[JAVA3D] why is mycanvas3d.getPhysicalHeight()returning 0.0

[Mohammed Akacem]

I have only one 3dcanvas attached to my View object.
why I am get 0.0 from mycanvas.getPhysicalHeight();

System.out.println("height=" +
cam.getview().getCanvas3D(0).getPhysicalHeight());
    System.out.println("\n"+" width="+
cam.getview().getCanvas3D(0).getPhysicalWidth());

any hint?

thanks
Mohammed

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