BasePostProcess: Custom Post-Processing with GetWeighted, BlitMode, and PostProcessVolume Blending

public class MyColorGrade : BasePostProcess<MyColorGrade>, Component.ExecuteInEditor
{
    [Property] public Color Tint { get; set; } = Color.White;
    [Property, Range( 0, 1 )] public float Saturation { get; set; } = 1.0f;

    Material _material;

    public override void Render()
    {
        _material ??= Material.Load( "materials/postprocess/my_grade.vmat" );

        Attributes.Set( "g_flSaturation", GetWeighted( x => x.Saturation, 1.0f ) );
        Attributes.Set( "g_vTint", GetWeighted( x => x.Tint, Color.White ) );

        Blit( BlitMode.Simple( _material, Rendering.Stage.AfterPostProcess, 100 ), "MyColorGrade" );
    }
}

// Blend a float across all volumes
float saturation = GetWeighted( x => x.Saturation, defaultVal: 1.0f );

// Blend a Color
Color tint = GetWeighted( x => x.Tint, Color.White );

// Only lerp between volumes (don't lerp from default)
float value = GetWeighted( x => x.Value, 0f, onlyLerpBetweenVolumes: true );

// Simple blit at a render stage
Blit( BlitMode.Simple( material, Stage.AfterPostProcess, order: 100 ), "DebugName" );

// Blit with backbuffer copy (for effects that read the current frame)
Blit( BlitMode.WithBackbuffer( material, Stage.AfterPostProcess, order: 100 ), "DebugName" );

// Blit with backbuffer + mipmaps (for blurry reflections etc)
Blit( BlitMode.WithBackbuffer( material, Stage.AfterPostProcess, order: 100, mip: true ), "DebugName" );

Rendering.Stage.AfterPostProcess  // after all built-in post-process
Rendering.Stage.AfterTransparent  // after transparent objects
Rendering.Stage.AfterUI           // after UI rendering

// PostProcessVolume properties
volume.Priority = 0;          // higher priority overrides lower
volume.BlendWeight = 1.0f;    // [0..1] overall weight
volume.BlendDistance = 50f;   // blend distance from volume edge