Variable grainConst

grain: MultipassFilter<
    {
        amount: {
            default: 0.3;
            description: "How strong the grain is.";
            label: "Amount";
            max: 1;
            min: 0;
            step: 0.01;
            type: "float";
        };
        seed: {
            default: 0;
            description: "Changes the grain pattern without changing its look.";
            label: "Seed";
            max: 999;
            min: 0;
            type: "int";
        };
        size: {
            default: 1.5;
            description: "Size of the grain in pixels.";
            label: "Size";
            max: 8;
            min: 1;
            step: 0.1;
            type: "float";
            unit: "px";
        };
    },
> = ...