It would be great if the shading language and webgl context can also run on top of Adobe's new Stage 3D rendering engine via javascript liveconnect. It would give widespread access to webgl.

How does new Stage3D WebGL graphics context work? any demos available?

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In order to emulate events on the original WebGL canvas, you may put a transparent DIV on top of flash player with a higher z-index and use that div to communicate events between flash player and javascript. In other words, when a developer wants to add a mouse down or mouse move events, adding event actions must be directed to this transparent DIV under the hood. The events will be passed to flash player as they fired on this DIV again under the hood.

Discussion thread started at http://groups.google.com/group/cwebgl/browse_thread/thread/7b25763ab591178a