Hi All,
on the OSG list there is some discussion about embedding OSG ina web page, and
this just came through:
Message: 2
Date: Thu, 07 Apr 2011 15:27:54 -0400
From: Peter Amstutz <[email protected]>
To: OpenSceneGraph Users <[email protected]>
Subject: Re: [osg-users] OSG plugin for browsers
Message-ID: <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
On 4/7/2011 5:30 AM, Thibault Genessay wrote:
> > Other people have thought of alternatives to display 3D content:
> > - osgjs - which re-implements the OSG in Javascript. Although the API
> > is very close to the C++ one, it is not a way to embed an OSG app in a
> > browser
> > - webGL. If I am not mistaken, this leaves out the OSG entirely, and
> > only aims at displaying 3D models. Kind of a new VRML thing.
> >
Just to clarify, WebGL consists of Javascript bindings for OpenGL, which
are used by osgjs for rendering. So if you already have a C++ program,
you would need to port it to javascript in order to use such libraries.
Possibly you could emit opengl calls from the C++ server side and
execute them in the client with WebGL, but that would be pretty
bandwidth intensive and subject to lag.
Broadly speaking, if the goal is to execute native code using OSG in the
browser, you're going to run up against all the security, hardware
architecture etc problems that plague all such efforts.
My preference would be for a solution that transmits the scene graph to
the browser to be rendered using something like osgjs and the server
sends scene graph updates, but that is somewhat complex and difficult to
do transparently as osg lacks the necessary "value changed" hooks to
record the changes that occur in the scene graph from frame to frame.
... but OpenSG has them. :)
Just as a thought experiment, what would it take to have a web application that
could connect to an OpenSG program on a server and receive RemoteAspect syncs
through HTTP? Would that be something interesting to try?
I'm not advocating working on it just yet, but somehow the idea is intriguing...
What do you think?
Dirk
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