examples/canvas_transparent.html

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<div id="infoLight">
    <a href="http://scenejs.org">SceneJS</a> - scene with transparent canvas<br><br>
    This technique, in which we layer a transparent canvas over a div containing an image, is faster<br>
    than creating the background in the 3D scene because it avoids having to render fragments<br>
    via the GPU for the background, ie. avoids all those background pixels going down the GPU pipeline.<br><br>
    Note that since we didn't specify a canvas ID for the scene, the scene creates one automatically.<br>
</div>

<script>

    // Demonstrates how to have a transparent canvas

    // This example happens to have SceneJS automatically create the canvas, rather than
    // linking to a specified canvas that's already in the document. Transparency will work
    // exactly the same when linking your scene to a canvas that's already in the document.

    // Point SceneJS to the bundled plugins
    SceneJS.setConfigs({
        pluginPath: "../api/latest/plugins"
    });

    // Create scene
    var scene = SceneJS.createScene({

        // Make canvas transparent
        transparent: true,

        nodes: [

            // Mouse-orbited camera, defined by
            // plugin in http://scenejs.org/api/latest/plugins/node/cameras/orbit.js
            {
                type: "cameras/orbit",
                yaw: 30,
                pitch: -30,
                zoom: 10,
                zoomSensitivity: 10.0,
                spin: 0.1, // Slowly spin

                nodes: [
                    {
                        type: "material",
                        color: { r: 0.5, g: 0.5, b: 0.6 },
                        nodes: [

                            // Teapot primitive, implemented by plugin at
                            // http://scenejs.org/api/latest/plugins/node/geometry/teapot.js
                            {
                                type: "geometry/teapot"
                            }
                        ]
                    }
                ]
            }
        ]
    });

</script>
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