Variable vignetteConst

vignette: MultipassFilter<
    {
        amount: {
            default: -0.4;
            description: "Negative darkens the edges, positive lightens them.";
            label: "Amount";
            max: 1;
            min: -1;
            step: 0.01;
            type: "float";
        };
        feather: {
            default: 0.5;
            description: "How gradually the effect fades in; larger is softer.";
            label: "Feather";
            max: 1;
            min: 0.05;
            step: 0.01;
            type: "float";
        };
        midpoint: {
            default: 0.4;
            description: "How far from the centre the effect starts (the corners are 1).";
            label: "Midpoint";
            max: 1;
            min: 0;
            step: 0.01;
            type: "float";
        };
        roundness: {
            default: 0;
            description: "0 follows the shape of the picture; 1 makes the vignette a circle.";
            label: "Roundness";
            max: 1;
            min: 0;
            step: 0.01;
            type: "float";
        };
    },
> = ...