添加3d环境下的摄像机跟随

CameraFollowDemo/.gitignore

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+
+#///////////////////////////
+# Cocos Creator 3D Project
+#///////////////////////////
+library/
+temp/
+local/
+build/
+profiles/
+native
+#//////////////////////////
+# NPM
+#//////////////////////////
+node_modules/
+
+#//////////////////////////
+# VSCode
+#//////////////////////////
+.vscode/
+
+#//////////////////////////
+# WebStorm
+#//////////////////////////
+.idea/

CameraFollowDemo/README.md

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+# 相机跟随
+
+## 计算目标节点的前向量(世界坐标下)
+~~~
+节点当前四元数=获取世界坐标系下的旋转()
+向向量=向量四元数乘法(节点默认前方向，节点当前四元数)
+向向量=向向量.将当前向量归一化()
+~~~
+
+## 计算摄像机的向前四元数
+~~~
+摄像机前向量=摄像机位置-目标节点位置
+摄像机节点前向量=摄像机前向量*-1
+角度四元数=根据视口的前方向和上方向计算四元数()
+摄像机节点角度四元数=角度四元数
+~~~
+
+## 计算跟随距离
+~~~
+CameraPos=TargetPos-TargetForward*hDist+targetUp*vDist;
+摄像机位置=目标节点位置-目标节点单位前向量*水平距离+目标节点单位上向量*垂直距离
+~~~
+
+## 计算弹簧
+~~~
+理想位置=计算理想位置函数()
+相对差值=实际位置-理想位置
+加速度=-1*弹性系数*相对差值-阻尼系数*当前速度
+速度=速度+加速度*间隔时间
+实际位置=实际位置+速度*间隔时间
+~~~
+
+## 参考
+* https://mp.weixin.qq.com/s?__biz=MzI1Nzk1MzExNw==&mid=2247485617&idx=1&sn=839880f5200bbf0376f1885c997a791d&chksm=ea0ed483dd795d950cbfe2150fb02a5deece940731ce1e240936c2b69cfc44ecdd53d546bb09&cur_album_id=1342270984425996289&scene=190#rd
+* github https://gitee.com/lamyoung/cocos-creator-3d-examples/blob/master/springCamera/assets/src/SpringCamera.ts

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CameraFollowDemo/assets/scripts/CameraFollow.ts

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+
+import { _decorator, Component, Node, Vec3, v3, Quat, Enum } from 'cc';
+import { NHelper } from './NHelper';
+const { ccclass, property } = _decorator;
+
+export enum ECameraState {
+    /**不跟随 */
+    idle,
+    /**跟随 */
+    look,
+}
+
+@ccclass('CameraFollow')
+export class CameraFollow extends Component {
+    @property({ type: Node, displayName: "跟随目标" })
+    protected target: Node = null;
+    @property({ type: Enum(ECameraState), displayName: "跟随状态" })
+    protected state: ECameraState = ECameraState.look;
+    @property({ displayName: "水平跟随距离" })
+    protected hDist: number = 5;
+    @property({ displayName: "垂直跟随距离" })
+    protected vDist: number = 4;
+
+    private tempPos: Vec3 = v3();
+
+    start() {
+
+    }
+
+    /**
+     * 计算前向量
+     * @returns 
+     */
+    protected getUp() {
+        return v3(0, 1, 0);
+    }
+
+    /**
+     * 计算跟随距离
+     * @returns 
+     */
+    protected computeCameraPos(out: Vec3 = null): Vec3 {
+        let tempPos = out ? out : this.tempPos;
+        this.target.getWorldPosition(tempPos);
+        let forward = NHelper.getForward(this.target);
+        forward.multiplyScalar(-this.hDist);
+        tempPos.add(forward);
+        tempPos.add(this.getUp().multiplyScalar(this.vDist));
+        return tempPos;
+    }
+
+    /**
+     * 跟随
+     * @param dt 
+     */
+    protected lookAt(dt: number) {
+        let pos = this.computeCameraPos();
+        this.updatePosition(pos);
+        this.updateRotation(pos);
+    }
+
+    /**
+     * 更新跟随位置
+     * @param pos 
+     */
+    protected updatePosition(pos: Vec3) {
+        this.node.worldPosition = pos;
+    }
+
+    /**
+     * 更新角度四元数
+     * @param pos 
+     */
+    protected updateRotation(pos: Vec3) {
+        //camera前方向
+        let forward = this.target.position.clone().subtract(pos);
+        //取反得到camera节点的前方向
+        forward.multiplyScalar(-1).normalize();
+        //构造四元数
+        let quat = new Quat();
+        Quat.fromViewUp(quat, forward, this.getUp());
+        this.node.setRotation(quat);
+    }
+
+    update(deltaTime: number) {
+        if (this.state == ECameraState.look) {
+            this.lookAt(deltaTime);
+        }
+    }
+}
+

CameraFollowDemo/assets/scripts/CameraFollow.ts.meta

@@ -0,0 +1,9 @@
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+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "96df90e9-217e-4c3a-a4cd-02ed0ffb48a4",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/scripts/InputManager.ts

@@ -0,0 +1,79 @@
+
+import { _decorator, Component, Node, input, Input, EventKeyboard, KeyCode, game } from 'cc';
+const { ccclass, property } = _decorator;
+
+
+@ccclass('InputManager')
+export class InputManager extends Component {
+    // [1]
+    // dummy = '';
+
+    // [2]
+    // @property
+    // serializableDummy = 0;
+
+    onLoad() {
+
+    }
+
+    start() {
+
+    }
+
+    onEnable() {
+        input.on(Input.EventType.KEY_DOWN, this.onKeyDown, this);
+        input.on(Input.EventType.KEY_UP, this.onKeyUp, this);
+
+    }
+
+    onDisable() {
+        input.off(Input.EventType.KEY_DOWN, this.onKeyDown, this);
+        input.off(Input.EventType.KEY_UP, this.onKeyUp, this);
+    }
+
+    onKeyDown(event: EventKeyboard) {
+        switch (event.keyCode) {
+            case KeyCode.KEY_A: {
+                console.log('key a');
+                //left
+                game.emit("rule_horizontal_push", 1)
+            } break;
+            case KeyCode.KEY_D: {
+                console.log('key d');
+                game.emit("rule_horizontal_push", -1)
+            } break;
+            case KeyCode.KEY_W: {
+                game.emit("rule_vertical_push", 1)
+            } break;
+            case KeyCode.KEY_S: {
+                game.emit("rule_vertical_push", -1)
+            } break;
+        }
+    }
+
+    onKeyUp(event: EventKeyboard) {
+        switch (event.keyCode) {
+            case KeyCode.KEY_A: {
+                console.log('key a');
+                //left
+                game.emit("rule_horizontal_push", 0)
+            } break;
+            case KeyCode.KEY_D: {
+                console.log('key d');
+                game.emit("rule_horizontal_push", 0)
+            } break;
+            case KeyCode.KEY_W: {
+                game.emit("rule_vertical_push", 0)
+            } break;
+            case KeyCode.KEY_S: {
+                game.emit("rule_vertical_push", 0)
+            } break;
+        }
+    }
+
+    // update(deltaTime: number) {
+
+    // }
+}
+
+

CameraFollowDemo/assets/scripts/InputManager.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "4573374e-825b-4f65-8df0-65c6a72475d3",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/scripts/LookAt.ts

@@ -0,0 +1,31 @@
+
+import { _decorator, Component, Node, v3 } from 'cc';
+const { ccclass, property } = _decorator;
+
+
+@ccclass('LookAt')
+export class LookAt extends Component {
+
+    @property(Node)
+    target: Node = null;
+
+    start() {
+        // [3]
+    }
+
+    update(deltaTime: number) {
+        // [4]
+        this.node.lookAt(this.target.worldPosition,v3(0,1,0));
+    }
+}
+
+/**
+ * [1] Class member could be defined like this.
+ * [2] Use `property` decorator if your want the member to be serializable.
+ * [3] Your initialization goes here.
+ * [4] Your update function goes here.
+ *
+ * Learn more about scripting: https://docs.cocos.com/creator/3.4/manual/zh/scripting/
+ * Learn more about CCClass: https://docs.cocos.com/creator/3.4/manual/zh/scripting/ccclass.html
+ * Learn more about life-cycle callbacks: https://docs.cocos.com/creator/3.4/manual/zh/scripting/life-cycle-callbacks.html
+ */

CameraFollowDemo/assets/scripts/LookAt.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "3d2b16f4-afa5-42eb-9966-23d96ab87be3",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/scripts/NHelper.ts

@@ -0,0 +1,16 @@
+import { CCObject, Node, Quat, v3, Vec3 } from "cc";
+
+export class NHelper {
+    private static tempQuat: Quat = new Quat();
+    private static tempPos:Vec3=new Vec3();
+    /**
+     * 计算节点世界坐标下的向前向量
+     * @param node 目标节点
+     * @param defaultForward 默认前方向
+     */
+    public static getForward(node: Node, defaultForward: Vec3 = v3(0, 0, 1)) {
+        node.getWorldRotation(this.tempQuat);
+        Vec3.transformQuat(this.tempPos, defaultForward, this.tempQuat);
+        return this.tempPos.normalize();
+    }
+}

CameraFollowDemo/assets/scripts/NHelper.ts.meta

@@ -0,0 +1,9 @@
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+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "8ba48c76-b830-4db2-b387-7aeec8d76a10",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/scripts/Role.ts

@@ -0,0 +1,71 @@
+
+import { _decorator, Component, Node, game, Quat, v3, Vec3 } from 'cc';
+const { ccclass, property } = _decorator;
+
+@ccclass('Role')
+export class Role extends Component {
+
+    @property(Node)
+    target: Node = null;
+
+    private speed: number = 10;
+    private angleSpeed: number = 4;
+
+    onEnable() {
+        game.on("rule_horizontal_push", this.onMoveHorizontal, this);
+        game.on("rule_vertical_push", this.onMoveVertical, this);
+        console.log('forward=',this.getForward());
+    }
+
+    onDisable() {
+        game.off("rule_horizontal_push", this.onMoveHorizontal, this);
+        game.off("rule_vertical_push", this.onMoveVertical, this);
+    }
+
+    /**
+     * 
+     * @returns 
+     */
+    getForward() {
+        let rotation = this.target.getWorldRotation();
+        let forward=v3();
+        //通过角色的角度的四元数，取得前进向量
+        Vec3.transformQuat(forward,v3(0,0,1),rotation);
+        return forward.normalize();
+    }
+
+    private hDir: number = 0;
+    onMoveHorizontal() {
+        this.hDir = arguments[0];
+    }
+
+    private rotation(dt: number) {
+        let rotation = this.target.worldRotation;
+        let next = new Quat();
+        Quat.rotateAround(next, rotation, v3(0, 1, 0), this.angleSpeed * dt * this.hDir);
+        this.target.setRotation(next);
+    }
+
+    private vDir: number = 0;
+    onMoveVertical() {
+        this.vDir = arguments[0];
+    }
+
+    move(dt: number) {
+        let forward = this.getForward();
+        forward.multiplyScalar(this.speed * dt * this.vDir);
+        let pos = this.target.getWorldPosition().add(forward);
+        this.target.setWorldPosition(pos);
+    }
+
+    update(deltaTime: number) {
+        if (Math.abs(this.vDir) > 0) {
+            this.move(deltaTime);
+        }
+
+        if (Math.abs(this.hDir) > 0) {
+            this.rotation(deltaTime);
+        }
+    }
+}
+

CameraFollowDemo/assets/scripts/Role.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "44808a8f-99b0-441b-aa1d-7aebc1ee9ac6",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/scripts/SpringCamera.ts

@@ -0,0 +1,42 @@
+
+import { _decorator, Component, Node, Vec3, v3 } from 'cc';
+import { CameraFollow } from './CameraFollow';
+const { ccclass, property } = _decorator;
+
+@ccclass('SpringCamera')
+export class SpringCamera extends CameraFollow {
+    @property({ displayName: "弹性系数", tooltip: "数值越高表示越僵硬" })
+    protected springConst: number = 1000;
+    /**阻尼系数,数值是由弹性系数决定 */
+    protected dampeConst: number = 1;
+    /**移动速度*/
+    protected velocity: Vec3 = v3();
+    /**camera真实位置向量*/
+    protected actualPos: Vec3 = v3();
+    /**理想位置到真实位置的差值 */
+    private diff: Vec3 = v3();
+    /**弹簧加速度 */
+    private springAcc: Vec3 = v3();
+
+    onLoad() {
+        this.dampeConst = 2 * Math.sqrt(this.springConst);
+        //起初，设置位置为理想位置，就是基础跟随摄像机的眼睛位置一样
+        this.computeCameraPos(this.actualPos);
+        this.updatePosition(this.actualPos);
+        this.updateRotation(this.actualPos);
+    }
+
+    protected lookAt(dt: number) {
+        let idealPos = this.computeCameraPos();
+        //差值
+        Vec3.subtract(this.diff, this.actualPos, idealPos);
+        //计算加速度
+        Vec3.subtract(this.springAcc, this.diff.multiplyScalar(-1 * this.dampeConst), this.velocity.clone().multiplyScalar(this.dampeConst));
+        this.velocity.add(this.springAcc.multiplyScalar(dt));
+        this.actualPos.add(this.velocity.multiplyScalar(dt));
+        //更新位置跟角度
+        this.updatePosition(this.actualPos);
+        this.updateRotation(this.actualPos);
+    }
+}
+

CameraFollowDemo/assets/scripts/SpringCamera.ts.meta

@@ -0,0 +1,9 @@
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+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "def1b9e4-d41e-4626-b9fb-2e665c0cb254",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}

CameraFollowDemo/assets/skybox.meta

@@ -0,0 +1,12 @@
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+  "ver": "1.1.0",
+  "importer": "directory",
+  "imported": true,
+  "uuid": "9e344b1f-8681-4ddf-bcc6-bb014c332bb8",
+  "files": [],
+  "subMetas": {},
+  "userData": {
+    "compressionType": {},
+    "isRemoteBundle": {}
+  }
+}

CameraFollowDemo/assets/skybox/sunnySkyBox.jpg.meta

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+  "importer": "image",
+  "imported": true,
+  "uuid": "5af201b5-5951-4e2c-a81f-ac4aad9132cb",
+  "files": [
+    ".jpg",
+    ".json"
+  ],
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+      "uuid": "5af201b5-5951-4e2c-a81f-ac4aad9132cb@b47c0",
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+      "id": "b47c0",
+      "name": "textureCube",
+      "userData": {
+        "wrapModeS": "repeat",
+        "wrapModeT": "repeat",
+        "minfilter": "linear",
+        "magfilter": "linear",
+        "mipfilter": "linear",
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+        "isRGBE": false,
+        "imageDatabaseUri": "db://assets/skybox/sunnySkyBox.jpg"
+      },
+      "ver": "1.0.10",
+      "imported": true,
+      "files": [
+        ".json"
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+          "id": "e9a6d",
+          "name": "front",
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+          "id": "bb97f",
+          "name": "top",
+          "userData": {},
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+          "id": "7d38f",
+          "name": "bottom",
+          "userData": {},
+          "ver": "1.0.0",
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+            ".png",
+            ".json"
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+          "id": "74afd",
+          "name": "right",
+          "userData": {},
+          "ver": "1.0.0",
+          "imported": true,
+          "files": [
+            ".png",
+            ".json"
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+          "subMetas": {}
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+          "id": "8fd34",
+          "name": "left",
+          "userData": {},
+          "ver": "1.0.0",
+          "imported": true,
+          "files": [
+            ".png",
+            ".json"
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+  "userData": {
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+}

CameraFollowDemo/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "CameraFollowDemo",
+  "type": "3d",
+  "uuid": "c30b28da-749e-479b-bcb6-cecd8d7be9e3",
+  "version": "3.4.0",
+  "creator": {
+    "version": "3.4.0"
+  }
+}

CameraFollowDemo/settings/1.2.0/packages/builder.json

@@ -0,0 +1,3 @@
+{
+  "__version__": "1.2.4"
+}

CameraFollowDemo/settings/1.2.0/packages/engine.json

@@ -0,0 +1,18 @@
+{
+  "modules": {
+    "cache": {},
+    "includeModules": [
+      "base",
+      "gfx-webgl",
+      "gfx-webgl2",
+      "ui",
+      "particle",
+      "physics-cannon",
+      "physics-framework",
+      "audio",
+      "tween",
+      "terrain"
+    ]
+  },
+  "__version__": "1.0.1"
+}

CameraFollowDemo/settings/1.2.0/packages/project.json

@@ -0,0 +1,7 @@
+{
+  "__version__": "1.0.1",
+  "script": {
+    "useDefineForClassFields": false,
+    "allowDeclareFields": false
+  }
+}

CameraFollowDemo/settings/v2/packages/builder.json

@@ -0,0 +1,3 @@
+{
+  "__version__": "1.3.0"
+}

CameraFollowDemo/settings/v2/packages/engine.json

@@ -0,0 +1,30 @@
+{
+  "modules": {
+    "cache": {},
+    "includeModules": [
+      "base",
+      "gfx-webgl",
+      "gfx-webgl2",
+      "3d",
+      "2d",
+      "ui",
+      "particle",
+      "physics-ammo",
+      "physics-2d-box2d",
+      "intersection-2d",
+      "primitive",
+      "profiler",
+      "particle-2d",
+      "audio",
+      "video",
+      "webview",
+      "tween",
+      "terrain",
+      "tiled-map",
+      "spine",
+      "dragon-bones",
+      "marionette"
+    ]
+  },
+  "__version__": "1.0.5"
+}

CameraFollowDemo/settings/v2/packages/project.json

@@ -0,0 +1,7 @@
+{
+  "__version__": "1.0.1",
+  "script": {
+    "useDefineForClassFields": false,
+    "allowDeclareFields": false
+  }
+}

CameraFollowDemo/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  /* Base configuration. Do not edit this field. */
+  "extends": "./temp/tsconfig.cocos.json",
+
+  /* Add your custom configuration here. */
+  "compilerOptions": {
+    "strict": false
+  }
+}

MovementDemo/settings/v2/packages/cocos-service.json

@@ -0,0 +1,22 @@
+{
+  "game": {
+    "name": "未知游戏",
+    "app_id": "UNKNOW",
+    "c_id": "0"
+  },
+  "appConfigMaps": [
+    {
+      "app_id": "UNKNOW",
+      "config_id": "8a3a56"
+    }
+  ],
+  "configs": [
+    {
+      "app_id": "UNKNOW",
+      "config_id": "8a3a56",
+      "config_name": "Default",
+      "config_remarks": "",
+      "services": []
+    }
+  ]
+}