Guidelines for adjusting the camera angle while moving the camera

Question

Guidelines for adjusting the camera angle while moving the camera

Recently, I created a basic threeJS 3D application that allows users to navigate and move using four directional keys. However, there seems to be an issue where the movement is consistent regardless of where you are looking. This behavior can be attributed to the code snippet below:

camera.position.x += 0.1

javascript three.js

Answer 1

Answer №1

To implement movement in different directions using the arrow keys, you will need to set a default displacement vector of (0.1, 0, 0) as a Vector3. This vector should then have the camera's rotation (quaternion) applied to it before being added to the camera's position. Below is an example of the code:

// Create the camera
var camera = new THREE.PerspectiveCamera();

// Create a reusable displacement vector
var dispVector = new THREE.Vector3();

function onRightKey() {
    dispVector.set(0.1, 0, 0); // Moving right by 0.1 on the x-axis
    applyDisplacement();
}

function applyDisplacement() {
    // Applying the camera's rotation to the displacement vector
    dispVector.applyQuaternion(camera.quaternion);

    // Updating the camera position with the resulting displacement vector
    camera.position.add(dispVector);
}

This concept can be extended to other directional keys as well. For instance, using (-0.1, 0, 0) for moving left or (0, 0.1, 0) for moving up. Here's how you can do it:

function onLeftKey() {
    dispVector.set(-0.1, 0, 0); // Moving left by -0.1 on the x-axis
    applyDisplacement();
}

function onUpKey() {
    dispVector.set(0, 0.1, 0); // Moving up by 0.1 on the y-axis
    applyDisplacement();
}

Answer 2

To implement movement in different directions using the arrow keys, you will need to set a default displacement vector of (0.1, 0, 0) as a Vector3. This vector should then have the camera's rotation (quaternion) applied to it before being added to the camera's position. Below is an example of the code:

// Create the camera
var camera = new THREE.PerspectiveCamera();

// Create a reusable displacement vector
var dispVector = new THREE.Vector3();

function onRightKey() {
    dispVector.set(0.1, 0, 0); // Moving right by 0.1 on the x-axis
    applyDisplacement();
}

function applyDisplacement() {
    // Applying the camera's rotation to the displacement vector
    dispVector.applyQuaternion(camera.quaternion);

    // Updating the camera position with the resulting displacement vector
    camera.position.add(dispVector);
}

This concept can be extended to other directional keys as well. For instance, using (-0.1, 0, 0) for moving left or (0, 0.1, 0) for moving up. Here's how you can do it:

function onLeftKey() {
    dispVector.set(-0.1, 0, 0); // Moving left by -0.1 on the x-axis
    applyDisplacement();
}

function onUpKey() {
    dispVector.set(0, 0.1, 0); // Moving up by 0.1 on the y-axis
    applyDisplacement();
}

Guidelines for adjusting the camera angle while moving the camera

Answer №1

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