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Moving FreeCamera in z axis


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I have a requirement to move a free camera in z axis. As I have not found any out-of-the box key mapping for that, I tried to write my own as shown below.

BABYLON.FreeCamera.keysUpz = [];BABYLON.FreeCamera.keysDownz = [];..........    window.addEventListener("keydown", function(event) {        var keyCode = event.keyCode;        if (camera.keysUpz.indexOf(keyCode) > -1) {            console.log("Going up");            //camera.position.z += 0.05;            //camera.position.addInPlace(new Vec3(0, 0, 0.05));        }        else if (camera.keysDownz.indexOf(keyCode) > -1) {            console.log("Going down");            //camera.position.z -= 0.05;            //camera.position.addInPlace(new Vec3(0, 0, -0.05));        }    });

I have tried two ways to do that: 1. using position.z and 2. position.addInPlace(new Vec3(0, 0, z))


However, the translation of the camera is not smooth as in default movement of the camera.


What I can do to achieve the same?

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