var material=pickedFeature.mesh.materials[0];//.u_baseColorFactor
material.setValue('baseColorFactor', new Cesium.Cartesian4(1.0, 0.0, 0.0, 1.0));
var material=pickedFeature.mesh.materials[0];//.u_baseColorFactor
material.setValue('baseColorFactor', new Cesium.Cartesian4(1.0, 0.0, 0.0, 1.0));