Firstborn/Library/PackageCache/com.unity.shadergraph@12.1.11/Documentation~/Blackbody-Node.md
Schaken-Mods 9092858a58 updated to the latest editor
I updated everything to the latest Unity Editor. Also realized I had the wrong shaders on my hairs, those are fixed and the hairs look MUCH better!
2023-05-07 17:43:11 -05:00

1.3 KiB

Blackbody Node

Description

Samples a Gradient that simulates the effect of black body radiation. The calculations in this node are based on data gathered by Mitchell Charity. This node outputs color in linear RGB space and preforms the conversion using a D65 whitepoint and a CIE 1964 10 degree color space. For more information, see What color is a blackbody?

Ports

Name Direction Type Binding Description
Temperature Input Float None Temperature or temperature map in Kelvin to sample.
Out Output Vector 3 None Intensity represented by color in Vector 3.

Generated Code Example

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

void Unity_Blackbody_float(float Temperature, out float3 Out)
{
    float3 color = float3(255.0, 255.0, 255.0);
    color.x = 56100000. * pow(Temperature,(-3.0 / 2.0)) + 148.0;
    color.y = 100.04 * log(Temperature) - 623.6;
    if (Temperature > 6500.0) color.y = 35200000.0 * pow(Temperature,(-3.0 / 2.0)) + 184.0;
    color.z = 194.18 * log(Temperature) - 1448.6;
    color = clamp(color, 0.0, 255.0)/255.0;
    if (Temperature < 1000.0) color *= Temperature/1000.0;
    Out = color;
}