35 lines
1.5 KiB
Markdown
35 lines
1.5 KiB
Markdown
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# Fade Transition Node
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## Description
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Fade Transition is a method of adding noise to add variation while a function transitions from on to off. This node takes in a fade value and remaps it using the noise value (usually from a texture). When FadeValue is 0, the output is always 0, and when FadeValue is 1, the output is always exactly 1. In between 0 and 1 the transition will follow the pattern in the noise.
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This [Node](Node.md) is commonly used as an input to **Alpha** on a [Master Node](Master-Node.md) to provide an LOD transition.
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## Ports
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| Name | Direction | Type | Binding | Description |
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|:------------ |:-------------|:-----|:---|:---|
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| Texture | Input | Texture 2D | None | Input value |
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| Noise | Input | Float | None | The noise variation to apply to the fade function |
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| FadeValue | Input | Float | None | The amount of transition to apply |
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| FadeContrast | Input | Float | None | The contrast at which a single pixel goes from fully transparent to fully opaque. Higher values cause sharper edges in the transition |
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| Fade | Output | Float | None | The resulting fade value |
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## Generated Code Example
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The following example code represents one possible outcome of this node.
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```
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float Unity_FadeTransitionNode_ApplyFade_float(float noise, float fadeValue, float fadeContrast)
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{
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float ret = saturate(fadeValue*(fadeContrast+1)+(noise-1)*fadeContrast);
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return ret;
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}
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float Result = Unity_FadeTransitionNode_ApplyFade_float(
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_NoiseValue,
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_FadeValue,
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_FadeContrast);
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```
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