Effortlessly zoom the camera onto the object's position with a click of the mouse

Within my scene, I have several boxes and a PerspectiveCamera.

My goal is to create a specific effect that triggers when I click on one of the boxes:

  • The camera smoothly transitions from its current position to focus on the selected box
  • The selected box becomes centered in the camera's viewport
  • The camera then zooms in and highlights the selected box

I drew inspiration for this effect from 100,000 Stars. In this project, clicking on a star would trigger the camera to zoom in on it and display it at the center of the view. My aim is to replicate this captivating effect.

Currently, I can retrieve the position of the selected box and look at it. However, I am eager to enhance this interaction further but uncertain about the next steps to take.

javascriptthree.js

Answer №1

To achieve the desired effect, consider implementing an animation. There are several animation libraries available such as bounce.js and tweenmax.js. Utilizing the position data you have obtained from translation, create a smooth animation for seamless transitions. Below is a sample code snippet using tweenmax.js:

var tween = new TweenMax(camera.position)
                .to({
                    x : destination.position.x,
                    y : destination.position.y,
                    z : destination.position.z
                }, 1200)
                .easing(TweenMax.Easing.Linear.None)
                .start();

If centering the box in your camera view is the goal, adjusting the camera rotation is necessary. Calculate the target rotation matrix as shown below:

    var rotationMatrix = new Three.Matrix4();
    rotationMatrix.lookAt(destination_position,destination_box.position,camera.up);
    var targetRotation = new Three.Euler(0,0,0,"XYZ");
    targetRotation.setFromRotationMatrix(rotationMatrix);
    //targetRotation now reflects the updated rotation after translation.

You can then animate the rotation change using a similar approach.

Additionally, it appears that they switch cameras at the end of the scene in 100000 stars.

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