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Examples: Integrate lookAt() into the rotateTowards() demo. #31063

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Merged
merged 1 commit into from
May 9, 2025
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Examples: Integrate lookAt() into the rotateTowards() demo. #31063

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1 change: 0 additions & 1 deletion examples/files.json
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Original file line number Diff line number Diff line change
Expand Up @@ -534,7 +534,6 @@
"misc_exporter_usdz",
"misc_exporter_exr",
"misc_exporter_ktx2",
"misc_lookat",
"misc_raycaster_helper"
],
"css2d": [
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145 changes: 0 additions & 145 deletions examples/misc_lookat.html
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34 changes: 30 additions & 4 deletions examples/webgl_math_orientation_transform.html
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Expand Up @@ -26,13 +26,19 @@

import * as THREE from 'three';

import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

let camera, scene, renderer, mesh, target;

const spherical = new THREE.Spherical();
const rotationMatrix = new THREE.Matrix4();
const targetQuaternion = new THREE.Quaternion();
const clock = new THREE.Clock();
const speed = 2;
const speed = Math.PI / 2;

const params = {
useLookAt: false,
};

init();

Expand Down Expand Up @@ -78,6 +84,13 @@

//

const gui = new GUI();

gui.add( params, 'useLookAt' );
gui.open();

//

generateTarget();

}
Expand All @@ -95,10 +108,23 @@

const delta = clock.getDelta();

if ( ! mesh.quaternion.equals( targetQuaternion ) ) {
if ( mesh.quaternion.equals( targetQuaternion ) === false ) {

if ( params.useLookAt === true ) {

// using lookAt() will make the mesh instantly look at the target

mesh.lookAt( target.position );

} else {

// using rotateTowards() will gradually rotate the mesh towards the target
// the "speed" variable represents the rotation speed in radians per seconds

const step = speed * delta;
mesh.quaternion.rotateTowards( targetQuaternion, step );

const step = speed * delta;
mesh.quaternion.rotateTowards( targetQuaternion, step );
}

}

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