75 lines
2.4 KiB
Markdown
75 lines
2.4 KiB
Markdown
|
# Hue Node
|
||
|
|
|
||
|
|
## Description
|
||
|
|
|
||
|
|
Offsets the hue of input **In** by the amount of input **Offset**. The unit of the offset can be set with the parameter **Range**. **Offset** in **Degrees** is in the range -180 to 180. In **Radians** it is -Pi to Pi.
|
||
|
|
|
||
|
|
## Ports
|
||
|
|
|
||
|
|
| Name | Direction | Type | Binding | Description |
|
||
|
|
|:------------ |:-------------|:-----|:---|:---|
|
||
|
|
| In | Input | Vector 3 | None | Input value |
|
||
|
|
| Offset | Input | Float | None | Amount to offset hue |
|
||
|
|
| Out | Output | Vector 3 | None | Output value |
|
||
|
|
|
||
|
|
## Controls
|
||
|
|
|
||
|
|
| Name | Type | Options | Description |
|
||
|
|
|:------------ |:-------------|:-----|:---|
|
||
|
|
| Range | Dropdown | Degrees, Radians | The unit used for the input **Offset** |
|
||
|
|
|
||
|
|
## Generated Code Example
|
||
|
|
|
||
|
|
The following example code represents one possible outcome of this node per **Base** mode.
|
||
|
|
|
||
|
|
**Degrees**
|
||
|
|
|
||
|
|
```
|
||
|
|
void Unity_Hue_Degrees_float(float3 In, float Offset, out float3 Out)
|
||
|
|
{
|
||
|
|
float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
|
||
|
|
float4 P = lerp(float4(In.bg, K.wz), float4(In.gb, K.xy), step(In.b, In.g));
|
||
|
|
float4 Q = lerp(float4(P.xyw, In.r), float4(In.r, P.yzx), step(P.x, In.r));
|
||
|
|
float D = Q.x - min(Q.w, Q.y);
|
||
|
|
float E = 1e-10;
|
||
|
|
float3 hsv = float3(abs(Q.z + (Q.w - Q.y)/(6.0 * D + E)), D / (Q.x + E), Q.x);
|
||
|
|
|
||
|
|
float hue = hsv.x + Offset / 360;
|
||
|
|
hsv.x = (hue < 0)
|
||
|
|
? hue + 1
|
||
|
|
: (hue > 1)
|
||
|
|
? hue - 1
|
||
|
|
: hue;
|
||
|
|
|
||
|
|
float4 K2 = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
|
||
|
|
float3 P2 = abs(frac(hsv.xxx + K2.xyz) * 6.0 - K2.www);
|
||
|
|
Out = hsv.z * lerp(K2.xxx, saturate(P2 - K2.xxx), hsv.y);
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
**Radians**
|
||
|
|
|
||
|
|
```
|
||
|
|
void Unity_Hue_Radians_float(float3 In, float Offset, out float3 Out)
|
||
|
|
{
|
||
|
|
float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
|
||
|
|
float4 P = lerp(float4(In.bg, K.wz), float4(In.gb, K.xy), step(In.b, In.g));
|
||
|
|
float4 Q = lerp(float4(P.xyw, In.r), float4(In.r, P.yzx), step(P.x, In.r));
|
||
|
|
float D = Q.x - min(Q.w, Q.y);
|
||
|
|
float E = 1e-10;
|
||
|
|
float3 hsv = float3(abs(Q.z + (Q.w - Q.y)/(6.0 * D + E)), D / (Q.x + E), Q.x);
|
||
|
|
|
||
|
|
float hue = hsv.x + Offset;
|
||
|
|
hsv.x = (hue < 0)
|
||
|
|
? hue + 1
|
||
|
|
: (hue > 1)
|
||
|
|
? hue - 1
|
||
|
|
: hue;
|
||
|
|
|
||
|
|
// HSV to RGB
|
||
|
|
float4 K2 = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
|
||
|
|
float3 P2 = abs(frac(hsv.xxx + K2.xyz) * 6.0 - K2.www);
|
||
|
|
Out = hsv.z * lerp(K2.xxx, saturate(P2 - K2.xxx), hsv.y);
|
||
|
|
}
|
||
|
|
```
|