How to use the @babylonjs/core/Maths/math.Color3 function in @babylonjs/core

function getHighlightMesh(rendering) {
    var m = rendering._highlightMesh
    if (!m) {
        var mesh = Mesh.CreatePlane("highlight", 1.0, rendering._scene)
        var hlm = rendering.makeStandardMaterial('highlightMat')
        hlm.backFaceCulling = false
        hlm.emissiveColor = new Color3(1, 1, 1)
        hlm.alpha = 0.2
        mesh.material = hlm
        m = rendering._highlightMesh = mesh
        // outline
        var s = 0.5
        var lines = Mesh.CreateLines("hightlightLines", [
            new Vector3(s, s, 0),
            new Vector3(s, -s, 0),
            new Vector3(-s, -s, 0),
            new Vector3(-s, s, 0),
            new Vector3(s, s, 0)
        ], rendering._scene)
        lines.color = new Color3(1, 1, 1)
        lines.parent = mesh

        rendering.addMeshToScene(m)

applyPropertyWhenDefined(prop.vectorProperties._EmissionColor, (value) => {
            material.emissiveColor = new Color3(value[0], value[1], value[2]);
        });
        applyPropertyWhenDefined(prop.floatProperties._OutlineWidth, (value) => material.outlineWidth = value);

applyPropertyWhenDefined(prop.vectorProperties._OutlineColor, (value) => {
            material.outlineColor = new Color3(value[0], value[1], value[2]);
        });
        applyPropertyWhenDefined(prop.floatProperties._OutlineLightingMix, (value) => material.outlineLightingMix = value);

    function arrToColor(a) { return new Color3(a[0], a[1], a[2]) }
    scene.clearColor = arrToColor(opts.clearColor)

applyPropertyWhenDefined(prop.vectorProperties._ShadeColor, (value) => {
            material.shadeColor = new Color3(value[0], value[1], value[2]);
        });
        applyPropertyWhenDefined(prop.floatProperties._BumpScale, (value) => material.bumpScale = value);

.add('Drag and Drop', () => (
    
      

applyPropertyWhenDefined(prop.vectorProperties._RimColor, (value) => {
            material.rimColor = new Color3(value[0], value[1], value[2]);
        });
        applyPropertyWhenDefined(prop.floatProperties._RimLightingMix, (value) => material.rimLightingMix = value);

.add('Drag and Drop', () => (
    
      
        

        

        
          
        

        
          
        

        
          
        

        
          
        

        
          
        
      
    
  ))