40 lines
1.9 KiB
Markdown
40 lines
1.9 KiB
Markdown
# Normal From Texture Node
|
|
|
|
## Description
|
|
|
|
Converts a height map defined by input **Texture** into a normal map. UV values and sampler state can be defined by inputs **UV** and **Sampler** respectively. If nothing is connected to these ports they will use default values from the inputs. See [Port Bindings](Port-Bindings.md) for more information.
|
|
|
|
The strength of the created normal map can be defined by inputs **Offset** and **Strength**, where **Offset** defines the maximum distance of a normal detail and **Strength** acts as a multiplier to the result.
|
|
|
|
If you experience texture sampling errors while using this node in a graph which includes Custom Function Nodes or Sub Graphs, you can resolve them by upgrading to version 10.3 or later.
|
|
|
|
## Ports
|
|
|
|
| Name | Direction | Type | Binding | Description |
|
|
|:------------ |:-------------|:-----|:---|:---|
|
|
| Texture | Input | Texture | None | Height map |
|
|
| UV | Input | Vector 2 | UV | Texture coordinates |
|
|
| Sampler | Input | Sampler State | None | Sampler for **Texture** |
|
|
| Offset | Input | Float | None | Amount to offset samples |
|
|
| Strength | Input | Float | None | Strength multiplier |
|
|
| Out | Output | Vector 3 | None | Output value |
|
|
|
|
## Generated Code Example
|
|
|
|
The following example code represents one possible outcome of this node.
|
|
|
|
```
|
|
void Unity_NormalFromTexture_float(Texture texture, SamplerState Sampler, float2 UV, float Offset, float Strength, out float3 Out)
|
|
{
|
|
Offset = pow(Offset, 3) * 0.1;
|
|
float2 offsetU = float2(UV.x + Offset, UV.y);
|
|
float2 offsetV = float2(UV.x, UV.y + Offset);
|
|
float normalSample = Texture.Sample(Sampler, UV);
|
|
float uSample = Texture.Sample(Sampler, offsetU);
|
|
float vSample = Texture.Sample(Sampler, offsetV);
|
|
float3 va = float3(1, 0, (uSample - normalSample) * Strength);
|
|
float3 vb = float3(0, 1, (vSample - normalSample) * Strength);
|
|
Out = normalize(cross(va, vb));
|
|
}
|
|
```
|