How to get the height of the camera from the ground

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How to get the height of the camera from the ground

2

The simplest way:

let heightFromCameraToGround = camera.position.y - ground.position.y

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or otherwise in the case of a terrain generated with a heightmap :

const y = ground.getHeightAtCoordinates(camera.position.x, camera.position.z);
const heightFromCameraToGround = camera.position.y - y;

if the terrain is hilly, this will retrieve the distance Y between the camera and the terrain relative to the position of the camera

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