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Cesium-Examples/examples/cesiumEx/6.1.5、撞击断裂体.html

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refactor: 求个star
2025-03-11 08:25:45 +00:00
<!--********************************************************************
* by jiawanlong
*********************************************************************-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
整理目录
2025-03-19 03:00:22 +00:00
<link rel="stylesheet" href="./../../libs/cesium/Cesium1.72/Widgets/widgets.css" />
<script type="text/javascript" src="./../../libs/cesium/Cesium1.72/Cesium.js"></script>
refactor: 求个star
2025-03-11 08:25:45 +00:00
<script src="./ammolibs/ammo/ammo.js"></script>
</head>
<body style="
margin: 0;
overflow: hidden;
background: #fff;
width: 100%;
height: 100%;
position: absolute;
top: 0;
">
<div id="cesiumContainer" style="margin: 0 auto; width: 100%; height: 100%"></div>
<!-- 面板 -->
<div class="infoview">
操作提示：鼠标左键单击进行发射
</div>
<script src="./ammolibs/three/three.min.js"></script>
<script src="./ammolibs/ammo/ex/ConvexObjectBreaker.js"></script>
<script src="./ammolibs/ammo/ex/QuickHull.js"></script>
<script src="./ammolibs/ammo/ex/geometries/ConvexGeometry.js"></script>
<script src="./ammolibs/meshVisualizer/CesiumMeshVisualizer.js"></script>
<script>
Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiI3ZjQ5ZGUzNC1jNWYwLTQ1ZTMtYmNjYS05YTY4ZTVmN2I2MDkiLCJpZCI6MTE3MTM4LCJpYXQiOjE2NzY0NDUyODB9.ZaNSBIfc1sGLhQd_xqhiSsc0yr8oS0wt1hAo9gbke6M'
const viewer = new Cesium.Viewer('cesiumContainer', {});
var homePosition = [117.220206, 31.834866, 100]; //初始位置
look(homePosition[0], homePosition[1], homePosition[2]);
viewer.scene.debugShowFramesPerSecond = true; //查看帧率
MeshVisualizer = Cesium.MeshVisualizer;
Mesh = Cesium.Mesh;
MeshMaterial = Cesium.MeshMaterial;
FramebufferTexture = Cesium.FramebufferTexture;
GeometryUtils = Cesium.GeometryUtils;
MeshPhongMaterial = Cesium.MeshPhongMaterial;
BasicMeshMaterial = Cesium.BasicMeshMaterial;
LOD = Cesium.LOD;
var center = Cesium.Cartesian3.fromDegrees(homePosition[0], homePosition[1], 10);
var modelMatrix = Cesium.Transforms.eastNorthUpToFixedFrame(center);
var meshVisualizer = new MeshVisualizer({
modelMatrix: modelMatrix,
up: {
y: 1
},
referenceAxisParameter: {
length: 100,
width: 0.05,
headLength: 2,
headWidth: 0.1
}
});
viewer.scene.primitives.add(meshVisualizer);
meshVisualizer.showReference = true; //显示坐标轴
function createRandomColor() {
return Cesium.Color.fromRandom({
alpha: 1
}) //fromRgba(Math.floor(Math.random() * (1 << 24)));
}
function createMaterial(color) {
if (typeof color === 'string') {
} else if (Cesium.defined(color)) {
color = Cesium.Color.fromRgba(color).withAlpha(1);
} else {
color = createRandomColor();
}
return new MeshPhongMaterial({
defaultColor: color,
side: MeshMaterial.Sides.DOUBLE,
translucent: false
});
}
var groundMaterial = new MeshPhongMaterial({
defaultColor: "rgb(200,200,200)",
side: MeshMaterial.Sides.DOUBLE,
translucent: false
})
Cesium.Cartesian3.prototype.set = function (x, y, z) {
this.x = x;
this.y = y;
this.z = z;
}
Cesium.Cartesian2.prototype.set = function (x, y) {
this.x = x;
this.y = y;
}
Cesium.Quaternion.prototype.set = function (x, y, z, w) {
this.x = x;
this.y = y;
this.z = z;
this.w = w;
}
Ammo().then(function () {
// - Global variables -
// Graphics variables
var clock = new THREE.Clock();
var mouseCoords = new THREE.Vector2();
var raycaster = new THREE.Raycaster();
var ballMaterial = createMaterial(0x202020);
// Physics variables
var gravityConstant = 7.8;
var collisionConfiguration;
var dispatcher;
var broadphase;
var solver;
var physicsWorld;
var margin = 0.05;
var convexBreaker = new THREE.ConvexObjectBreaker();
// Rigid bodies include all movable objects
var rigidBodies = [];
var pos = new THREE.Vector3();
var quat = new THREE.Quaternion();
var transformAux1 = new Ammo.btTransform();
var tempBtVec3_1 = new Ammo.btVector3(0, 0, 0);
var time = 0;
var objectsToRemove = [];
for (var i = 0; i < 500; i++) {
objectsToRemove[i] = null;
}
var numObjectsToRemove = 0;
var impactPoint = new THREE.Vector3();
var impactNormal = new THREE.Vector3();
function initPhysics() {
// Physics configuration
collisionConfiguration = new Ammo.btDefaultCollisionConfiguration();
dispatcher = new Ammo.btCollisionDispatcher(collisionConfiguration);
broadphase = new Ammo.btDbvtBroadphase();
solver = new Ammo.btSequentialImpulseConstraintSolver();
physicsWorld = new Ammo.btDiscreteDynamicsWorld(dispatcher, broadphase, solver, collisionConfiguration);
physicsWorld.setGravity(new Ammo.btVector3(0, -gravityConstant, 0));
}
function createObject(mass, halfExtents, pos, quat, material) {
//y，z调换位置
var object = new THREE.Mesh(new THREE.BoxGeometry(halfExtents.x * 2, halfExtents.y * 2, halfExtents.z * 2),
material);
object.position.copy(pos);
object.quaternion.copy(quat);
//object.position.y += 3;
convexBreaker.prepareBreakableObject(object, mass, new THREE.Vector3(), new THREE.Vector3(), true);
createDebrisFromBreakableObject(object);
}
function createObjects() {
// Ground
pos.set(0, -0.5, 0);
quat.set(0, 0, 0, 1);
var ground = createParalellepipedWithPhysics(40, 1, 40, 0, pos, quat, createMaterial(0xFFFFFF));
// Tower 1
var towerMass = 1000;
var towerHalfExtents = new THREE.Vector3(2, 5, 2);
pos.set(-8, 5, 0);
quat.set(0, 0, 0, 1);
createObject(towerMass, towerHalfExtents, pos, quat, createMaterial("rgb(247,174,68)"));
// Tower 2
pos.set(8, 5, 0);
quat.set(0, 0, 0, 1);
createObject(towerMass, towerHalfExtents, pos, quat, createMaterial("rgb(247,174,68)"));
//Bridge
var bridgeMass = 100;
var bridgeHalfExtents = new THREE.Vector3(7, 0.2, 1.5);
pos.set(0, 10.2, 0);
quat.set(0, 0, 0, 1);
createObject(bridgeMass, bridgeHalfExtents, pos, quat, createMaterial("rgb(247,174,68)"));
// Stones
var stoneMass = 120;
var stoneHalfExtents = new THREE.Vector3(1, 2, 0.15);
var numStones = 8;
quat.set(0, 0, 0, 1);
for (var i = 0; i < numStones; i++) {
pos.set(0, 2, 15 * (0.5 - i / (numStones + 1)));
createObject(stoneMass, stoneHalfExtents, pos, quat, createMaterial(0xB0B0B0));
}
// Mountain
var mountainMass = 860;
var mountainHalfExtents = new THREE.Vector3(4, 5, 4);
pos.set(5, mountainHalfExtents.y * 0.5, -7);
quat.set(0, 0, 0, 1);
var mountainPoints = [];
//y，z调换位置
mountainPoints.push(new THREE.Vector3(mountainHalfExtents.x, -mountainHalfExtents.y, mountainHalfExtents
.z));
mountainPoints.push(new THREE.Vector3(-mountainHalfExtents.x, -mountainHalfExtents.y, mountainHalfExtents
.z));
mountainPoints.push(new THREE.Vector3(mountainHalfExtents.x, -mountainHalfExtents.y, -mountainHalfExtents
.z));
mountainPoints.push(new THREE.Vector3(-mountainHalfExtents.x, -mountainHalfExtents.y, -mountainHalfExtents
.z));
mountainPoints.push(new THREE.Vector3(0, mountainHalfExtents.y, 0));
var mountain = new THREE.Mesh(new THREE.ConvexGeometry(mountainPoints), createMaterial("rgb(247,174,68)"));
mountain.position.copy(pos);
mountain.quaternion.copy(quat);
convexBreaker.prepareBreakableObject(mountain, mountainMass, new THREE.Vector3(), new THREE.Vector3(),
true);
createDebrisFromBreakableObject(mountain);
}
function createParalellepipedWithPhysics(sx, sy, sz, mass, pos, quat, material) {
var box = Cesium.BoxGeometry.createGeometry(Cesium.BoxGeometry.fromDimensions({
dimensions: new Cesium.Cartesian3(sx, sy, sz),
vertexFormat: new Cesium.VertexFormat({
position: true,
normal: true
})
}));
var object = new Mesh(box, material);
object.quaternion = new Cesium.Quaternion();
var shape = new Ammo.btBoxShape(new Ammo.btVector3(sx * 0.5, sy * 0.5, sz * 0.5));
shape.setMargin(margin);
createRigidBody(object, shape, mass, pos, quat);
return object;
}
function createDebrisFromBreakableObject(object) {
object.castShadow = true;
object.receiveShadow = true;
var shape = createConvexHullPhysicsShape(object.geometry.vertices);
shape.setMargin(margin);
var body = createRigidBody(object, shape, object.userData.mass, null, null, object.userData.velocity, object
.userData.angularVelocity);
// Set pointer back to the three object only in the debris objects
var btVecUserData = new Ammo.btVector3(0, 0, 0);
btVecUserData.threeObject = object;
body.setUserPointer(btVecUserData);
}
function removeDebris(object) {
meshVisualizer.remove(object);
physicsWorld.removeRigidBody(object.userData.physicsBody);
}
function createConvexHullPhysicsShape(points) {
var shape = new Ammo.btConvexHullShape();
for (var i = 0, il = points.length; i < il; i++) {
var p = points[i];
tempBtVec3_1.setValue(p.x, p.y, p.z); //y,z调换位置
var lastOne = (i === (il - 1));
shape.addPoint(tempBtVec3_1, lastOne);
}
return shape;
}
function createRigidBody(object, physicsShape, mass, pos, quat, vel, angVel) {
if (pos) {
object.position.copy(pos);
} else {
pos = object.position;
}
if (quat) {
if (object.quaternion)
object.quaternion.copy(quat);
} else {
quat = object.quaternion;
}
var transform = new Ammo.btTransform();
transform.setIdentity();
transform.setOrigin(new Ammo.btVector3(pos.x, pos.y, pos.z));
transform.setRotation(new Ammo.btQuaternion(quat.x, quat.y, quat.z, quat.w));
var motionState = new Ammo.btDefaultMotionState(transform);
var localInertia = new Ammo.btVector3(0, 0, 0);
physicsShape.calculateLocalInertia(mass, localInertia);
var rbInfo = new Ammo.btRigidBodyConstructionInfo(mass, motionState, physicsShape, localInertia);
var body = new Ammo.btRigidBody(rbInfo);
body.setFriction(0.5);
if (vel) {
body.setLinearVelocity(new Ammo.btVector3(vel.x, vel.y, vel.z));
}
if (angVel) {
body.setAngularVelocity(new Ammo.btVector3(angVel.x, angVel.y, angVel.z));
}
object.userData.physicsBody = body;
object.userData.collided = false;
meshVisualizer.add(object);
if (mass > 0) {
rigidBodies.push(object);
// Disable deactivation
body.setActivationState(4);
}
physicsWorld.addRigidBody(body);
return body;
}
function updatePhysics(deltaTime) {
// Step world
physicsWorld.stepSimulation(deltaTime, 10);
// Update rigid bodies
for (var i = 0, il = rigidBodies.length; i < il; i++) {
var objThree = rigidBodies[i];
var objPhys = objThree.userData.physicsBody;
var ms = objPhys.getMotionState();
if (ms) {
ms.getWorldTransform(transformAux1);
var p = transformAux1.getOrigin();
var q = transformAux1.getRotation();
objThree.position.set(p.x(), p.y(), p.z());
if (objThree.quaternion) {
objThree.quaternion.set(q.x(), q.y(), q.z(), q.w());
}
objThree.userData.collided = false;
objThree.modelMatrixNeedsUpdate = true;
}
}
for (var i = 0, il = dispatcher.getNumManifolds(); i < il; i++) {
var contactManifold = dispatcher.getManifoldByIndexInternal(i);
var rb0 = contactManifold.getBody0();
var rb1 = contactManifold.getBody1();
var threeObject0 = Ammo.castObject(rb0.getUserPointer(), Ammo.btVector3).threeObject;
var threeObject1 = Ammo.castObject(rb1.getUserPointer(), Ammo.btVector3).threeObject;
if (!threeObject0 && !threeObject1) {
continue;
}
var userData0 = threeObject0 ? threeObject0.userData : null;
var userData1 = threeObject1 ? threeObject1.userData : null;
var breakable0 = userData0 ? userData0.breakable : false;
var breakable1 = userData1 ? userData1.breakable : false;
var collided0 = userData0 ? userData0.collided : false;
var collided1 = userData1 ? userData1.collided : false;
if ((!breakable0 && !breakable1) || (collided0 && collided1)) {
continue;
}
var contact = false;
var maxImpulse = 0;
for (var j = 0, jl = contactManifold.getNumContacts(); j < jl; j++) {
var contactPoint = contactManifold.getContactPoint(j);
if (contactPoint.getDistance() < 0) {
contact = true;
var impulse = contactPoint.getAppliedImpulse();
if (impulse > maxImpulse) {
maxImpulse = impulse;
var pos = contactPoint.get_m_positionWorldOnB();
var normal = contactPoint.get_m_normalWorldOnB();
impactPoint.set(pos.x(), pos.y(), pos.z());
impactNormal.set(normal.x(), normal.y(), normal.z());
}
break;
}
}
// If no point has contact, abort
if (!contact) {
continue;
}
// Subdivision
var fractureImpulse = 250;
if (breakable0 && !collided0 && maxImpulse > fractureImpulse) {
var debris = convexBreaker.subdivideByImpact(threeObject0, impactPoint, impactNormal, 1, 2, 1.5);
var numObjects = debris.length;
for (var j = 0; j < numObjects; j++) {
createDebrisFromBreakableObject(debris[j]);
}
objectsToRemove[numObjectsToRemove++] = threeObject0;
userData0.collided = true;
}
if (breakable1 && !collided1 && maxImpulse > fractureImpulse) {
var debris = convexBreaker.subdivideByImpact(threeObject1, impactPoint, impactNormal, 1, 2, 1.5);
var numObjects = debris.length;
for (var j = 0; j < numObjects; j++) {
createDebrisFromBreakableObject(debris[j]);
}
objectsToRemove[numObjectsToRemove++] = threeObject1;
userData1.collided = true;
}
}
for (var i = 0; i < numObjectsToRemove; i++) {
removeDebris(objectsToRemove[i]);
}
numObjectsToRemove = 0;
}
var ray = new Cesium.Ray();
var clickRequest = false;
var start = false;
var hasInit = false;
var startTime = new Date();
var rayDir = new Cesium.Cartesian3();
function initInput() {
var scene = viewer.scene;
var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
var lastMesh = null;
handler.setInputAction(function (movement) {
if (!clickRequest) {
Cesium.Cartesian2.clone(movement.position, mouseCoords);
clickRequest = true;
}
}, Cesium.ScreenSpaceEventType.LEFT_DOWN);
}
function processClick() {
if (clickRequest) {
meshVisualizer.getPickRay(mouseCoords, ray);
if (!ray) {
clickRequest = false;
return;
}
// Creates a ball
var ballMass = 35;
var ballRadius = 0.4;
var ball = new Mesh(new Cesium.SphereGeometry({
radius: ballRadius,
stackPartitions: 14,
slicePartitions: 10
}), ballMaterial);
var ballShape = new Ammo.btSphereShape(ballRadius);
ballShape.setMargin(margin);
Cesium.Cartesian3.clone(ray.direction, rayDir);
Cesium.Cartesian3.subtract(ray.origin, ray.direction, pos);
quat.set(0, 0, 0, 1);
var ballBody = createRigidBody(ball, ballShape, ballMass, pos, quat);
//ballBody.setFriction(0.5);
Cesium.Cartesian3.normalize(rayDir, rayDir);
Cesium.Cartesian3.multiplyByScalar(rayDir, 50, rayDir);
//console.log(rayDir);
ballBody.setLinearVelocity(new Ammo.btVector3(rayDir.x, rayDir.y, rayDir.z));
clickRequest = false;
}
}
var hs = false;
function update(frameState) {
if (hs)
return;
var deltaTime = (new Date() - startTime) / 1000.0;
updatePhysics(deltaTime);
processClick();
startTime = new Date();
// hs = true;
}
setTimeout(function () {
if (!hasInit) {
// - Init -
initPhysics();
createObjects();
initInput();
hasInit = true;
}
if (!start) {
startTime = new Date();
meshVisualizer.beforeUpdate.addEventListener(update);
start = true;
} else {
meshVisualizer.beforeUpdate.removeEventListener(update);
start = false;
}
}, 1000 * 3);
});
function look(lon, lat, offset) {
var center = Cesium.Cartesian3.fromDegrees(lon, lat);
var transform = Cesium.Transforms.eastNorthUpToFixedFrame(center);
// View in east-north-up frame
var camera = viewer.camera;
camera.constrainedAxis = Cesium.Cartesian3.UNIT_Z;
camera.lookAtTransform(transform, new Cesium.Cartesian3(-offset, -offset, offset));
setTimeout(function () {
camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
}, 100)
}
</script>
</body>
</html>
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