two collada object colliding - three.js

Question

I am trying to use Ray intersect to find out if 2 collada object collide.
But so far no success :(
my code http://jsfiddle.net/XqQzF/
object.updateMatrix();
// ray
var f_vector = new THREE.Vector3( 0, 0, -1 );
var b_vector = new THREE.Vector3( 0, 0, 1 );
var l_vector = new THREE.Vector3( -1, 0, 0 );
var r_vector = new THREE.Vector3( 1, 0, 0 );
everytime i use something its removed from the newest three.js revision.
Can you help me on the way ?

Answer 1

I recently update my three.js examples collection to be compatible with the latest version (v56 at time of writing), and this includes an example of collision detection. Check out http://stemkoski.github.com/Three.js/Collision-Detection.html (see http://stemkoski.github.com/Three.js/#collision-detection for instructions).
The main difference in your case will be choosing a central point of your model as an origin point for the rays, and choosing a set of vertices of your model to use as endpoints for the rays, as rays are what is used for collision detection.
Hope this helps!

Answer 2

#Lee Stemkoski answer is ok, when we doesn't use collada data.
First what I know is that we need min. 2 Mesh objects. So I took all Mesh objects from collada object. I wrote two scripts - first tried colliding 2 collada objects. Second tried to collide collada object with wall(simple Mesh). In both cases script it doesn't recognize colliding 😕. So how i should write it?
At last I tried to detect mouse on collada object. It's not about this topic but it's similar problem so I write it here.
Dae file was generated by SketchUp.
Code for two collada objects:
var container;
var meshs = [];
var camera, scene, renderer, raycaster;
var controls;
var mouse = new THREE.Vector2();
var dae, dae2;
var collidableMeshList = [];
var clock = new THREE.Clock();
var keyboard = new THREEx.KeyboardState();
$(document).ready(function() {
init();
animate();
});
function init() {
container = document.createElement('div');
$('.container').append(container);
camera = new THREE.PerspectiveCamera(45, 500 / 500, 1, 1000);
group = new THREE.Group();
scene = new THREE.Scene();
scene.add(camera);
camera.position.set(10 * 10, 12 * 10, 16 * 10);
camera.lookAt(scene.position);
// Lights
group.add(new THREE.AmbientLight(0x777777));
var light = new THREE.DirectionalLight(0xdfebff, 1.25);
light.position.set(300, 400, 50);
light.position.multiplyScalar(1.3);
light.castShadow = true;
group.add(light);
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setClearColor(0xcccccc, 1);
renderer.setSize(500, 500);
container.appendChild(renderer.domElement);
controls = new THREE.OrbitControls(camera, renderer.domElement);
var loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load('./sample.dae', loadDae);
function loadDae(collada) {
dae = collada.scene;
dae.scale.x = 0.5;
dae.scale.y = 0.3;
dae.scale.z = 0.3;
dae.updateMatrix();
group.add(dae);
}
var wallGeometry = new THREE.CubeGeometry(10, 10, 20, 1, 1, 1);
var wallMaterial = new THREE.MeshBasicMaterial({
color: 0x8888ff
});
var wireMaterial = new THREE.MeshBasicMaterial({
color: 0x000000,
wireframe: true
});
loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load('./sample.dae', loadDae2);
function loadDae2(collada) {
dae2 = collada.scene;
dae2.scale.x = 0.5;
dae2.scale.y = 0.3;
dae2.scale.z = 0.3;
dae2.updateMatrix();
dae2.position.set(-40, 0, 0);
dae2.traverse(function(child) {
if (child instanceof THREE.Mesh) {
collidableMeshList.push(child);
}
});
group.add(dae2);
}
group.translateX(-20);
scene.add(group);
raycaster = new THREE.Raycaster();
window.addEventListener('resize', onWindowResize, false);
window.addEventListener('mousemove', onDocumentMouseMove, false);
}
function onDocumentMouseMove(event) {
event.preventDefault();
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function onWindowResize() {
camera.aspect = 500 / 500;
camera.updateProjectionMatrix();
renderer.setSize(500, 500);
}
function update() {
var delta = clock.getDelta();
var moveDistance = 200 * delta;
var rotateAngle = Math.PI / 2 * delta;
if (keyboard.pressed("A"))
dae.rotation.y += rotateAngle;
if (keyboard.pressed("D"))
dae.rotation.y -= rotateAngle;
if (keyboard.pressed("left"))
dae.translateX(-moveDistance);
if (keyboard.pressed("right"))
dae.translateX(moveDistance);
if (keyboard.pressed("up"))
dae.translateZ(-moveDistance);
if (keyboard.pressed("down"))
dae.translateZ(moveDistance);
meshs = [];
if (typeof dae !== 'undefined') {
dae.traverse(function(child) {
if (child instanceof THREE.Mesh) {
meshs.push(child);
}
});
$.each(meshs, function(number_mesh, mesh) {
var originPoint = mesh.position.clone();
for (var vertexIndex = 0; vertexIndex < mesh.geometry.vertices.length; vertexIndex++) {
var localVertex = mesh.geometry.vertices[vertexIndex].clone();
var globalVertex = localVertex.applyMatrix4(mesh.matrix);
var directionVector = globalVertex.sub(mesh.position);
var ray = new THREE.Raycaster(originPoint, directionVector.clone().normalize());
var collisionResults = ray.intersectObjects(collidableMeshList);
if (collisionResults.length > 0 && collisionResults[0].distance < directionVector.length()) {
console.log(" Hit ");
}
}
});
}
controls.update();
}
function animate() {
requestAnimationFrame(animate);
render();
update();
}
function render() {
renderer.render(scene, camera);
}
Code for collada + wall(Mesh):
var container;
var meshs = [];
var camera, scene, renderer, raycaster;
var controls;
var mouse = new THREE.Vector2();
var dae;
var collidableMeshList = [];
var clock = new THREE.Clock();
var keyboard = new THREEx.KeyboardState();
$(document).ready(function() {
init();
animate();
});
function init() {
container = document.createElement('div');
$('.container').append(container);
camera = new THREE.PerspectiveCamera(45, 500 / 500, 1, 1000);
group = new THREE.Group();
scene = new THREE.Scene();
scene.add(camera);
camera.position.set(10 * 10, 12 * 10, 16 * 10);
camera.lookAt(scene.position);
// Lights
group.add(new THREE.AmbientLight(0x777777));
var light = new THREE.DirectionalLight(0xdfebff, 1.25);
light.position.set(300, 400, 50);
light.position.multiplyScalar(1.3);
light.castShadow = true;
group.add(light);
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setClearColor(0xcccccc, 1);
renderer.setSize(500, 500);
container.appendChild(renderer.domElement);
controls = new THREE.OrbitControls(camera, renderer.domElement);
var loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load('./sample.dae', loadDae);
function loadDae(collada) {
dae = collada.scene;
dae.scale.x = 0.5;
dae.scale.y = 0.3;
dae.scale.z = 0.3;
dae.updateMatrix();
group.add(dae);
}
var wallGeometry = new THREE.CubeGeometry(10, 10, 20, 1, 1, 1);
var wallMaterial = new THREE.MeshBasicMaterial({
color: 0x8888ff
});
var wireMaterial = new THREE.MeshBasicMaterial({
color: 0x000000,
wireframe: true
});
var wall = new THREE.Mesh(wallGeometry, wallMaterial);
wall.position.set(-40, 5, -10);
group.add(wall);
collidableMeshList.push(wall);
var wall = new THREE.Mesh(wallGeometry, wireMaterial);
wall.position.set(-40, 5, -10);
group.add(wall);
group.translateX(-20);
scene.add(group);
raycaster = new THREE.Raycaster();
window.addEventListener('resize', onWindowResize, false);
window.addEventListener('mousemove', onDocumentMouseMove, false);
}
function onDocumentMouseMove(event) {
event.preventDefault();
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function onWindowResize() {
camera.aspect = 500 / 500;
camera.updateProjectionMatrix();
renderer.setSize(500, 500);
}
function update() {
var delta = clock.getDelta();
var moveDistance = 200 * delta;
var rotateAngle = Math.PI / 2 * delta;
if (keyboard.pressed("A"))
dae.rotation.y += rotateAngle;
if (keyboard.pressed("D"))
dae.rotation.y -= rotateAngle;
if (keyboard.pressed("left"))
dae.translateX(-moveDistance);
if (keyboard.pressed("right"))
dae.translateX(moveDistance);
if (keyboard.pressed("up"))
dae.translateZ(-moveDistance);
if (keyboard.pressed("down"))
dae.translateZ(moveDistance);
meshs = [];
if (typeof dae !== 'undefined') {
dae.traverse(function(child) {
if (child instanceof THREE.Mesh) {
meshs.push(child);
}
});
$.each(meshs, function(number_mesh, mesh) {
var originPoint = mesh.position.clone();
for (var vertexIndex = 0; vertexIndex < mesh.geometry.vertices.length; vertexIndex++) {
var localVertex = mesh.geometry.vertices[vertexIndex].clone();
var globalVertex = localVertex.applyMatrix4(mesh.matrix);
var directionVector = globalVertex.sub(mesh.position);
var ray = new THREE.Raycaster(originPoint, directionVector.clone().normalize());
var collisionResults = ray.intersectObjects(collidableMeshList);
if (collisionResults.length > 0 && collisionResults[0].distance < directionVector.length()) {
console.log(" Hit ");
}
}
});
}
controls.update();
}
function animate() {
requestAnimationFrame(animate);
render();
update();
}
function render() {
renderer.render(scene, camera);
}
Detect mouse on collada object. Short code version:
var meshs = [],
raycaster,
mouse = new THREE.Vector2();
...
function init() {
...
function loadDae(collada) {
dae = collada.scene;
dae.scale.x = 0.5;
dae.scale.y = 0.3;
dae.scale.z = 0.3;
dae.updateMatrix();
group.add(dae);
dae.traverse(function(child) {
if (child instanceof THREE.Mesh) {
meshs.push(child);
}
});
}
var loader = new THREE.ColladaLoader();
loader.options.convertUpAxis = true;
loader.load('./sample.dae', loadDae);
raycaster = new THREE.Raycaster();
window.addEventListener('mousemove', onDocumentMouseMove, false);
...
}
...
function onDocumentMouseMove(event) {
event.preventDefault();
mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
}
function render() {
raycaster.setFromCamera(mouse, camera);
if (group.children.length === 5) {
var intersects = raycaster.intersectObjects(meshs);
if (intersects.length > 0) {
console.log(" Hit ");
}
}
renderer.render(scene, camera);
}
...
General - yes, it works, but throw errors with some $meshs 😕.
TypeError: undefined is not an object (evaluating 'O')
three.min.js:8304
cthree.min.js:3544
intersectObjectsthree.min.js:3609:144
Why and how to recognize which mesh is correct for intersectObjects and which not?