31 lines
1.3 KiB
Markdown
31 lines
1.3 KiB
Markdown
|
# Twirl Node
|
||
|
|
|
||
|
|
## Description
|
||
|
|
|
||
|
|
Applies a twirl warping effect similar to a black hole to the value of input **UV**. The center reference point of the warping effect is defined by input **Center** and the overall strength of the effect is defined by the value of input **Strength**. Input **Offset** can be used to offset the individual channels of the result.
|
||
|
|
|
||
|
|
## Ports
|
||
|
|
|
||
|
|
| Name | Direction | Type | Binding | Description |
|
||
|
|
|:------------ |:-------------|:-----|:---|:---|
|
||
|
|
| UV | Input | Vector 2 | UV | Input UV value |
|
||
|
|
| Center | Input | Vector 2 | None | Center reference point |
|
||
|
|
| Strength | Input | Float | None | Strength of the effect |
|
||
|
|
| Offset | Input | Vector 2 | None | Individual channel offsets |
|
||
|
|
| Out | Output | Vector 2 | None | Output UV value |
|
||
|
|
|
||
|
|
## Generated Code Example
|
||
|
|
|
||
|
|
The following example code represents one possible outcome of this node.
|
||
|
|
|
||
|
|
```
|
||
|
|
void Unity_Twirl_float(float2 UV, float2 Center, float Strength, float2 Offset, out float2 Out)
|
||
|
|
{
|
||
|
|
float2 delta = UV - Center;
|
||
|
|
float angle = Strength * length(delta);
|
||
|
|
float x = cos(angle) * delta.x - sin(angle) * delta.y;
|
||
|
|
float y = sin(angle) * delta.x + cos(angle) * delta.y;
|
||
|
|
Out = float2(x + Center.x + Offset.x, y + Center.y + Offset.y);
|
||
|
|
}
|
||
|
|
```
|