Cesium Cartesian3 move vertically up

Question

I want to move a Cartesian3 position vertically up by x amount of units (e.g., meters).

I DON'T want to convert it to Cartographic, add x to the altitude and covert back to Cartesian3.

What would be the best way (performance-wise) to do this operation?

Answer 1

Super easy.

    const position = Cesium.Cartesian3.fromDegrees(129.507780, 42.9075, 0);
    const origMagnitude = Cesium.Cartesian3.magnitude(position);
    const verticalAmount = 10;
    const newMagnitude = origMagnitude + verticalAmount;
    const scalar = newMagnitude / origMagnitude;

    const newPosition = new Cesium.Cartesian3();
    Cesium.Cartesian3.multiplyByScalar(position, scalar, newPosition);

Here's Sandcastle link