 Out)
{
    Out = normalize(float3(A.rg + B.rg, A.b * B.b));
}

Reoriented

Blends the input normals using a reoriented method that makes the resulting surface normal look realistic.

void Unity_NormalBlend_Reoriented_float(float3 A, float3 B, out float3 Out)
{
    float3 t = A.xyz + float3(0.0, 0.0, 1.0);
    float3 u = B.xyz * float3(-1.0, -1.0, 1.0);
    Out = (t / t.z) * dot(t, u) - u;
}