BabylonJS - 動畫

動畫使場景更具互動性，也使場景更令人印象深刻，賦予其逼真的外觀。現在讓我們詳細瞭解動畫。我們將對形狀應用動畫，使其從一個位置移動到另一個位置。要使用動畫，需要使用所需引數建立動畫物件。

現在讓我們看看相同的語法：

var animationBox = new BABYLON.Animation(
   "myAnimation", 
   "scaling.x", 
   30, 
   BABYLON.Animation.ANIMATIONTYPE_FLOAT, 
   BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE
);

引數

考慮以下與 BabylonJS 動畫相關的引數：

動畫的名稱。
形狀的屬性——例如，縮放、改變位置等。語法中顯示的是縮放；這裡，它將沿 x 軸縮放盒子。
請求的每秒幀數：此動畫中可能的最高 FPS。
在這裡，您決定並輸入將修改哪種型別的數值：是浮點數（例如平移）、向量（例如方向）還是四元數。
確切的值是：

BABYLON.Animation.ANIMATIONTYPE_FLOAT
BABYLON.Animation.ANIMATIONTYPE_VECTOR2
BABYLON.Animation.ANIMATIONTYPE_VECTOR3
BABYLON.Animation.ANIMATIONTYPE_QUATERNION
BABYLON.Animation.ANIMATIONTYPE_COLOR3

動畫行為 - 停止或再次啟動動畫。
使用先前值並遞增：

BABYLON.Animation.ANIMATIONLOOPMODE_RELATIVE

從初始值重新開始：

BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE

保持其最終值

BABYLON.Animation.ANIMATIONLOOPMODE_CONSTANT

現在讓我們建立動畫物件：

var animationBox = new BABYLON.Animation(
   "myAnimation", 
   "scaling.x", 
   30, 
   BABYLON.Animation.ANIMATIONTYPE_FLOAT, 
   BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE
);

動畫演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            scene.clearColor = new BABYLON.Color3(0, 1, 0);
            
            var camera = new BABYLON.ArcRotateCamera("Camera", 1, 0.8, 10, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, true);
            
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene);
            light.intensity = 0.7;	
            
            var pl = new BABYLON.PointLight("pl", BABYLON.Vector3.Zero(), scene);
            pl.diffuse = new BABYLON.Color3(1, 1, 1);
            pl.specular = new BABYLON.Color3(1, 1, 1);
            pl.intensity = 0.8;
            
            var box = BABYLON.Mesh.CreateBox("box", '3', scene);
            box.position = new BABYLON.Vector3(-10,0,0);

            var box1 = BABYLON.Mesh.CreateBox("box1", '3', scene);
            box1.position = new BABYLON.Vector3(0,0,0);

            var animationBox = new BABYLON.Animation("myAnimation", "scaling.x", 30, BABYLON.Animation.ANIMATIONTYPE_FLOAT, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);

            var animationBox1 = new BABYLON.Animation("myAnimation1", "scaling.z", 10, BABYLON.Animation.ANIMATIONTYPE_FLOAT, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);

            // An array with all animation keys
            var keys = []; 

            //At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 1
            });

            //At the animation key 20, the value of scaling is "0.2"
            keys.push({
               frame: 20,
               value: 0.2
            });

            keys.push({
               frame: 60,
               value: 0.4
            });

            //At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 1
            });
            
            animationBox.setKeys(keys);
            box.animations = [];
            box.animations.push(animationBox);			
            scene.beginAnimation(box, 0, 100, true); 

            // An array with all animation keys
            var keys = []; 

            //At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 1
            });

            //At the animation key 20, the value of scaling is "0.2"
            keys.push({
               frame: 60,
               value: 0.2
            });

            //At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 1
            });
            animationBox1.setKeys(keys);
            box1.animations = [];
            box1.animations.push(animationBox1);			
            scene.beginAnimation(box1, 0, 100, true); 
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

// An array with all animation keys
var keys = []; 

//At the animation key 0, the value of scaling is "1"
keys.push({
   frame: 0,
   value: 1
});

//At the animation key 20, the value of scaling is "0.2"
keys.push({
   frame: 20,
   value: 0.2
});

//At the animation key 100, the value of scaling is "1"
keys.push({
   frame: 100,
   value: 1
});

animationBox.setKeys(keys);

box.animations = [];

box.animations.push(animationBox);

scene.beginAnimation(box, 0, 100, true); //defines the start and the end on the target shape box.

以下是動畫物件上可用的其他函式：

pause()
restart()
stop()
reset()

我們可以將beginAnimation引用儲存在一個變數中，並使用該引用來停止、暫停或重置動畫。

var newAnimation = scene.beginAnimation(box1, 0, 100, true);

例如：

newAnimation.pause();

動畫物件上有一些函式可用於控制關鍵幀。

BABYLON.Animation.prototype.floatInterpolateFunction = function (startValue, endValue, gradient) {
   return startValue + (endValue - startValue) * gradient;
};

BABYLON.Animation.prototype.quaternionInterpolateFunction = function (startValue, endValue, gradient) {
   return BABYLON.Quaternion.Slerp(startValue, endValue, gradient);
};

BABYLON.Animation.prototype.vector3InterpolateFunction = function (startValue, endValue, gradient) {
   return BABYLON.Vector3.Lerp(startValue, endValue, gradient);
};

以下是您可以更改的函式列表：

floatInterpolateFunction
quaternionInterpolateFunction
quaternionInterpolateFunctionWithTangents
vector3InterpolateFunction
vector3InterpolateFunctionWithTangents
vector2InterpolateFunction
vector2InterpolateFunctionWithTangents
sizeInterpolateFunction
color3InterpolateFunction
matrixInterpolateFunction

要建立快速動畫，可以使用一個可以直接使用的函式。

例如：

Animation.CreateAndStartAnimation = function(name, mesh, tartgetProperty, framePerSecond, totalFrame, from, to, loopMode);

在這裡，您只能使用 2 個關鍵幀 - 開始和結束。

演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            scene.clearColor = new BABYLON.Color3(0, 1, 0);
            
            var camera = new BABYLON.ArcRotateCamera("Camera", 1, 0.8, 10, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, true);
            
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene);
            light.intensity = 0.7;	
            
            var pl = new BABYLON.PointLight("pl", BABYLON.Vector3.Zero(), scene);
            pl.diffuse = new BABYLON.Color3(1, 1, 1);
            pl.specular = new BABYLON.Color3(1, 1, 1);
            pl.intensity = 0.8;
            
            var box = BABYLON.Mesh.CreateBox("box", '3', scene);
            box.position = new BABYLON.Vector3(0,0,0);
            BABYLON.Animation.CreateAndStartAnimation('boxscale', box, 'scaling.x', 30, 120, 1.0, 1.5);  
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

動畫混合

您可以藉助 enableBlending = true; 實現動畫混合；

此混合動畫將從當前物件狀態更改。

緩動函式

為了使動畫更令人印象深刻，有一些緩動函式，我們之前已經在 css 中使用過。

以下是緩動函式列表：

BABYLON.CircleEase ()
BABYLON.BackEase (amplitude)
BABYLON.BounceEase (bounces, bounciness)
BABYLON.CubicEase ()
BABYLON.ElasticEase (oscillations, springiness)
BABYLON.ExponentialEase (exponent)
BABYLON.PowerEase (power)
BABYLON.QuadraticEase ()
BABYLON.QuarticEase ()
BABYLON.QuinticEase ()
BABYLON.SineEase ()

演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            scene.clearColor = new BABYLON.Color3(0, 1, 0);
            
            var camera = new BABYLON.ArcRotateCamera("Camera", 1, 0.8, 10, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, true);
            
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene);
            light.intensity = 0.7;	
            
            var pl = new BABYLON.PointLight("pl", BABYLON.Vector3.Zero(), scene);
            pl.diffuse = new BABYLON.Color3(1, 1, 1);
            pl.specular = new BABYLON.Color3(1, 1, 1);
            pl.intensity = 0.8;

            var box1 = BABYLON.Mesh.CreateTorus("torus", 5, 1, 10, scene, false);
            box1.position = new BABYLON.Vector3(0,0,0);

            var animationBox1 = new BABYLON.Animation("myAnimation1", "scaling.z", 10, BABYLON.Animation.ANIMATIONTYPE_FLOAT, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);

            // An array with all animation keys
            var keys = []; 

            //At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 1
            });

            //At the animation key 20, the value of scaling is "0.2"
            keys.push({
               frame: 60,
               value: 0.2
            });

            //At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 1
            });
            
            animationBox1.setKeys(keys);
            box1.animations = [];
            // box1.animations.push(animationBox1);		

            var easingFunction = new BABYLON.QuarticEase();
            easingFunction.setEasingMode(BABYLON.EasingFunction.EASINGMODE_EASEINOUT);

            animationBox1.setEasingFunction(easingFunction);
            box1.animations.push(animationBox1);
            scene.beginAnimation(box1, 0, 100, true); 
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

動畫事件

您可以在動畫事件上執行任何必要的操作。如果要在更改幀或動畫完成後更改任何內容，可以透過向動畫新增事件來實現。

var event1 = new BABYLON.AnimationEvent(50, function() { console.log("Yeah!"); }, true);
// You will get hte console.log when the frame is changed to 50 using animation.

animation.addEvent(event1); //attaching event to the animation.

BabylonJS - 精靈

在計算機圖形學中，精靈指的是什麼？它基本上是一個二維點陣圖，整合到更大的場景中。當多個較小的影像組合成一個位圖以節省記憶體時，生成的影像稱為精靈表。讓我們開始使用精靈以及如何使用它們。

開始使用精靈的第一步是建立一個精靈管理器。

var spriteManagerTrees = new BABYLON.SpriteManager("treesManagr", "Assets/Palm-arecaceae.png", 2000, 800, scene);

考慮以下引數來建立精靈管理器：

名稱 - 此管理器的名稱。
URL - 要使用的影像 url。
管理器的容量 - 此管理器中的最大例項數。例如，上述例項將建立 2000 棵樹。
單元格大小 - 影像佔據的大小。
場景 - 將新增管理器的場景。

var spriteManagerPlayer = new BABYLON.SpriteManager("playerManagr","Assets/Player.png", 2, 64, scene);

看一下上面的物件。我們提供了一個玩家影像，現在正在建立它的 2 個例項。影像的大小是 64。精靈的每個影像都必須包含在一個 64 畫素的正方形中，不多不少。

現在讓我們建立連結到精靈管理器的相同例項。

var player = new BABYLON.Sprite("player", spriteManagerPlayer);

您可以像其他任何形狀或網格一樣使用此播放器物件。您可以分配位置、大小、角度等。

player.size = 0.3;
player.angle = Math.PI/4;
player.invertU = -1;
player.width = 0.3;
player.height = 0.4;

演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            //scene.clearColor = new BABYLON.Color3(0, 1, 0);	
            // Create camera and light
            var light = new BABYLON.PointLight("Point", new BABYLON.Vector3(5, 10, 5), scene);
            
            var camera = new BABYLON.ArcRotateCamera("Camera", 1, 0.8, 8, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, true);

            var spriteManagerTrees = new BABYLON.SpriteManager("trees", "images/tree.png", 1000, 400, scene);	

            for (var i = 0; i < 1000; i++) {
               var tree = new BABYLON.Sprite("tree", spriteManagerTrees);
               tree.position.x = Math.random() * 100 - 50;
               tree.position.z = Math.random() * 100 - 50;
               tree.isPickable = true;

               //Some "dead" trees
               if (Math.round(Math.random() * 5) === 0) {
                  tree.angle = Math.PI * 90 / 180;
                  tree.position.y = -0.3;
               }
            }

            var spriteManagerTrees1 = new BABYLON.SpriteManager("trees1", "images/tree1.png", 1000,400, scene);	

            for (var i = 0; i < 1000; i++) {
               var tree1 = new BABYLON.Sprite("tree1", spriteManagerTrees1);       
               if (i %2 == 0) {
               tree1.position.x = Math.random() * 100 - 50;			
               } else {
                  tree1.position.z = Math.random() * 100 - 50;
               }
               tree1.isPickable = true;
            }

            spriteManagerTrees.isPickable = true;
            spriteManagerTrees1.isPickable = true;

            var spriteManagerPlayer = new BABYLON.SpriteManager("playerManager", "images/bird.png", 2, 200, scene);
            
            var player = new BABYLON.Sprite("player", spriteManagerPlayer);
            player.position.x = 2;
            player.position.y = 2;	
            player.position.z = 0;	


            var spriteManagerPlayer1 = new BABYLON.SpriteManager("playerManager1", "images/bird.png", 2, 200, scene);
            
            var player1 = new BABYLON.Sprite("player", spriteManagerPlayer1);
            player1.position.x = 1;
            player1.position.y = 2;	
            player1.position.z = 0;	

            var spriteManagerPlayer2 = new BABYLON.SpriteManager("playerManager2", "images/bird.png", 2, 200, scene);
            
            var player2 = new BABYLON.Sprite("player", spriteManagerPlayer2);
            player2.position.x = 0;
            player2.position.y = 1;	
            player2.position.z = 0;	

            scene.onPointerDown = function (evt) {
               var pickResult = scene.pickSprite(this.pointerX, this.pointerY);
               if (pickResult.hit) {
                  pickResult.pickedSprite.angle += 1;
               }
            };
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

在此演示中，我們使用了名為 tree.png、tree1.png 的影像來顯示樹木，bird.png 來顯示場景中的鳥。這些影像儲存在本地 images/ 資料夾中，並也在下面貼上以供參考。您可以下載任何您選擇的影像並在演示連結中使用。

用於樹的影像如下所示。

images/tree.png

images/tree1.png

images/bird.png

現在讓我們再看一個帶有精靈氣球的演示。

帶有精靈氣球的演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height:100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);

            var light = new BABYLON.PointLight("Point", new BABYLON.Vector3(5, 10, 5), scene);
            
            var camera = new BABYLON.ArcRotateCamera("Camera", -3.4, 1.0, 82, new BABYLON.Vector3(0, -15, 0), scene);
            camera.setPosition(new BABYLON.Vector3(30, 0,100));
            camera.attachControl(canvas, true);
            
            var spriteManagerTrees = new BABYLON.SpriteManager("trees", "images/balloon.png", 50, 450, scene);	

            var treearray = [];
            for (var i = 0; i < 50; i++) {
               var tree = new BABYLON.Sprite("tree", spriteManagerTrees);
               tree.position.x = Math.random() * 100 - 10;
               tree.position.z = Math.random() * 100 - 10;
               tree.position.y = -35;
               tree.isPickable = true;       
               treearray.push(tree);
            }

            spriteManagerTrees.isPickable = true;
            scene.onPointerDown = function (evt) {
               var pickResult = scene.pickSprite(this.pointerX, this.pointerY);
               if (pickResult.hit) {
                  pickResult.pickedSprite.position.y = -3000;			
               }
            };
            
            k = -35;
            var animate = function() {
               if (k > 3) return;
               k += 0.05;
               for (var i = 0; i < treearray.length; i++) {
                  treearray[i].position.y = k;
               }
            };
            scene.registerBeforeRender(animate);
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

在此演示中，我們使用了名為 ballon.png 的影像。這些影像儲存在本地 images/ 資料夾中，並也在下面貼上以供參考。您可以下載任何您選擇的影像並在演示連結中使用。

images/balloon.png

氣球將升到空中，一旦它們停止，您可以點選它們，它們就會消失。這是使用 pickSprite 函式完成的，該函式在點選建立的精靈時提供詳細資訊。

當滑鼠操作發生時，呼叫 onPointerDown 函式，並更改精靈的位置。

var animate = function() {
   if (k > 3) return;
   k += 0.05;
   for (var i = 0; i < treearray.length; i++) {
      treearray[i].position.y = k;
   }
};
scene.registerBeforeRender(animate);

animate 函式在 registerBeforeRender 中呼叫，它負責將氣球從初始 -35 移動到 +3。透過將其遞增 0.05 來緩慢移動它。

BabylonJS - 粒子

粒子系統是計算機圖形學中的一種技術，它使用大量非常小的精靈、3D 模型或其他圖形物件來模擬某些型別的“模糊”現象，否則很難用傳統的渲染技術再現。

要建立粒子系統，您必須按如下方式呼叫類：

var particleSystem = new BABYLON.ParticleSystem("particles", 2000, scene);//2000 refers to the total number of particles to be produced.

粒子系統需要考慮以下屬性：

particleSystem.particleTexture = new BABYLON.Texture("Flare.png", scene);
particleSystem.textureMask = new BABYLON.Color4(0.1, 0.8, 0.8, 1.0);
particleSystem.emitter = fountain
particleSystem.color1 = new BABYLON.Color4(0.7, 0.8, 1.0, 1.0);
particleSystem.color2 = new BABYLON.Color4(0.2, 0.5, 1.0, 1.0);
particleSystem.colorDead = new BABYLON.Color4(0, 0, 0.2, 0.0);

發射器屬性採用必須從中發射粒子的網格。color1 和 color2 是粒子的顏色。

ColorDead 是在粒子從場景中消失之前應用於粒子的顏色，因此稱為 colorDead。

particleSystem.minSize = 0.1;
particleSystem.maxSize = 0.5;
particleSystem.minLifeTime = 0.3;
particleSystem.maxLifeTime = 1.5;

MinSize 和 maxSize 是賦予粒子的尺寸。MinlifeTime 和 maxLifeTime 是賦予粒子的壽命。

particleSystem.emitRate = 1500;

emitRate 是發射粒子的速率。

我們在下面顯示的演示中使用了環面。我們使用了粒子系統及其屬性來獲取環面周圍的所有粒子。

演示 1

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Basic Element-Creating Scene</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            // Setup environment
            
            var light0 = new BABYLON.PointLight("Omni", new BABYLON.Vector3(0, 2, 8), scene);
            
            var camera = new BABYLON.ArcRotateCamera("ArcRotateCamera", 1, 0.8, 20, new BABYLON.Vector3(0, 0, 0), scene);
            camera.attachControl(canvas, true);

            var fountain = BABYLON.Mesh.CreateTorus("torus", 2, 1, 8, scene, false);
            
            var particleSystem = new BABYLON.ParticleSystem("particles", 2000, scene);
            particleSystem.particleTexture = new BABYLON.Texture("images/dot.jpg", scene);

            particleSystem.textureMask = new BABYLON.Color4(0.1, 0.8, 0.8, 1.0);
            particleSystem.emitter = fountain;


            particleSystem.minEmitBox = new BABYLON.Vector3(-1, 0, 0); // Starting all from
            particleSystem.maxEmitBox = new BABYLON.Vector3(1, 0, 0); // To...

            particleSystem.color1 = new BABYLON.Color4(0.7, 0.8, 1.0, 1.0);
            particleSystem.color2 = new BABYLON.Color4(0.2, 0.5, 1.0, 1.0);
            particleSystem.colorDead = new BABYLON.Color4(0, 0, 0.2, 0.0);

            particleSystem.minSize = 0.1;
            particleSystem.maxSize = 0.5;

            particleSystem.minLifeTime = 0.3;
            particleSystem.maxLifeTime = 1.5;

            particleSystem.emitRate = 1500;

            particleSystem.blendMode = BABYLON.ParticleSystem.BLENDMODE_ONEONE;

            particleSystem.gravity = new BABYLON.Vector3(0, -9.81, 0);

            particleSystem.direction1 = new BABYLON.Vector3(-7, 8, 3);
            particleSystem.direction2 = new BABYLON.Vector3(7, 8, -3);


            particleSystem.minAngularSpeed = 0;
            particleSystem.maxAngularSpeed = Math.PI;

            particleSystem.minEmitPower = 1;
            particleSystem.maxEmitPower = 3;
            particleSystem.updateSpeed = 0.005;

            particleSystem.start();
            var keys = [];
            var animation = new BABYLON.Animation("animation", "rotation.x", 30, BABYLON.Animation.ANIMATIONTYPE_FLOAT,
                                   BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);
            
            // At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 0
            });

            // At the animation key 50, the value of scaling is "0.2"
            keys.push({
               frame: 50,
               value: Math.PI
            });

            // At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 0
            });

            // Launch animation
            animation.setKeys(keys);
            fountain.animations.push(animation);
            scene.beginAnimation(fountain, 0, 100, true);
            return scene;
         }
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });	
      </script>
   </body>
</html>

輸出

以上程式碼行生成以下輸出：

在此演示中，我們使用了名為 dot.jpg 的影像。這些影像儲存在本地 images/ 資料夾中，並也在下面貼上以供參考。您可以下載任何您選擇的影像並在演示連結中使用。

以下是用於粒子紋理的影像：images/dot.jpg

演示 2

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Ball/Ground Demo</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            scene.clearColor = new BABYLON.Color3( .5, .5, .5);
            
            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(0, 0, -0), scene);
            camera.setPosition(new BABYLON.Vector3(-100, 0,-100));
            camera.attachControl(canvas, true);
            
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);
            var pl = new BABYLON.PointLight("pl", new BABYLON.Vector3(0, 0, 0), scene);

            var gmat = new BABYLON.StandardMaterial("mat1", scene);
            gmat.alpha = 1.0;
            
            var ground =  BABYLON.Mesh.CreateGround("ground", 100, 100, 20, scene);
            ground.material = gmat;
            gmat.wireframe = true;

            var particleSystem = new BABYLON.ParticleSystem("particles", 2000, scene);
            particleSystem.particleTexture = new BABYLON.Texture("images/dot.jpg", scene);

            particleSystem.textureMask = new BABYLON.Color4(0.1, 0.8, 0.8, 1.0);
            particleSystem.emitter = ground;

            particleSystem.minEmitBox = new BABYLON.Vector3(-1, 0, 0); // Starting all from
            particleSystem.maxEmitBox = new BABYLON.Vector3(1, 0, 0); // To...

            particleSystem.color1 = new BABYLON.Color4(0.7, 0.8, 1.0, 1.0);
            particleSystem.color2 = new BABYLON.Color4(0.2, 0.5, 1.0, 1.0);
            particleSystem.colorDead = new BABYLON.Color4(0, 0, 0.2, 0.0);

            particleSystem.minSize = 0.1;
            particleSystem.maxSize = 0.5;

            particleSystem.minLifeTime = 0.3;
            particleSystem.maxLifeTime = 1.5;

            particleSystem.emitRate = 1500;

            particleSystem.blendMode = BABYLON.ParticleSystem.BLENDMODE_ONEONE;

            particleSystem.gravity = new BABYLON.Vector3(0, -9.81, 0);

            particleSystem.direction1 = new BABYLON.Vector3(-7, 8, 3);
            particleSystem.direction2 = new BABYLON.Vector3(7, 8, -3);

            particleSystem.minAngularSpeed = 0;
            particleSystem.maxAngularSpeed = Math.PI;

            particleSystem.minEmitPower = 1;
            particleSystem.maxEmitPower = 3;
            particleSystem.updateSpeed = 0.005;

            particleSystem.start();


            var keys = [];
            var animation = new BABYLON.Animation("animation", "rotation.x", 30, BABYLON.Animation.ANIMATIONTYPE_FLOAT,
                           BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);

            // At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 0
            });

            // At the animation key 50, the value of scaling is "0.2"
            keys.push({
               frame: 50,
               value: Math.PI
            });

            // At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 0
            });

            // Launch animation
            animation.setKeys(keys);
            ground.animations.push(animation);
            
            //scene.beginAnimation(ground, 0, 100, true);
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

帶有動畫的演示

<!doctype html>
<html>
   <head>
      <meta charset = "utf-8">
      <title>BabylonJs - Ball/Ground Demo</title>
      <script src = "babylon.js"></script>
      <style>
         canvas {width: 100%; height: 100%;}
      </style>
   </head>

   <body>
      <canvas id = "renderCanvas"></canvas>
      <script type = "text/javascript">
         var canvas = document.getElementById("renderCanvas");
         var engine = new BABYLON.Engine(canvas, true);
         
         var createScene  = function() {
            var scene = new BABYLON.Scene(engine);
            scene.clearColor = new BABYLON.Color3( .5, .5, .5);
            
            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(0, 0, -0), scene);
            camera.setPosition(new BABYLON.Vector3(-100, 0, -100));
            camera.attachControl(canvas, true);
            
            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);
            var pl = new BABYLON.PointLight("pl", new BABYLON.Vector3(0, 0, 0), scene);

            var gmat = new BABYLON.StandardMaterial("mat1", scene);
            gmat.alpha = 1.0;
            
            var ground =  BABYLON.Mesh.CreateGround("ground", 100, 100, 20, scene);
            ground.material = gmat;
            gmat.wireframe = true;

            var particleSystem = new BABYLON.ParticleSystem("particles", 2000, scene);
            particleSystem.particleTexture = new BABYLON.Texture("images/dot.jpg", scene);

            particleSystem.textureMask = new BABYLON.Color4(0.1, 0.8, 0.8, 1.0);
            particleSystem.emitter = ground;

            particleSystem.minEmitBox = new BABYLON.Vector3(-1, 0, 0); // Starting all from
            particleSystem.maxEmitBox = new BABYLON.Vector3(1, 0, 0); // To...

            particleSystem.color1 = new BABYLON.Color4(0.7, 0.8, 1.0, 1.0);
            particleSystem.color2 = new BABYLON.Color4(0.2, 0.5, 1.0, 1.0);
            particleSystem.colorDead = new BABYLON.Color4(0, 0, 0.2, 0.0);

            particleSystem.minSize = 0.1;
            particleSystem.maxSize = 0.5;

            particleSystem.minLifeTime = 0.3;
            particleSystem.maxLifeTime = 1.5;

            particleSystem.emitRate = 1500;

            particleSystem.blendMode = BABYLON.ParticleSystem.BLENDMODE_ONEONE;

            particleSystem.gravity = new BABYLON.Vector3(0, -9.81, 0);//gravity for the particle.

            particleSystem.direction1 = new BABYLON.Vector3(-7, 8, 3);
            particleSystem.direction2 = new BABYLON.Vector3(7, 8, -3);
            
            //random direction for the particles on the scene
            particleSystem.minAngularSpeed = 0;
            particleSystem.maxAngularSpeed = Math.PI;
            particleSystem.minEmitPower = 1;
            particleSystem.maxEmitPower = 3;
            particleSystem.updateSpeed = 0.005;

            particleSystem.start();

            var keys = [];
            var animation = new BABYLON.Animation("animation", "rotation.x", 30, BABYLON.Animation.ANIMATIONTYPE_FLOAT,
                           BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE);
            
            // At the animation key 0, the value of scaling is "1"
            keys.push({
               frame: 0,
               value: 0
            });

            // At the animation key 50, the value of scaling is "0.2"
            keys.push({
               frame: 50,
               value: Math.PI
            });

            // At the animation key 100, the value of scaling is "1"
            keys.push({
               frame: 100,
               value: 0
            });

            // Launch animation
            animation.setKeys(keys);
            ground.animations.push(animation);
            scene.beginAnimation(ground, 0, 100, true); 
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

輸出

以上程式碼行生成以下輸出：

說明

上述演示顯示了一個帶有線框材質的地面，並且粒子系統是從中心產生的。

列印頁面