three.js尝试(二)模拟游戏开发：3D人物在地图上行走

本次尝试，模拟了一个小人物在场景中行走，使用简单模型建立了森林，图片纹理模拟草地，加载3D模型呈现人物，使用按键asdw模拟人物的行走，行走和站立时人物的切换等。

主要用到点：3D模型的加载，模型的动画（行走与站立）之间的切换。

不足之处：没有检测碰撞与边界。

代码如下：

<!DOCTYPE html>

<html>

<head>

<style>

</style>

</head>

<body>

var scene, camera, renderer, controls, flag = 1;

var target;

var trees; // 荧光棒

var role; // 主角

var textPlane;

var stateList = {};

var actionMap = {

up: { direction: 'up', rotation: Math.PI, axes: 'z' },

down: { direction: 'down', rotation: 0, axes: 'z' },

left: { direction: 'left', rotation: - Math.PI / 2, axes: 'x' },

right: { direction: 'right', rotation: Math.PI / 2, axes: 'x' }

};

var nopeAction = { direction: null };

var nextAction = { direction: 'down', rotation: 0 };

var clock, mixer, currentAction, previousAction, lastkey;

function init() {

scene = new THREE.Scene();

camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 500);

camera.position.z = 20;

camera.lookAt(scene.position);

scene.add(camera);

renderer = new THREE.WebGLRenderer();

renderer.setSize(window.innerWidth, window.innerHeight);

renderer.shadowMap.enabled = true;

renderer.shadowMap.type = THREE.PCFSoftShadowMap; // default THREE.PCFShadowMap

document.body.appendChild(renderer.domElement);

controls = new THREE.OrbitControls(camera, renderer.domElement);

controls.update();

clock = new THREE.Clock();

window.addEventListener('resize', onWindowResize, false);

var axesHelper = new THREE.AxesHelper(50);

scene.add(axesHelper);

}

function onWindowResize() {

camera.aspect = window.innerWidth / window.innerHeight;

renderer.setSize(window.innerWidth, window.innerHeight);

}

function run() {

init();

createRole(); //创建角色

createAmbientLight(); // 绘制环境光

// createSpotlist(new THREE.Vector3(50, 50, 50), role);

createPlane(); // 创建舞台平面

createTrees(20);

window.addEventListener('keydown', keyPressed, false);

window.addEventListener('keyup', keyUp, false)

render();

}

function render() {

var dt = clock.getDelta();

if (mixer) mixer.update(dt);

requestAnimationFrame(render);

controls.update();

handleRoleAction();

renderer.render(scene, camera);

}

run();

function createAmbientLight() {

var light = new THREE.AmbientLight(0xdddddd); // soft white light

scene.add(light);

}

function createPlane() {

//Create a plane that receives shadows (but does not cast them)

var planeGeometry = new THREE.PlaneBufferGeometry(1000, 1000);

var texture = new THREE.TextureLoader().load('../images/grasslight-big.jpg');

texture.wrapS = texture.wrapT = THREE.RepeatWrapping;

texture.repeat.set(25, 25);

var planeMaterial = new THREE.MeshStandardMaterial({ map: texture, side: THREE.DoubleSide });

var plane = new THREE.Mesh(planeGeometry, planeMaterial);

plane.rotation.x = -Math.PI / 2;

plane.position.y = -16;

plane.receiveShadow = true;

scene.add(plane);

}

function createSpotlist(Vector3, target) {

var spotLight = new THREE.SpotLight(0xffffff);

spotLight.position.set(Vector3.x, Vector3.y, Vector3.z);

spotLight.castShadow = true;

spotLight.angle = Math.PI / 18;

spotLight.shadow.mapSize.width = 512;

spotLight.shadow.mapSize.height = 512;

spotLight.shadow.camera.near = 0.5;

spotLight.shadow.camera.far = 500;

spotLight.shadow.camera.fov = 30;

spotLight.target = target;

scene.add(spotLight);

// Create a helper for the spotlight

// var helper = new THREE.SpotLightHelper(spotLight);

// scene.add(helper);

// //Create a helper for the shadow camera (optional)

// var helper = new THREE.CameraHelper(spotLight.shadow.camera);

// scene.add(helper);

}

function createTrees(num) {

for (let i = 0; i < num; i++) {

let treeNode = new THREE.Object3D();

var treeTopGeo = new THREE.CylinderGeometry(0, 10, 20, 32);

var treeTopMaterial = new THREE.MeshBasicMaterial({ color: 0xffff00 });

var treeTop = new THREE.Mesh(treeTopGeo, treeTopMaterial);

treeTop.position.y = 4; // 树底部中心点高度是-11，底部的上边高度是-6，这样树顶部中心点高度默认是0的话，下边是-10，如果想让下边高度为-6，则中心点高度为4

var treeBottomGeo = new THREE.CylinderGeometry(5, 5, 10, 32);

var treeBottomMaterial = new THREE.MeshBasicMaterial({ color: 0xffff00 });

var treeBottom = new THREE.Mesh(treeBottomGeo, treeBottomMaterial);

treeBottom.position.y = -11; // 底面位置是-16，底部圆柱体中心点高度默认是0的话，底边高度是-5，所以将position.y设置为-11，这样下边高度是-16

treeNode.add(treeTop);

treeNode.add(treeBottom);

treeNode.position.set(util.createRandomPos(-250, 250), 0, util.createRandomPos(-250, 250));

scene.add(treeNode);

}

function createRole() {

// model

var loader = new THREE.GLTFLoader();

loader.load('../models/RobotExpressive.glb', function (gltf) {

role = gltf.scene;

role.position.y = -16;

mixer = new THREE.AnimationMixer(role);

stateList.Walking = mixer.clipAction(gltf.animations[10]);

stateList.Standing = mixer.clipAction(gltf.animations[8]);

// 设置下面两项主要是站着的时候，别抖了

stateList.Standing.clampWhenFinished = true;

stateList.Standing.loop = THREE.LoopOnce;

currentAction = stateList.Standing;

currentAction.play();

scene.add(role);

createSpotlist(new THREE.Vector3(50, 50, 50), role);

}, undefined, function (e) {

console.error(e);

});

}

function keyPressed(e) {

var key = event.keyCode;

if (lastkey != key) {

lastkey = key;

fadeToAction('Walking', 0.2);

}

switch (key) {

case 87:

/*w*/

nextAction = actionMap.up;

break;

case 65:

/*a*/

nextAction = actionMap.left;

break;

case 83:

/*s*/

nextAction = actionMap.down;

break;

case 68:

/*d*/

nextAction = actionMap.right;

break;

}

if (role) role.rotation.y = nextAction.rotation;

}

function keyUp() {

nextAction = nopeAction;

fadeToAction('Standing', 0.2);

}

function handleRoleAction() {

if (role) {

if (nextAction.direction == 'down' || nextAction.direction == "right") {

flag = 1;

} else if (nextAction.direction == 'up' || nextAction.direction == "left") {

flag = -1;

}

else {

flag = 0;

}

role.position[nextAction.axes] += 0.2 * flag;

}

function fadeToAction(name, duration) {

previousAction = currentAction;

currentAction = stateList[name];

if (previousAction !== currentAction) {

previousAction.fadeOut(duration);

}

if (currentAction) {

currentAction

.reset()

.setEffectiveTimeScale(1)

.setEffectiveWeight(1)

.fadeIn(duration)

.play();

}

</script>

</body>

</html>

three.js尝试(二)模拟游戏开发：3D人物在地图上行走

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