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# DDXY Node
## Description
Returns the sum of both partial derivatives of input **In**, with respect to the screen-space x-coordinate and screen-space y-coordinate respectively. This node can only be used in the pixel shader stage.
## Ports
| Name | Direction | Type | Description |
|:------------ |:-------------|:-----|:---|
| In | Input | Dynamic Vector | Input value |
| Out | Output | Dynamic Vector | Output partial derivative value |
## Generated Code Example
The following example code represents one possible outcome of this node.
```
void Unity_DDXY_float4(float4 In, out float4 Out)
{
Out = ddxy(In);
}
```