HX-PGS-AIM-IOS/Library/PackageCache/com.unity.shadergraph/Documentation~/Sample-Gradient-Node.md

Sample Gradient Node

Description

Samples a Gradient given the input of Time. Returns a Vector 4 color value for use in the shader.

Ports

Name	Direction	Type	Binding	Description
Gradient	Input	Gradient	None	Gradient to sample
Time	Input	Float	None	Point at which to sample gradient (0.0–1.0)
Out	Output	Vector 4	None	Output value as Vector4

Generated Code Example

The following example code represents one possible outcome of this node.

void Unity_SampleGradient_float(float4 Gradient, float Time, out float4 Out)
{
    float3 color = Gradient.colors[0].rgb;
    [unroll]
    for (int c = 1; c < 8; c++)
    {
        float colorPos = saturate((Time - Gradient.colors[c-1].w) / (Gradient.colors[c].w - Gradient.colors[c-1].w)) * step(c, Gradient.colorsLength-1);
        color = lerp(color, Gradient.colors[c].rgb, lerp(colorPos, step(0.01, colorPos), Gradient.type));
    }
#ifndef UNITY_COLORSPACE_GAMMA
    color = SRGBToLinear(color);
#endif
    float alpha = Gradient.alphas[0].x;
    [unroll]
    for (int a = 1; a < 8; a++)
    {
        float alphaPos = saturate((Time - Gradient.alphas[a-1].y) / (Gradient.alphas[a].y - Gradient.alphas[a-1].y)) * step(a, Gradient.alphasLength-1);
        alpha = lerp(alpha, Gradient.alphas[a].x, lerp(alphaPos, step(0.01, alphaPos), Gradient.type));
    }
    Out = float4(color, alpha);
}