Shader Graph Extras
Released
Editor/UpgradedShaderGraph/Nodes/BaseNodes/Effects.cs
A shader graph node named Fresnel in the editor code. It exposes inputs for Normal, Direction, and Power with a default power, and produces a float Fresnel term by emitting HLSL expression that computes pow(1 - dot(normalize(normal), normalize(direction)), power). It uses vertex/fragment context to choose position-to-camera direction when Direction is not connected.
namespace Editor.ShaderGraphExtras.Nodes;
/// <summary>
/// Calculates a Fresnel term.
/// </summary>
[Title( "Fresnel" ), Category( "Effects" )]
public sealed class Fresnel : ShaderNode
{
/// <summary>
/// Normal at the point being shaded.
/// </summary>
[Input( typeof( Vector3 ) )]
[Hide]
public NodeInput Normal { get; set; }
/// <summary>
/// Direction of the viewer's eye.
/// </summary>
[Input( typeof( Vector3 ) )]
[Hide]
public NodeInput Direction { get; set; }
/// <summary>
/// Power that controls the strength of the Fresnel effect.
/// </summary>
[Input( typeof( float ) )]
[Hide]
public NodeInput Power { get; set; }
/// <summary>
/// Default value for when Power input is missing.
/// </summary>
[InputDefault( nameof( Power ) )]
public float DefaultPower { get; set; } = 10.0f;
[Output( typeof( float ) )]
[Hide]
public NodeResult.Func Result => ( GraphCompiler compiler ) =>
{
var power = compiler.ResultOrDefault( Power, DefaultPower ).Cast( 1 );
var normal = Normal.IsValid ? compiler.Result( Normal ).Cast( 3 ) : "i.vNormalWs";
var direction = Direction.IsValid ? compiler.Result( Direction ).Cast( 3 ) :
$"CalculatePositionToCameraDirWs( {(compiler.IsVs ? "i.vPositionWs.xyz" : "i.vPositionWithOffsetWs.xyz + g_vHighPrecisionLightingOffsetWs.xyz")} )";
return new( 3, $"pow( 1.0 - dot( normalize( {normal} ), normalize( {direction} ) ), {power} )" );
};
}