
        <script src="../gfx/gfx-scene.js" type="text/javascript"></script>
	</head>
	<body>
	<!-- shader scripts  -->
		<script id="fragment_shader" type="x-shader/x-fragment">
            #ifdef GL_ES
            precision highp float;
            #endif

            uniform sampler2D tOne;
            uniform sampler2D tSec;
            varying vec2 vUv;

            void main(void)
            {
                vec3 c;
                vec4 Ca = texture2D(tOne, vUv);
                vec