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    當前位置: 首頁 > 售后 > 藝源智庫
    【小程序】小程序?小故事(16)——小游戲渲染
    時間:2018-07-26 15:30:19
    文章發布:杜凱
    原創作者:文雨晨
    來源:微信開發者

    《跳一跳》小游戲在 2017年12月28日正式發布,一周內 DAU 突破一億,為小游戲開放生態贏得口碑。它操作簡單,節奏輕快,憑借著快速復活機制以及強大的社交屬性掀起了一股全民潮流。


    其實,這個小游戲里僅有兩個元素,黑色小人和各色基座。游戲規則也很簡單,起跳前,小黑人壓縮自己的身體來蓄力,根據蓄力時間決定距離來跳到下一個基座上。

     

    今天的小故事,想要跟大家分享小游戲的渲染能力,我們以跳一跳唱片機為例,簡要介紹一下如何展現一個三維物體~ ( 3D渲染引擎選用 Three.js )




    步驟一

    創建一個場景 Scene


    游戲的容器,用來放置光源,照相機和唱片機。


    let scene = new THREE.Scene()


    步驟二

    選擇合適的照相機 Camera


    抽象來說,照相機定義了三維空間到二維屏幕的投影方式。


    因投影方式不同,相機又分為透視投影相機正交投影相機。


    透視投影中的四棱柱和正交投影中的立方體被稱為視景體,它是三維世界里屏幕上可見的區域,也就是照相機的視野。


    視景體外的物體會被剪裁掉不參與渲染。透視投影更接近真實世界,有近大遠小的感覺。而正交投影將物體以原比例平行投影到近剪裁面上,不會有大小縮放。


    在跳一跳中我們使用了正交投影相機。



    let camera = new THREE.OrthographicCamera( width / - 2, width / 2, height / 2, height / - 2, near, far )


    步驟三

    創建光源 light


    let ambientLight = new THREE.AmbientLight(0xffffff, 0.8);

    let directionalLight = new THREE.DirectionalLight(0xffffff, 0.28);


    創建一個環境光和直射光, 環境光沒有特定光源,它將光線均勻照射在場景中。直射光模擬真實世界太陽光。


    步驟四

    定義幾何體 Geometry,

    材質 Material,合成 Mesh


    Geometry 幾何體,定義了一個物體的形狀,包含頂點,線,面和法向量等信息。


    let boxGeometry = new THREE.BoxGeometry(2, 2, 2)


    對于唱片機我們創建了三個幾何體,兩個長方體和一個圓柱體。



    Material 材質,定義了一個物體的外觀,例如顏色,透明度,光照屬性,融合模式。

     

    頂部透明蓋子,底座和唱片的使用的Lambert材質,這種材質只考慮漫反射而不考慮鏡面反射, 通常用于創建較暗淡無高光的物體, 其中 texture 是紋理貼圖,我們通過紋理映射將這個二維圖像貼到三維的方塊上。


    let transparentMaterial = new THREE.MeshLambertMaterial({ color: ‘white’, transparent: true, opacity: 0.5, map: texture })


    我們通過 Mesh 我們將材質應用到幾何體上。



    小程序開發
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