Off-screen rendering: My vote for that idea!
I'd prefer the direct-to-bufferedImage-rendering. In fact, I could need
such a feature right now.
Christian
Eric Hawthorne wrote:
> I have a feature request for the next Java3D version.
>
> Off-screen rendering.
>
> Right now, if you want to make an application where
> Java3D runs on a server and captured frames are shown on a client,
> the only way to do it seems to be to call
> GraphicsContext3D.readRaster(..)
> which can read the currently rendered frame into a Raster object from
> which
> you can extract an Image object. Unfortunately, what readRaster(..)
> captures
> is the pixels from the computer display screen in the rectangle of the
> Canvas3D.
> So if you have any windows popping up over the Java GUI, for any reason
> at
> all, you get pieces of those other window contents being served kindly
> to your
> graphics-viewing clients. For a whole host of reasons this is bad.
>
> Ideally, one wants a way to have Java3D be able to render directly into
> some kind of Java
> buffered image object, or at the very least to be able to image-capture
> only the true contents of the Canvas3D, and not overlayed windows.
>
> The driving issue is that present-day web-based apps targeted at the
> masses cannot
> assume Java3D or even a VRML player on the client.
> They can only assume at most a thin Java (1.1) applet, talking http to a
> server.
>
> So we need a way of allowing Java3D to be used effectively as a
> rendering server,
> for semi-interactive 3D graphics on the client.
>
> I imagine the problem preventing this has something to do with the use
> of
> graphics cards and native methods. What are the technical prospects for
> off-screen
> rendering or frame-capturing in Java3D?
>
> Eric
>
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