50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
# 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;
|
|
}
|
|
```
|