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hand-model-leap-motion.html
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hand-model-leap-motion.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Basic Example - Hand Tracking</title>
<style>
body { margin: 0; }
canvas { display: block; }
</style>
</head>
<body>
<script src="js/three.js"></script>
<script type="module">
import {VRButton} from './js/VRButton.js';
// init scene with background
var scene = new THREE.Scene();
scene.background = new THREE.Color( 0x808080 );
// init camera
var camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 0.1, 1000 );
camera.position.y = 0.5;
// init renderer
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
var xrRefSpace;
let boxes_left = [];
let bones_left = [];
let boxes_right = [];
let bones_right = [];
// skeleton for hands
let boxes = { left: boxes_left, right: boxes_right, leftBones: bones_left, rightBones: bones_right};
let jointConnections = [
{startJoint: 2, endJoint: 3},
{startJoint: 3, endJoint: 4},
{startJoint: 6, endJoint: 7},
{startJoint: 7, endJoint: 8},
{startJoint: 8, endJoint: 9},
{startJoint: 11, endJoint: 12},
{startJoint: 12, endJoint: 13},
{startJoint: 13, endJoint: 14},
{startJoint: 16, endJoint: 17},
{startJoint: 17, endJoint: 18},
{startJoint: 18, endJoint: 19},
{startJoint: 21, endJoint: 22},
{startJoint: 22, endJoint: 23},
{startJoint: 23, endJoint: 24},
{startJoint: 6, endJoint: 11},
{startJoint: 11, endJoint: 16},
{startJoint: 16, endJoint: 21},
{startJoint: 0, endJoint: 1},
{startJoint: 0, endJoint: 20},
{startJoint: 1, endJoint: 2},
{startJoint: 1, endJoint: 6},
{startJoint: 20, endJoint: 1},
{startJoint: 20, endJoint: 21},
];
function addBox(x, y, z, box_list, offset) {
var geometry = new THREE.SphereGeometry(1, 16, 16);
var material = new THREE.MeshStandardMaterial( {
color: 0xeeeeee,
roughness: 0.8,
metalness: 0.4
});
material.color.setRGB(0, 0.1, 1.0);
var cube = new THREE.Mesh( geometry, material );
cube.castShadow = true;
box_list.push({
mesh: cube,
position: [x, y, z],
offset: offset
});
}
function addBone(startJoint, endJoint, box_list) {
var cylindergeometry = new THREE.CylinderGeometry( 0.005, 0.005, 0.1, 16 );
var cylindermaterial = new THREE.MeshStandardMaterial( {
color: 0xffffff,
roughness: 0.8,
metalness: 0.4
});
var cylinder = new THREE.Mesh( cylindergeometry, cylindermaterial );
box_list.push({
mesh: cylinder,
startJoint,
endJoint
});
}
var updateCylinderMesh = function(mesh, vstart, vend){
var HALF_PI = Math.PI * .5;
var distance = vstart.distanceTo(vend);
var position = vend.clone().add(vstart).divideScalar(2);
mesh.geometry.dispose();
// TODO: creating a new geometry every frame is very bad for the performance
mesh.geometry = new THREE.CylinderBufferGeometry(0.006,0.006,distance,16);
var orientation = new THREE.Matrix4();//a new orientation matrix to offset pivot
var offsetRotation = new THREE.Matrix4();//a matrix to fix pivot rotation
var offsetPosition = new THREE.Matrix4();//a matrix to fix pivot position
orientation.lookAt(vstart,vend,new THREE.Vector3(0,1,0));//look at destination
offsetRotation.makeRotationX(HALF_PI);//rotate 90 degs on X
orientation.multiply(offsetRotation);//combine orientation with rotation transformations
mesh.geometry.applyMatrix4(orientation)
mesh.position.copy(position);
}
function initHands() {
for (const box of boxes_left) {
scene.remove(box.mesh);
}
for (const box of boxes_right) {
scene.remove(box.mesh);
}
for (const bone of bones_left) {
scene.remove(bone.mesh);
}
for (const bone of bones_right) {
scene.remove(bone.mesh);
}
boxes_left = [];
bones_left = [];
boxes_right = [];
bones_right = [];
// skeleton for hands
boxes = { left: boxes_left, right: boxes_right, leftBones: bones_left, rightBones: bones_right};
if (XRHand) {
for (let i = 0; i <= XRHand.LITTLE_PHALANX_TIP; i++) {
addBox(0, 0, 0, boxes_left, i);
addBox(0, 0, 0, boxes_right, i);
}
for (const connection of jointConnections) {
addBone(connection.startJoint, connection.endJoint, bones_left);
addBone(connection.startJoint, connection.endJoint, bones_right);
}
}
}
renderer.xr.onSessionStartedCallback = (session) => {
// create skelton meshes
initHands();
// get xrRefSpace
session.requestReferenceSpace('local').then((refSpace) => {
xrRefSpace = refSpace.getOffsetReferenceSpace(new XRRigidTransform({x: 0, y: 1.5, z: 0}));
});
};
// add canvas to dom
document.body.appendChild( renderer.domElement );
// add enter vr button to dom
document.body.appendChild( VRButton.createButton( renderer ) );
// set color and shadows
renderer.outputEncoding = THREE.sRGBEncoding;
renderer.shadowMap.enabled = true;
// enable xr
renderer.xr.enabled = true;
var geometry = new THREE.SphereGeometry(0.2, 32, 32);
var material = new THREE.MeshStandardMaterial({color: 0xff4466, roughness: 0.8, metalness: 0.2});
var cube = new THREE.Mesh( geometry, material );
cube.position.z = -0.5;
cube.position.y = 1;
cube.castShadow = true;
scene.add( cube );
function createEnvironment() {
var geometry = new THREE.PlaneBufferGeometry( 4, 4 );
var material = new THREE.MeshStandardMaterial( {
color: 0xeeeeee,
roughness: 1.0,
metalness: 0.0
});
var floor = new THREE.Mesh( geometry, material );
floor.rotation.x = - Math.PI / 2;
floor.receiveShadow = true;
scene.add( floor );
scene.add( new THREE.HemisphereLight( 0x808080, 0x606060 ) );
var light = new THREE.DirectionalLight( 0xffffff );
light.position.set( 0, 6, 0 );
light.castShadow = true;
light.shadow.camera.top = 2;
light.shadow.camera.bottom = - 2;
light.shadow.camera.right = 2;
light.shadow.camera.left = - 2;
light.shadow.mapSize.set( 4096, 4096 );
scene.add( light );
}
function updateInputSources(session, frame, refSpace) {
for (let inputSource of session.inputSources) {
if (!inputSource.hand) {
continue;
} else {
let visible = false;
for (const box of boxes[inputSource.handedness]) {
let jointPose = null;
if (inputSource.hand[box.offset] !== null) {
jointPose = frame.getJointPose(inputSource.hand[box.offset], refSpace);
}
if (jointPose !== null) {
visible = true;
scene.add(box.mesh);
box.mesh.position.set(jointPose.transform.position.x, jointPose.transform.position.y + 1.5, jointPose.transform.position.z);
const q = new THREE.Quaternion(jointPose.transform.orientation.x, jointPose.transform.orientation.y, jointPose.transform.orientation.z, jointPose.transform.orientation.w);
box.mesh.quaternion.copy(q);
const radius = 0.008;
box.mesh.scale.set(radius, radius, radius);
} else {
scene.remove(box.mesh);
}
}
if (visible) {
for (const bone of boxes.leftBones) {
scene.add(bone.mesh);
updateCylinderMesh(bone.mesh, boxes.left[bone.startJoint].mesh.position, boxes.left[bone.endJoint].mesh.position);
}
for (const bone of boxes.rightBones) {
scene.add(bone.mesh);
updateCylinderMesh(bone.mesh, boxes.right[bone.startJoint].mesh.position, boxes.right[bone.endJoint].mesh.position);
}
} else {
for (const bone of boxes.leftBones) {
scene.remove(bone.mesh);
}
for (const bone of boxes.rightBones) {
scene.remove(bone.mesh);
}
}
}
}
}
function grabCheck(hand) {
const indexTip = hand[XRHand.INDEX_PHALANX_TIP].mesh;
const thumbTip = hand[XRHand.THUMB_PHALANX_TIP].mesh;
const distance = indexTip.position.distanceTo(thumbTip.position);
return distance < 0.01;
}
let offsetLeft = null;
let offsetRight = null;
renderer.setAnimationLoop( function (time, frame) {
if (frame != null && xrRefSpace != null) {
updateInputSources(renderer.xr.getSession(), frame, xrRefSpace);
cube.geometry.computeBoundingBox();
var sphereBBox = new THREE.Box3(new THREE.Vector3(), new THREE.Vector3());
sphereBBox.setFromObject(cube);
if (grabCheck(boxes.left)) {
if (sphereBBox.containsPoint(boxes.left[XRHand.INDEX_PHALANX_TIP].mesh.position)) {
if (offsetLeft === null) {
offsetLeft = new THREE.Vector3().subVectors(boxes.left[XRHand.INDEX_PHALANX_TIP].mesh.position, cube.position);
}
cube.position.set(boxes.left[XRHand.INDEX_PHALANX_TIP].mesh.position.x - offsetLeft.x, boxes.left[XRHand.INDEX_PHALANX_TIP].mesh.position.y - offsetLeft.y, boxes.left[XRHand.INDEX_PHALANX_TIP].mesh.position.z - offsetLeft.z);
}
} else {
offsetLeft = null;
}
if (grabCheck(boxes.right)) {
if (sphereBBox.containsPoint(boxes.right[8].mesh.position)) {
if (offsetRight === null) {
offsetRight = new THREE.Vector3().subVectors(boxes.right[XRHand.INDEX_PHALANX_TIP].mesh.position, cube.position);
}
cube.position.set(boxes.right[XRHand.INDEX_PHALANX_TIP].mesh.position.x - offsetRight.x, boxes.right[XRHand.INDEX_PHALANX_TIP].mesh.position.y - offsetRight.y, boxes.right[XRHand.INDEX_PHALANX_TIP].mesh.position.z - offsetRight.z);
}
} else {
offsetRight = null;
}
}
renderer.render( scene, camera );
} );
createEnvironment();
</script>
</body>
</html>