50 lines
2.0 KiB
Markdown
50 lines
2.0 KiB
Markdown
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# Normal Blend Node
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## Description
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Blends two normal maps defined by inputs **A** and **B**, normalizing the result to produce a valid normal map representing the combined surface detail.
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## Ports
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| Name | Direction | Type | Binding | Description |
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|:-----|:----------|:---------|:--------|:------------------------|
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| A | Input | Vector 3 | None | First input normal map |
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| B | Input | Vector 3 | None | Second input normal map |
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| Out | Output | Vector 3 | None | Blended normal map |
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## Controls
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| Name | Type | Options | Description |
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|:-----|:---------|:-----------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| 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. |
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| Mode | Dropdown | Reoriented | Blends the two normal maps using a mathematically correct method, ensuring the resulting normal map represents a realistic combined surface. |
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## Generated Code Example
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The following example code demonstrates how the node blends normals in each **Mode**:
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**Default**
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Adds the x and y components (R and G channels) of the input normals, multiplies the z components (B channel), then normalizes the result.
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```
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void Unity_NormalBlend_float(float3 A, float3 B, out float3 Out)
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{
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Out = normalize(float3(A.rg + B.rg, A.b * B.b));
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}
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```
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**Reoriented**
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Blends the input normals using a reoriented method that makes the resulting surface normal look realistic.
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```
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void Unity_NormalBlend_Reoriented_float(float3 A, float3 B, out float3 Out)
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{
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float3 t = A.xyz + float3(0.0, 0.0, 1.0);
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float3 u = B.xyz * float3(-1.0, -1.0, 1.0);
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Out = (t / t.z) * dot(t, u) - u;
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}
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```
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