qt-everywhere-src-5.15.1/qtquick3d/src/imports/effectlib/DistortionSphere.qml

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import QtQuick 2.15
import QtQuick3D 1.15
import QtQuick3D.Effects 1.15

Effect {
    property real radius: 0.25          // 0 - 1
    property real distortionHeight: 0.5 // -1 - 1
    property vector2d center: Qt.vector2d(0.5, 0.5)

    Shader {
        id: distortionVert
        stage: Shader.Vertex
        shader: "shaders/distortion.vert"
    }

    Shader {
        id: distortionFrag
        stage: Shader.Fragment
        shader: "shaders/distortionsphere.frag"
    }

    passes: [
        Pass {
            shaders: [ distortionVert, distortionFrag ]
        }
    ]
}