Utilize THREE.js to control the camera with a button click

Question

Utilize THREE.js to control the camera with a button click

I'm looking to add separate buttons on my website, where each button triggers the camera to move to a different position within the scene. How can I achieve this? Currently, I have set up a system where pressing a button leads to a sequence of predefined camera positions, but I want each button to move the camera independently to specific spots in the scene.

Below is the code snippet I'm currently working with:

camera.position.set(100, 0, 400);

function render() {
    requestAnimationFrame(render);
    renderer.render(scene, camera);
    TWEEN.update();
}

function moveCam() {
    var pos1 = new TWEEN.Tween(camera.position).to({ y: 300 }, 3000).easing(TWEEN.Easing.Quadratic.InOut);
    var pos2 = new TWEEN.Tween(camera.position).to({ x: -400 }, 4000).easing(TWEEN.Easing.Quadratic.InOut);
    var pos3 = new TWEEN.Tween(camera.position).to({ y: -10 }, 4000).easing(TWEEN.Easing.Quadratic.InOut);
    var rot1 = new TWEEN.Tween(camera.rotation).to({ y: -1 }, 4000).easing(TWEEN.Easing.Quadratic.InOut);
    var pos4 = new TWEEN.Tween(camera.position).to({ x: 600 }, 6000).easing(TWEEN.Easing.Quadratic.InOut);
    var pos5 = new TWEEN.Tween(camera.position).to({ y: -400 }, 2000).easing(TWEEN.Easing.Quadratic.InOut);
    var rot2 = new TWEEN.Tween(camera.rotation).to({ y: -5 }, 2000).easing(TWEEN.Easing.Quadratic.InOut);
    var pos6 = new TWEEN.Tween(camera.position).to({ z: 10 }, 5000).easing(TWEEN.Easing.Quadratic.InOut);
    var rot3 = new TWEEN.Tween(camera.rotation).to({ y: 0 }, 2000).easing(TWEEN.Easing.Quadratic.InOut);

    pos1.start();
    pos1.chain(pos2);
    pos2.chain(pos3, rot1)
    rot1.chain(pos4)
    pos4.chain(pos5, rot2)
    rot2.chain(pos6)
    pos6.chain(rot3)

javascript button camera three.js position

Answer 1

Answer №1

Perhaps consider the following approach:

Opt for using a single tween instead of individual tweens for each button. This method ensures that there will not be any interference between them:

var positionTween = new TWEEN.Tween(camera.position)
    .easing(TWEEN.Easing.Quadratic.InOut);
var rotationTween = new TWEEN.Tween(camera.rotation)
    .easing(TWEEN.Easing.Quadratic.InOut);

Make sure to define the positions and rotations for each button comprehensively. It is essential to include all three components when defining a position or rotation value. Omitting a value implies no change, with the camera position depending on its previous state:

In this scenario, the buttons' id attribute is utilized to retrieve the position data. The assumption here is that the HTML structure for the buttons resembles:

<button id="button1" class="camera-button">Position 1</button>

The corresponding JavaScript code would be:

var buttonCameraSettings = {
    button1: {
      position: {x: 1, y: 0, z: 0},
      rotation: {x: 0, y: Math.PI, z: 0}
    },
    button2: {
      // ...
    }
};

You can now set up an event listener for all buttons to retrieve the respective settings:

var button1 = document.getElementById('button1');
button1.addEventListener('click', function(ev) {
  var buttonId = ev.target.id;
  var cameraSettings = buttonCameraSettings[buttonId];

  updateCameraTweens(cameraSettings);
});

For the final step, the updateCameraTweens function should look as follows:

function updateCameraTweens(params) {
  if (params.position) {
    positionTween.stop();
    positionTween.to(params.position, 1000).start();
  }

  if (params.rotation) {
    rotationTween.stop();
    rotationTween.to(params.rotation, 1000).start();
  }
}

If varying durations are required for different animations, simply include those values in the parameters.

It's worth noting that for optimal results, especially with rotations, it is advisable to animate the object's quaternion rather than the Euler angles stored in camera.rotation due to mathematical reasons:

var quatTween = new TWEEN.Tween(camera.quaternion);
var toQuaternion = new THREE.Quaternion();
var toEuler = new THREE.Euler();

// within the updateCameraTweens() function
toEuler.set(rotation.x, rotation.y, rotation.z);
toQuaternion.setFromEuler(toEuler);
quatTween.to(toQuaternion, 1000).start();

Answer 2

Perhaps consider the following approach:

Opt for using a single tween instead of individual tweens for each button. This method ensures that there will not be any interference between them:

var positionTween = new TWEEN.Tween(camera.position)
    .easing(TWEEN.Easing.Quadratic.InOut);
var rotationTween = new TWEEN.Tween(camera.rotation)
    .easing(TWEEN.Easing.Quadratic.InOut);

Make sure to define the positions and rotations for each button comprehensively. It is essential to include all three components when defining a position or rotation value. Omitting a value implies no change, with the camera position depending on its previous state:

In this scenario, the buttons' id attribute is utilized to retrieve the position data. The assumption here is that the HTML structure for the buttons resembles:

<button id="button1" class="camera-button">Position 1</button>

The corresponding JavaScript code would be:

var buttonCameraSettings = {
    button1: {
      position: {x: 1, y: 0, z: 0},
      rotation: {x: 0, y: Math.PI, z: 0}
    },
    button2: {
      // ...
    }
};

You can now set up an event listener for all buttons to retrieve the respective settings:

var button1 = document.getElementById('button1');
button1.addEventListener('click', function(ev) {
  var buttonId = ev.target.id;
  var cameraSettings = buttonCameraSettings[buttonId];

  updateCameraTweens(cameraSettings);
});

For the final step, the updateCameraTweens function should look as follows:

function updateCameraTweens(params) {
  if (params.position) {
    positionTween.stop();
    positionTween.to(params.position, 1000).start();
  }

  if (params.rotation) {
    rotationTween.stop();
    rotationTween.to(params.rotation, 1000).start();
  }
}

If varying durations are required for different animations, simply include those values in the parameters.

It's worth noting that for optimal results, especially with rotations, it is advisable to animate the object's quaternion rather than the Euler angles stored in camera.rotation due to mathematical reasons:

var quatTween = new TWEEN.Tween(camera.quaternion);
var toQuaternion = new THREE.Quaternion();
var toEuler = new THREE.Euler();

// within the updateCameraTweens() function
toEuler.set(rotation.x, rotation.y, rotation.z);
toQuaternion.setFromEuler(toEuler);
quatTween.to(toQuaternion, 1000).start();

Answer 3

Answer №2

If your scene is set to render automatically, you can easily adjust the camera using the following code snippet:

HTML:

<button onclick="panCamera()">Pan</button>

JavaScript:

function panCamera()
{
  camera.position += 10;
}

Answer 4

If your scene is set to render automatically, you can easily adjust the camera using the following code snippet:

HTML:

<button onclick="panCamera()">Pan</button>

JavaScript:

function panCamera()
{
  camera.position += 10;
}

Utilize THREE.js to control the camera with a button click

Answer №1

Answer №2

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