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diff --git a/sandbox/three_envmap_issue/envmap/readme.txt b/sandbox/three_envmap_issue/envmap/readme.txt
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+++ b/sandbox/three_envmap_issue/envmap/readme.txt
@@ -0,0 +1,13 @@
+Author
+======
+
+This is the work of Emil Persson, aka Humus.
+http://www.humus.name
+
+
+
+License
+=======
+
+This work is licensed under a Creative Commons Attribution 3.0 Unported License.
+http://creativecommons.org/licenses/by/3.0/
diff --git a/sandbox/three_envmap_issue/envmap_issue.html b/sandbox/three_envmap_issue/envmap_issue.html
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index 0000000..db21bc2
--- /dev/null
+++ b/sandbox/three_envmap_issue/envmap_issue.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+	<meta http-equiv="content-type" content="text/html;charset=utf-8">
+	<meta name="viewport" content="width=device-width, user-scalable=no">
+
+	<title>Example</title>
+
+	<style>
+		html, body
+		{
+			font-family: Arial, Helvetica, sans-serif;
+		}
+
+		iframe
+		{
+			border: 1px solid #cccccc;
+		}
+	</style>
+
+	<script type='text/javascript'>
+
+	</script>
+</head>
+
+<body>
+	<div>r130:</div>
+	<div>
+		<iframe width="400" height="300" src="three_viewer.html#https://cdn.jsdelivr.net/npm/three@0.130.0/build/three.min.js"></iframe>
+	</div>
+
+	<div>r131:</div>
+	<div>
+		<iframe width="400" height="300" src="three_viewer.html#https://cdn.jsdelivr.net/npm/three@0.132.0/build/three.min.js"></iframe>
+	</div>
+</body>
+
+</html>
diff --git a/sandbox/three_envmap_issue/three_viewer.html b/sandbox/three_envmap_issue/three_viewer.html
new file mode 100644
index 0000000..bc530a5
--- /dev/null
+++ b/sandbox/three_envmap_issue/three_viewer.html
@@ -0,0 +1,128 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+	<meta http-equiv="content-type" content="text/html;charset=utf-8">
+	<meta name="viewport" content="width=device-width, user-scalable=no">
+
+	<title>Example</title>
+
+	<style>
+		html, body
+		{
+			width: 100%;
+			height: 100%;
+			margin: 0px;
+			padding: 0px;
+		}
+
+		canvas
+		{
+			width: 100%;
+			height: 100%;
+		}
+	</style>
+
+	<script type='text/javascript'>
+		function Sandbox3D ()
+		{
+			let canvas = document.getElementById ('canvas');
+
+			let parameters = {
+				canvas : canvas,
+				antialias : true
+			};
+
+			let renderer = new THREE.WebGLRenderer (parameters);
+			renderer.setClearColor ('#ffffff', 1);
+
+			let width = document.body.clientWidth;
+			let height = document.body.clientHeight;
+			renderer.setSize (width, height);
+
+			let scene = new THREE.Scene ();
+
+			let camera = new THREE.PerspectiveCamera (45.0, width / height, 0.1, 1000.0);
+			camera.position.set (0.0, 6.0, 2.0);
+			camera.up.set (0.0, 0.0, 1.0);
+			camera.lookAt (new THREE.Vector3 (0.0, 0.0, 0.0));
+			scene.add (camera);
+
+			let ambientLight = new THREE.AmbientLight (0x888888);
+			scene.add (ambientLight);
+
+			let light = new THREE.DirectionalLight (0x888888);
+			light.position.copy (camera.position);
+			scene.add (light);
+
+			let rgb = [0, 197, 237];
+			let baseColor = new THREE.Color (rgb[0] / 255.0, rgb[1] / 255.0, rgb[2] / 255.0);
+
+			let phongGeometry = new THREE.SphereGeometry (1.0, 32, 16);
+			let phongMaterial = new THREE.MeshPhongMaterial ({
+				color : baseColor
+			});
+
+			let standardGeometry = new THREE.SphereGeometry (1.0, 32, 16);
+			let standardMaterial = new THREE.MeshStandardMaterial ({
+				color : baseColor,
+				metalness : 0.0,
+				roughness : 0.0
+			});
+
+			let emissiveRgb = [0, 0, 0];
+			let emissiveColor = new THREE.Color (emissiveRgb[0] / 255.0, emissiveRgb[1] / 255.0, emissiveRgb[2] / 255.0);
+			phongMaterial.emissive = emissiveColor;
+			standardMaterial.emissive = emissiveColor;
+
+			let phongMesh = new THREE.Mesh (phongGeometry, phongMaterial);
+			phongMesh.position.set (1.5, 0.0, 0.0);
+
+			let standardMesh = new THREE.Mesh (standardGeometry, standardMaterial);
+			standardMesh.position.set (-1.5, 0.0, 0.0);
+
+			scene.add (phongMesh);
+			scene.add (standardMesh);
+			renderer.render (scene, camera);
+
+			let envMaps = [
+				'envmap/posx.jpg',
+				'envmap/negx.jpg',
+				'envmap/posy.jpg',
+				'envmap/negy.jpg',
+				'envmap/posz.jpg',
+				'envmap/negz.jpg'
+			];
+
+			let loader = new THREE.CubeTextureLoader ();
+			scene.environment = loader.load (envMaps, () => {
+				renderer.render (scene, camera);
+			});
+
+			window.onresize = function () {
+				let width = document.body.clientWidth;
+				let height = document.body.clientHeight;
+				camera.aspect = width / height;
+		        camera.updateProjectionMatrix ();
+				renderer.setSize (width, height);
+				renderer.render (scene, camera);
+			};
+		}
+
+		window.onload = function () {
+			let scriptElement = document.createElement ('script');
+			scriptElement.type = 'text/javascript';
+			scriptElement.src = window.location.hash.substr (1);
+			scriptElement.onload = () => {
+				Sandbox3D ();
+			};
+			document.head.appendChild (scriptElement);
+		};
+	</script>
+</head>
+
+<body>
+	<canvas id="canvas"></canvas>
+</body>
+
+</html>
