This scene is working finel on Windows and Linux but there are lighting issue when we set the receiveShadows flags to true on an object. In this demo the ground's bottom must be highlited but it's not on Windows Phone 8.1 and Mac OS X.

SceneBabylon.js

'use strict';

window.onload = function () {
	var canvas = document.getElementById("renderCanvas");
	var engine = new BABYLON.Engine(canvas, true);
	var scene = new BABYLON.Scene(engine);
	
	// CAMERA
	var camera = new BABYLON.ArcRotateCamera("ArcRotateCamera", 1, 0.8, 10, new BABYLON.Vector3(15, 1, 15), scene);
	camera.minZ = 0.1;
	camera.maxZ = 5000000;
	scene.activeCamera.attachControl(canvas);
	
	// LIGHTS
	var light = new BABYLON.DirectionalLight("dir01", new BABYLON.Vector3(-1, -2, -1), scene);
	light.position = new BABYLON.Vector3(20, 40, 20);
	light.diffuse = new BABYLON.Color3(1, 1, 1);
	light.specular = new BABYLON.Color3(0.6, 0.6, 0.6);
	light.intensity = 0.6;
	
	var dirLight2 = new BABYLON.DirectionalLight("Dir1", new BABYLON.Vector3(0, 1, 0), scene);
	dirLight2.specular = new BABYLON.Color3(0.5, 0.5, 0.5);
	dirLight2.diffuse = new BABYLON.Color3(1.,1., 1.);
	dirLight2.intensity = 0.5;
	dirLight2.position = new BABYLON.Vector3(0,10,0);
	
	var hemiLight = new BABYLON.HemisphericLight("Hemi0", new BABYLON.Vector3(0, 1, 0), scene);
	hemiLight.diffuse = new BABYLON.Color3(0.8, 0.8, 0.8);
	hemiLight.specular = new BABYLON.Color3(0.1, 0.1, 0.1);
	hemiLight.groundColor = new BABYLON.Color3(1, 0, 0);
	hemiLight.intensity = 1.;
	
	var pointLight = new BABYLON.PointLight("Point0", new BABYLON.Vector3(0, 0, 0), scene);
	pointLight.diffuse = new BABYLON.Color3(0.6, 0.6, 0.6);
	pointLight.specular = new BABYLON.Color3(0.5, 0.5, 0.5 );
	pointLight.intensity = 0.3;
	
	// SHADOWS
	var shadowGenerator = new BABYLON.ShadowGenerator(1024, light);
	shadowGenerator.useVarianceShadowMap = false;
	
	// OBJECTS
	var ground = BABYLON.Mesh.CreateBox("box", 5, scene);
	ground.position = new BABYLON.Vector3(10, 0, 10);
	ground.material = new BABYLON.StandardMaterial("mat", scene);
	ground.material.ambientColor = new BABYLON.Color3(0, 0, 0);
	ground.material.diffuseColor = new BABYLON.Color3(1, 1, 1);
	ground.material.specularColor = new BABYLON.Color3(0.01, 0.01, 0.01);
	ground.scaling = new BABYLON.Vector3(10, 0.1, 10);
	ground.material.diffuseTexture = new BABYLON.Texture("images/ground.png", scene);
	ground.receiveShadows = true;
	
	var boxMaterial = new BABYLON.StandardMaterial("mat2", scene);
	boxMaterial.diffuseTexture = new BABYLON.Texture("images/box.png", scene);
	var box = null;
	
	for (var i = 0; i < 15; i++) {
		box = BABYLON.Mesh.CreateBox("box" + i, 1, scene);
		box.position = new BABYLON.Vector3(Math.random() * 25, 0.75, Math.random() * 25);
		box.material = boxMaterial;
		shadowGenerator.getShadowMap().renderList.push(box);
	}
	
	// MAIN
	engine.runRenderLoop(function() {
		scene.render();
	});
};