BabylonJS - VectorPosition和Rotation

在浏览器中运行下面给出的演示链接.在下面给出的演示中，我们绘制了x，y和z轴.在正，负方向上的x，y和z轴上绘制了数字.在浏览器中运行相同的代码，根据需要更改值并绘制形状，网格，定位它们并查看它们在x，y和z轴上的呈现方式.使用x，y和z轴上提到的数字，看看如何完成网格的定位会很有帮助.

演示

                                                      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);            // camera            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(5, 3, 0), scene);            camera.setPosition(new BABYLON.Vector3(5, 10, -10));            camera.attachControl(canvas, true);                        // lights            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);            light.intensity = 0.8;            var spot = new BABYLON.SpotLight(               "spot",                new BABYLON.Vector3(25, 15, -10),                new BABYLON.Vector3(-1, -0.8, 1), 15, 1, scene);            spot.diffuse = new BABYLON.Color3(1, 1, 1);            spot.specular = new BABYLON.Color3(0, 0, 0);            spot.intensity = 0.2;                         // material            var mat = new BABYLON.StandardMaterial("mat1", scene);            mat.alpha = 1.0;            mat.diffuseColor = new BABYLON.Color3(0.5, 0.5, 1.0);            mat.backFaceCulling = false;            //mat.wireframe = true;            // show axis            var showAxis = function(size) {               var makeTextPlane = function(text, color, size) {                  var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);                  dynamicTexture.hasAlpha = true;                  dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);                                    var plane = new BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);                  plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);                  plane.material.backFaceCulling = false;                                    plane.material.specularColor = new BABYLON.Color3(0, 0, 0);                  plane.material.diffuseTexture = dynamicTexture;                  return plane;               };               var axisX = BABYLON.Mesh.CreateLines("axisX", [                   new BABYLON.Vector3(-size * 0.95, 0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                   new BABYLON.Vector3(-size * 0.95, -0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                  new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, 0.05 * size, 0),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)               ], scene);                              axisX.color = new BABYLON.Color3(1, 0, 0);               var xChar = makeTextPlane("X", "red", size / 10);               xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);               var xChar1 = makeTextPlane("-X", "red", size / 10);               xChar1.position = new BABYLON.Vector3(-0.9 * size, 0.05 * size, 0);               var axisY = BABYLON.Mesh.CreateLines("axisY", [                  new BABYLON.Vector3( -0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                  new BABYLON.Vector3(0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( -0.05 * size, size * 0.95, 0),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)               ], scene);                              axisY.color = new BABYLON.Color3(0, 1, 0);               var yChar = makeTextPlane("Y", "green", size / 10);               yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);               var yChar1 = makeTextPlane("-Y", "green", size / 10);               yChar1.position = new BABYLON.Vector3(0, -0.9 * size, 0.05 * size);               var axisZ = BABYLON.Mesh.CreateLines("axisZ", [                  new BABYLON.Vector3( 0 , -0.05 * size, -size * 0.95),                   new BABYLON.Vector3(0, 0, -size),                  new BABYLON.Vector3( 0 , 0.05 * size, -size * 0.95),                  new BABYLON.Vector3(0, 0, -size),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95),                  new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)               ], scene);                              axisZ.color = new BABYLON.Color3(0, 0, 1);               var zChar = makeTextPlane("Z", "blue", size / 10);               zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);               var zChar1 = makeTextPlane("-Z", "blue", size / 10);               zChar1.position = new BABYLON.Vector3(0, 0.05 * size, -0.9 * size);            };            showAxis(10);            return scene;         };         var scene = createScene();         engine.runRenderLoop(function() {            scene.render();         });         

输出

让我们沿x，y和z轴定义坐标.

演示

                                                      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);            // camera            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(5, 3, 0), scene);            camera.setPosition(new BABYLON.Vector3(5, 10, -10));            camera.attachControl(canvas, true);                        // lights            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);            light.intensity = 0.8;            var spot = new BABYLON.SpotLight(               "spot", new BABYLON.Vector3(25, 15, -10),                new BABYLON.Vector3(-1, -0.8, 1), 15, 1, scene);            spot.diffuse = new BABYLON.Color3(1, 1, 1);            spot.specular = new BABYLON.Color3(0, 0, 0);            spot.intensity = 0.2;                         // material            var mat = new BABYLON.StandardMaterial("mat1", scene);            mat.alpha = 1.0;            mat.diffuseColor = new BABYLON.Color3(0.5, 0.5, 1.0);            mat.backFaceCulling = false;                        //mat.wireframe = true;            var makeTextPlane = function(text, color, size) {               var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);               dynamicTexture.hasAlpha = true;               dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);                              var plane = new BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);               plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);               plane.material.backFaceCulling = false;               plane.material.specularColor = new BABYLON.Color3(0, 0, 0);               plane.material.diffuseTexture = dynamicTexture;               return plane;            };                        // show axis            var showAxis = function(size) {               var axisX = BABYLON.Mesh.CreateLines("axisX", [                   new BABYLON.Vector3(-size * 0.95, 0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                   new BABYLON.Vector3(-size * 0.95, -0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                  new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, 0.05 * size, 0),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)               ], scene);               axisX.color = new BABYLON.Color3(1, 0, 0);               var xChar = makeTextPlane("X", "red", size / 10);               xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);               var xChar1 = makeTextPlane("-X", "red", size / 10);               xChar1.position = new BABYLON.Vector3(-0.9 * size, 0.05 * size, 0);               var xcor = [];               for (i =- 10; i <= 10; i++) {                  xcor[i] = makeTextPlane(i, "red", size / 10);                  xcor[i].position = new BABYLON.Vector3(i, 0, 0);               }               var axisY = BABYLON.Mesh.CreateLines("axisY", [                  new BABYLON.Vector3( -0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                  new BABYLON.Vector3(0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( -0.05 * size, size * 0.95, 0),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)               ], scene);                              axisY.color = new BABYLON.Color3(0, 1, 0);               var yChar = makeTextPlane("Y", "green", size / 10);               yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);               var yChar1 = makeTextPlane("-Y", "green", size / 10);               yChar1.position = new BABYLON.Vector3(0, -0.9 * size, 0.05 * size);               var ycor = [];               for (y=-10;y<=10;y++) {                  xcor[y] = makeTextPlane(y, "green", size / 10);                  xcor[y].position = new BABYLON.Vector3(0, y, 0);               }               var axisZ = BABYLON.Mesh.CreateLines("axisZ", [                  new BABYLON.Vector3( 0 , -0.05 * size, -size * 0.95),                   new BABYLON.Vector3(0, 0, -size),                  new BABYLON.Vector3( 0 , 0.05 * size, -size * 0.95),                  new BABYLON.Vector3(0, 0, -size),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95),                  new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)               ], scene);                              axisZ.color = new BABYLON.Color3(0, 0, 1);               var zChar = makeTextPlane("Z", "blue", size / 10);               zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);               var zChar1 = makeTextPlane("-Z", "blue", size / 10);               zChar1.position = new BABYLON.Vector3(0, 0.05 * size, -0.9 * size);               var zcor = [];               for (z =- 10; z <= 10; z++) {                  xcor[z] = makeTextPlane(z, "green", size / 10);                  xcor[z].position = new BABYLON.Vector3(0, 0, z);               }            };            //Lets draw a mesh along the axis.            var spriteManagerPlayer = new BABYLON.SpriteManager("playerManager", "images/bird.png", 1, 200, scene);            var player = new BABYLON.Sprite("player", spriteManagerPlayer);            player.position.x = 2;            player.position.y = 2;            player.position.z = 0;            var zChardot = makeTextPlane(".", "red", 1);            zChardot.position = new BABYLON.Vector3(1.8, 1.8,0);            var box = BABYLON.Mesh.CreateBox("box", '2', scene);            box.position = new BABYLON.Vector3(-5,3,0); // center point of box x-axis is -5 and y axis is 3.            var box = BABYLON.Mesh.CreateBox("box", '2', scene);            box.position = new BABYLON.Vector3(0,3,-3); // center point of box x-axis is -5 and y axis is 3.            var redSphere = BABYLON.Mesh.CreateSphere("red", 32, 1, scene); //no position for sphere so by default it takes 0,0,0            showAxis(10);            returnscene;         };         var scene = createScene();         engine.runRenderLoop(function() {            scene.render();         });         

输出

上面的代码行生成以下输出 :

在这个演示中，我们使用了image bird.png.图像存储在本地的图像/文件夹中，也粘贴在下面以供参考.您可以下载您选择的任何图像并在演示链接中使用.

Images/bird.png

演示

                                                      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);            // camera            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(5, 3, 0), scene);            camera.setPosition(new BABYLON.Vector3(5, 10, -10));            camera.attachControl(canvas, true);                        // lights            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);            light.intensity = 0.8;                        var spot = new BABYLON.SpotLight(               "spot",                new BABYLON.Vector3(25, 15, -10),                new BABYLON.Vector3(-1, -0.8, 1), 15, 1, scene);            spot.diffuse = new BABYLON.Color3(1, 1, 1);            spot.specular = new BABYLON.Color3(0, 0, 0);            spot.intensity = 0.2;                         // material            var mat = new BABYLON.StandardMaterial("mat1", scene);            mat.alpha = 1.0;            mat.diffuseColor = new BABYLON.Color3(0.5, 0.5, 1.0);            mat.backFaceCulling = false;                        //mat.wireframe = true;            var makeTextPlane = function(text, color, size) {               var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);               dynamicTexture.hasAlpha = true;               dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);               var plane = new BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);               plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);               plane.material.backFaceCulling = false;               plane.material.specularColor = new BABYLON.Color3(0, 0, 0);               plane.material.diffuseTexture = dynamicTexture;               return plane;            };                        // show axis            var showAxis = function(size) {               var axisX = BABYLON.Mesh.CreateLines("axisX", [                   new BABYLON.Vector3(-size * 0.95, 0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                   new BABYLON.Vector3(-size * 0.95, -0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                  new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, 0.05 * size, 0),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)], scene);               axisX.color = new BABYLON.Color3(1, 0, 0);               var xChar = makeTextPlane("X", "red", size / 10);               xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);               var xChar1 = makeTextPlane("-X", "red", size / 10);               xChar1.position = new BABYLON.Vector3(-0.9 * size, 0.05 * size, 0);               var xcor = [];               for (i =- 10; i <= 10; i++) {                  xcor[i] = makeTextPlane(i, "red", size / 10);                  xcor[i].position = new BABYLON.Vector3(i, 0, 0);               }               var axisY = BABYLON.Mesh.CreateLines("axisY", [                  new BABYLON.Vector3( -0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                  new BABYLON.Vector3(0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( -0.05 * size, size * 0.95, 0),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)               ], scene);                              axisY.color = new BABYLON.Color3(0, 1, 0);               var yChar = makeTextPlane("Y", "green", size / 10);               yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);               var yChar1 = makeTextPlane("-Y", "green", size / 10);               yChar1.position = new BABYLON.Vector3(0, -0.9 * size, 0.05 * size);               var ycor = [];               for (y =- 10; y <= 10; y++) {                  xcor[y] = makeTextPlane(y, "green", size / 10);                  xcor[y].position = new BABYLON.Vector3(0, y, 0);               }               var axisZ = BABYLON.Mesh.CreateLines("axisZ", [                  new BABYLON.Vector3( 0 , -0.05 * size, -size * 0.95),                   new BABYLON.Vector3(0, 0, -size),                  new BABYLON.Vector3( 0 , 0.05 * size, -size * 0.95),                  new BABYLON.Vector3(0, 0, -size),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95),                  new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)               ], scene);               axisZ.color = new BABYLON.Color3(0, 0, 1);               var zChar = makeTextPlane("Z", "blue", size / 10);               zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);               var zChar1 = makeTextPlane("-Z", "blue", size / 10);               zChar1.position = new BABYLON.Vector3(0, 0.05 * size, -0.9 * size);               var zcor = [];               for (z =- 10; z <= 10; z++) {                  xcor[z] = makeTextPlane(z, "green", size / 10);                  xcor[z].position = new BABYLON.Vector3(0, 0, z);               }            };            var kite = BABYLON.Mesh.CreateLines("kite", [               new BABYLON.Vector3(-4,0,0),               new BABYLON.Vector3(0,4,0),                new BABYLON.Vector3(4,0,0),                new BABYLON.Vector3(0,-4,0),               new BABYLON.Vector3(-4,0,0)            ], scene);            kite.color = new BABYLON.Color3(1, 1, 1);            var path = [];            path.push(new BABYLON.Vector3(-4, 0, 0));            path.push(new BABYLON.Vector3(0, 0, 0));            path.push(new BABYLON.Vector3(4, 0, 0));            var lines1 = BABYLON.Mesh.CreateLines("lines",path, scene, true);            lines1.color = new BABYLON.Color3(1, 1, 1);            showAxis(10);            return scene;         };         var scene = createScene();         engine.runRenderLoop(function() {            scene.render();         });         

输出

以上代码行将生成以下输出:

矢量旋转

现在让我们看看矢量如何旋转工作.

演示

                                                      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);            // camera            var camera = new BABYLON.ArcRotateCamera("camera1",  0, 0, 0, new BABYLON.Vector3(5, 3, 0), scene);            camera.setPosition(new BABYLON.Vector3(0, 0, 0));            camera.attachControl(canvas, true);                        // lights            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(1, 0.5, 0), scene);            light.intensity = 0.8;            var spot = new BABYLON.SpotLight(               "spot",                new BABYLON.Vector3(25, 15, -10),                new BABYLON.Vector3(-1, -0.8, 1), 15, 1, scene);            spot.diffuse = new BABYLON.Color3(1, 1, 1);            spot.specular = new BABYLON.Color3(0, 0, 0);            spot.intensity = 0.2;                         // material            var mat = new BABYLON.StandardMaterial("mat1", scene);            mat.alpha = 1.0;            mat.diffuseColor = new BABYLON.Color3(0.5, 0.5, 1.0);            mat.backFaceCulling = false;                        //mat.wireframe = true;            var makeTextPlane = function(text, color, size) {               var dynamicTexture = new BABYLON.DynamicTexture("DynamicTexture", 50, scene, true);               dynamicTexture.hasAlpha = true;               dynamicTexture.drawText(text, 5, 40, "bold 36px Arial", color , "transparent", true);               var plane = new BABYLON.Mesh.CreatePlane("TextPlane", size, scene, true);               plane.material = new BABYLON.StandardMaterial("TextPlaneMaterial", scene);               plane.material.backFaceCulling = false;               plane.material.specularColor = new BABYLON.Color3(0, 0, 0);               plane.material.diffuseTexture = dynamicTexture;               return plane;            };            // show axis            var showAxis = function(size) {               var axisX = BABYLON.Mesh.CreateLines("axisX", [                   new BABYLON.Vector3(-size * 0.95, 0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                   new BABYLON.Vector3(-size * 0.95, -0.05 * size, 0),                  new BABYLON.Vector3(-size, 0, 0),                  new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, 0.05 * size, 0),                   new BABYLON.Vector3(size, 0, 0),                   new BABYLON.Vector3(size * 0.95, -0.05 * size, 0)               ], scene);                              axisX.color = new BABYLON.Color3(1, 0, 0);               var xChar = makeTextPlane("X", "red", size / 10);               xChar.position = new BABYLON.Vector3(0.9 * size, -0.05 * size, 0);               var xChar1 = makeTextPlane("-X", "red", size / 10);               xChar1.position = new BABYLON.Vector3(-0.9 * size, 0.05 * size, 0);               var xcor = [];               for (i =- 10; i <= 10; i++) {                  xcor[i] = makeTextPlane(i, "red", size / 10);                  xcor[i].position = new BABYLON.Vector3(i, 0, 0);               }               var axisY = BABYLON.Mesh.CreateLines("axisY", [                  new BABYLON.Vector3( -0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                  new BABYLON.Vector3(0.05 * size, -size * 0.95, 0),                  new BABYLON.Vector3(0, -size, 0),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( -0.05 * size, size * 0.95, 0),                   new BABYLON.Vector3(0, size, 0),                   new BABYLON.Vector3( 0.05 * size, size * 0.95, 0)               ], scene);                              axisY.color = new BABYLON.Color3(0, 1, 0);               var yChar = makeTextPlane("Y", "green", size / 10);               yChar.position = new BABYLON.Vector3(0, 0.9 * size, -0.05 * size);               var yChar1 = makeTextPlane("-Y", "green", size / 10);               yChar1.position = new BABYLON.Vector3(0, -0.9 * size, 0.05 * size);               var ycor = [];               for (y =- 10; y <= 10; y++) {                  xcor[y] = makeTextPlane(y, "green", size / 10);                  xcor[y].position = new BABYLON.Vector3(0, y, 0);               }               var axisZ = BABYLON.Mesh.CreateLines("axisZ", [                  new BABYLON.Vector3( 0 , -0.05 * size, -size * 0.95),                   new BABYLON.Vector3(0, 0, -size),                  new BABYLON.Vector3( 0 , 0.05 * size, -size * 0.95),                  new BABYLON.Vector3(0, 0, -size),                   new BABYLON.Vector3.Zero(),                   new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0 , -0.05 * size, size * 0.95),                  new BABYLON.Vector3(0, 0, size),                   new BABYLON.Vector3( 0, 0.05 * size, size * 0.95)               ], scene);                              axisZ.color = new BABYLON.Color3(0, 0, 1);               var zChar = makeTextPlane("Z", "blue", size / 10);               zChar.position = new BABYLON.Vector3(0, 0.05 * size, 0.9 * size);               var zChar1 = makeTextPlane("-Z", "blue", size / 10);               zChar1.position = new BABYLON.Vector3(0, 0.05 * size, -0.9 * size);               var zcor = [];               for (z =- 10; z <= 10; z++) {                  xcor[z] = makeTextPlane(z, "green", size / 10);                  xcor[z].position = new BABYLON.Vector3(0, 0, z);               }            };            var yellowSphere = BABYLON.Mesh.CreateSphere("yellowSphere",32, 1, scene);            yellowSphere.setPivotMatrix(BABYLON.Matrix.Translation(2, 0, 0));            var yellowMaterial = new BABYLON.StandardMaterial("yellowMaterial", scene);            yellowMaterial.diffuseColor = BABYLON.Color3.Yellow();            yellowSphere.material = yellowMaterial;            var wheel1 = BABYLON.MeshBuilder.CreateTorus('t1', {diameter: 2.0}, scene);            wheel1.position.x = -2.0            wheel1.position.z = -2.0;            showAxis(10);            var k = 0.0;            var y = 0.0;            var x = 0.0;            scene.registerBeforeRender(function () {               wheel1.rotation.copyFromFloats(0.0, 0.0, Math.PI / 2);               wheel1.addRotation(0.0, y, 0.0);                wheel1.addRotation(x, 0.0, 0.0);               yellowSphere.rotation.y += 0.01;               y += 0.05;             });            return scene;         };         var scene = createScene();         engine.runRenderLoop(function() {            scene.render();         });         

输出

上面的代码行生成以下输出 :