check camera can see the point

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hi.  I want to check the camera can see the point.  and I caculate the worldviewProject like which is the Vertex shader has.

the code: 

// worldViewProjectionMatrix = world * view * projection

// worldViewProjectionMatrix * vector

var viewport = camera.viewport.toGlobal(engine);
    var cw = viewport.width;
    var ch = viewport.height;
    var cx = viewport.x;
    var cy = viewport.y;
    var viewportMatrix = BABYLON.Vector3._viewportMatrixCache ? BABYLON.Vector3._viewportMatrixCache : (BABYLON.Vector3._viewportMatrixCache = new BABYLON.Matrix());
    BABYLON.Matrix.FromValuesToRef(cw / 2.0, 0, 0, 0, 0, -ch / 2.0, 0, 0, 0, 0, 1, 0, cx + cw / 2.0, ch / 2.0 + cy, 0, 1, viewportMatrix);
    var matrix = BABYLON.Vector3._matrixCache ? BABYLON.Vector3._matrixCache : (BABYLON.Vector3._matrixCache = new BABYLON.Matrix());

   BABYLON.Matrix.Identity().multiplyToRef( viewportMatrix , matrix);
     matrix.multiplyToRef(camera.getProjectionMatrix(), matrix);
     var p2 = BABYLON.Vector3.TransformCoordinates(vector, matrix)

//BABYLON.Vector3.Project(vector, world, transform, viewport) 

var p = BABYLON.Vector3.Project(vector, 
           scene.getTransformMatrix(),   //scene.getTransformMatrix(), 



// p and p2 xy not like




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