BabylonJS - Reflection Probes

Reflection probes are used to create a mirror like scene. This helps in seeing the reflection of the meshes in it. To create a mirror like scene, you need to call the class and the required meshes wherein you want to see reflection. Later, you need to add the meshes to the renderlist as shown below. Consider you have skybox with water surface and you need to show the clouds or tree reflection or the bird flying in the water, you can do so using reflection probe and the meshes created can be added to the renderlist as shown below.

Syntax

var probe = new BABYLON.ReflectionProbe("main", 512, scene);
probe.renderList.push(yellowSphere);
probe.renderList.push(greenSphere);	
probe.renderList.push(blueSphere);	
probe.renderList.push(mirror);

Demo

<!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 camera = new BABYLON.ArcRotateCamera("camera1", 0, 0, 10, BABYLON.Vector3.Zero(), scene);

            camera.setPosition(new BABYLON.Vector3(0, 5, -10));
            camera.attachControl(canvas, true);

            camera.upperBetaLimit = Math.PI / 2;
            camera.lowerRadiusLimit = 4;

            var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene);
            light.intensity = 0.7;

            var knot = BABYLON.Mesh.CreateTorusKnot("knot", 1, 0.4, 128, 64, 2, 3, scene);

            var yellowSphere = BABYLON.Mesh.CreateSphere("yellowSphere", 16, 1.5, scene);
            yellowSphere.setPivotMatrix(BABYLON.Matrix.Translation(3, 0, 0));

            var blueSphere = BABYLON.Mesh.CreateSphere("blueSphere", 16, 1.5, scene);
            blueSphere.setPivotMatrix(BABYLON.Matrix.Translation(-1, 3, 0));

            var greenSphere = BABYLON.Mesh.CreateSphere("greenSphere", 16, 1.5, scene);
            greenSphere.setPivotMatrix(BABYLON.Matrix.Translation(0, 0, 3));

            // Mirror
            var mirror = BABYLON.Mesh.CreateBox("Mirror", 1.0, scene);
            mirror.scaling = new BABYLON.Vector3(100.0, 0.01, 100.0);
            mirror.material = new BABYLON.StandardMaterial("mirror", scene);
            mirror.material.diffuseTexture = new BABYLON.Texture("images/square.jpg", scene);
            
            mirror.material.diffuseTexture.uScale = 10;
            mirror.material.diffuseTexture.vScale = 10;
            mirror.material.reflectionTexture = new BABYLON.MirrorTexture("mirror", 1024, scene, true);
            
            mirror.material.reflectionTexture.mirrorPlane = new BABYLON.Plane(0, -1.0, 0, -2.0);
            mirror.material.reflectionTexture.renderList = [greenSphere, yellowSphere, blueSphere, knot];
            mirror.material.reflectionTexture.level = 0.5;
            mirror.position = new BABYLON.Vector3(0, -2, 0);	

            // Main material	
            var mainMaterial = new BABYLON.StandardMaterial("main", scene);
            knot.material = mainMaterial;

            var probe = new BABYLON.ReflectionProbe("main", 512, scene);
            probe.renderList.push(yellowSphere);
            probe.renderList.push(greenSphere);	
            probe.renderList.push(blueSphere);	
            probe.renderList.push(mirror);	
            
            mainMaterial.diffuseColor = new BABYLON.Color3(1, 0.5, 0.5);	
            mainMaterial.reflectionTexture = probe.cubeTexture;
            mainMaterial.reflectionFresnel<h3>Parameters</h3> = new BABYLON.Fresnel<h3>Parameters</h3>();
            mainMaterial.reflectionFresnel<h3>Parameters</h3>.bias = 0.02;

            // Fog
            scene.fogMode = BABYLON.Scene.FOGMODE_LINEAR;
            scene.fogColor = scene.clearColor;
            scene.fogStart = 20.0;
            scene.fogEnd = 50.0;

            // Animations
            scene.registerBeforeRender(function () {
               yellowSphere.rotation.y += 0.01;
               greenSphere.rotation.y += 0.01;
               blueSphere.rotation.y += 0.01;
            });
            return scene;
         };
         var scene = createScene();
         engine.runRenderLoop(function() {
            scene.render();
         });
      </script>
   </body>
</html>

Output

In this demo, we have used image square.jpg. The images are stored in the images/ folder locally and are also pasted below for reference. You can download any image of your choice and use in the demo link.