I have successfully imported a 3D terrain using Blender and the OBJLoader in Three.js. In addition, I have created a mesh (highlighted in yellow in the image below) that I want to follow the mouse cursor while it hovers over the terrain. I have attempted to use the raycaster method, but I'm unsure of how to implement it on my .obj file as it appears that I cannot access it outside of the loader.
Any suggestions on how I can make the yellow mesh follow the terrain (loaded .obj) in response to mouse movement?
As a beginner in Three.js, I would appreciate any guidance...
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 10000 );
var renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
camera.position.z = 150;
camera.position.y=300;
camera.position.x=350;
var light = new THREE.HemisphereLight( 0xffffbb, 0x080820, 1 );
scene.add( light );
var controls= new THREE.OrbitControls(camera,renderer.domElement);
controls.enableDamping=true;
controls.campingFactor=0.25;
controls.enableZoom=true;
controls.minDistance= 1;
controls.maxDistance=3000;
controls.minPolarAngle= -Math.PI/2;
controls.maxPolarAngle= Math.PI/2;
var terrain;
var mtlLoader = new THREE.MTLLoader();
mtlLoader.load('models/terrain.mtl',
(materials) => {
materials.preload();
var loader = new THREE.OBJLoader();
loader.setMaterials(materials);
loader.load(
'models/terrain.obj',
function ( object ) {
terrain = object;
scene.add( terrain );
});
}
);
var Cylindergeometry = new THREE.CylinderGeometry( 5, 0, 8, 32 );
var material = new THREE.MeshBasicMaterial( {color: 0xffff00} );
var cylinder = new THREE.Mesh( Cylindergeometry, material );
var Torusgeometry = new THREE.TorusGeometry( 7, 0.5, 8, 6);
var material = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
var torus = new THREE.Mesh( Torusgeometry, material);
Torusgeometry.rotateX(1.5708);
Torusgeometry.translate(0,-4.5,0);
//Merge the two parts to make it one mesh (yellow pivot)
var PivotGeometry = new THREE.Geometry();
PivotGeometry.merge(Cylindergeometry);
PivotGeometry.merge(Torusgeometry);
var pivot = new THREE.Mesh(PivotGeometry, material);
scene.add(pivot);
// Attempting to Raycast the terrain to make the pivot follow the mouse when it's on the terrain
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
function onMouseMove( event ) {
mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
raycaster.setFromCamera( mouse, camera );
// Check if the ray from the camera hits one of our meshes
var intersects = raycaster.intersectObject( terrain,true );
// Update position and rotation of the pivot based on mouse movement
if ( intersects.length > 0 ) {
pivot.position.set( 0, 0, 0 );
pivot.lookAt( intersects[ 0 ].face.normal );
pivot.position.copy( intersects[ 0 ].point );
}
}
// Update the scene display
var animate = function () {
requestAnimationFrame( animate );
renderer.render( scene, camera );
};
animate();