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3d to 2d err

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var p = BABYLON.Vector3.Project(vector, 

it's return P { x: NaN , y: NaN}

camera.viewport.toGlobal(engine) is null 

e {x: NaN, y: NaN, width: NaN, height: NaN}

i find google and the result page is return the NaN too.


I use it this function last month, and it worked. 

but now didn't work. 

I don't konw why?



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