175 lines
5.4 KiB
Markdown
175 lines
5.4 KiB
Markdown
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* 草动画(GrassMesh)
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* 用来模拟实现风吹草动的效果；
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* 加入受角色对草产生的挤压效果；
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* 结合Egret3D的地形数据，可以通过Unity4导出场景中的草模型；
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* GrassMethod由GrassMesh自动生成，不建议您在外部创建这个对象。
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----------
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module egret3d {
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export class Class_GrassMesh extends Class_View3D {
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protected view1: View3D;
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protected cameraCrl: LookAtController;
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private _grass: GrassMesh;
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private _lightFromBall: Mesh;
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private _lightVector: Vector3D;
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constructor() {
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super();
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this._egret3DCanvas.addEventListener(Event3D.ENTER_FRAME, this.update, this);
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this.view1 = new View3D(0, 0, window.innerWidth * window.devicePixelRatio, window.innerHeight * window.devicePixelRatio);
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this.view1.backColor = 0xff000000;
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this._egret3DCanvas.addView3D(this.view1);
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var bgImg: HTMLImageElement = <HTMLImageElement>document.getElementById("bg");
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var tex: ImageTexture = new ImageTexture(bgImg);
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this.cameraCrl = new LookAtController(this.view1.camera3D, new Object3D());
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this.cameraCrl.distance = 600;
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this.cameraCrl.rotationX = 60;
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this._lightFromBall = new Mesh(new SphereGeometry(20));
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this.view1.addChild3D(this._lightFromBall);
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this.initGrass();
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}
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private parseDistribution(image:ImageData): Vector3D[] {
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var width: number = image.width;
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var height: number = image.height;
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var color: number;
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var offset: number;
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var ratio: number = 1 / 16;
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var positions: Vector3D[] = [];
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for (var i: number = 0; i < width; i++) {
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for (var j: number = 0; j < height; j++) {
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offset = i * width + j;
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offset *= 4;
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color = image.data[offset] * ratio;
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color = Math.round(color);
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if (color > 0) {
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this.getPosition(i, j, color, positions);
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}
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}
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}
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return positions;
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}
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private getPosition(i: number, j: number, count: number, positions: Vector3D[]): void {
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var pos: Vector3D;
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for (var i: number = 0; i < count; i++) {
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//随机一个值
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pos = new Vector3D(i, 0, j);
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positions.push(pos);
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}
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}
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private initGrass(): void {
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var positions: Vector3D[] = this.createPositions();
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var mat: TextureMaterial = new TextureMaterial();
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mat.ambientColor = 0xffffff;
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mat.blendMode = BlendMode.NORMAL;
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mat.cutAlpha = 0.4;
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var data: GrassData = new GrassData();
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data.minWidth = 30;
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data.maxWidth = 70;
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data.minHeight = 30;
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data.maxHeight = 70;
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data.noiseSpread = 1;
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data.billboard = false;
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data.healthyColor = "0x00ff00";
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data.dryColor = "0xff8000";
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this._grass = new GrassMesh(positions, mat, data);
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this._grass.y = 20;
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this.view1.addChild3D(this._grass);
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var loadtex: URLLoader = new URLLoader("resource/scene/plant/leaf.png");
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loadtex.addEventListener(LoaderEvent3D.LOADER_COMPLETE, this.onLoadTexture, this);
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loadtex["mat"] = mat;
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}
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private createPositions(): Vector3D[] {
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var plane: PlaneValueShape = new PlaneValueShape();
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plane.width = 1000;
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plane.height = 1000;
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var positions: Vector3D[] = plane.calculate(1000);
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return positions;
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}
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protected onLoadTexture(e: LoaderEvent3D) {
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e.loader["mat"].diffuseTexture = e.loader.data;
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}
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private anlge: number = 0;
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private dirLight: DirectLight;
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private position: Vector3D = new Vector3D();
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public update(e: Event3D) {
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this.cameraCrl.update();
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this.anlge += 0.01;
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this.position.setTo(Math.sin(this.anlge) * 300, 10, Math.cos(this.anlge) * 300);
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this._lightFromBall.position = this.position;
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if (this._grass) {
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this._grass.method.updateSqueezeData(this.position, true, 60, 1);
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}
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}
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}
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}
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示例展示为草动画受小球的挤压影响效果
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----------
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* Unity中导出草的步骤：
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* 创建地形对象
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* 使Terrain处于选中状态，点击草的图标，获得当前为刷草模式
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* 点击Edit Details进入草动画详细编辑模式
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* 点击Add Grass Texture获得新建一组草的动画
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* 在弹开的编辑草详细内容界面中，编辑贴图，调整各个属性，完成后点击Add按钮，草动画详细信息确认成功
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* 于场景中地形区域，按住鼠标不放松，然后滑动鼠标，开始执行刷草
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* 编辑完毕后，使用Egret3D提供的场景导出插件，导出当前场景。
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* 最后用Egret3D的UnitLoader加载这个场景，查看草的动画。
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