Thanks Vladimir,
I'll try to write on offscreen in the next stable version of Java3D. I need multiple
universes with high performance and the 1.2 Beta1 crashses .
Vladimir Olenin wrote:
> If all u do is tracking pointer coordinates and painting smth in the
> current position, then u need to use double buffering to avoid flickering.
> Only in Java3D 1.2 u can draw into the offscreen image. In earlier
> versions u can't access the offscreen image. (The alternative is to
> create your own offscreen image and draw both 3D scene and your
> customized graphics into it, outputting it afterwards onto the
> physical device, but this would drastically drop the performance).
>
> Just in case u r not acquainted with double-buffering, below is a
> brief summary of this technique.
>
> 1) offscreenImg = comp.createImage(width, height);
> 2) offscreenGraphics = offscreenImg.getGraphics();
> 3) override comp.update(Graphics g) method:
> {
> paint(g); // Default implementation fills the area with
> // Background color first
> }
> 4) overide comp.paint(Graphics g) method:
> {
> // Output to offscreen image
> offscreenGraphics.????? // Draw whatever u want. In your case -
> // drawImage
>
> // Output to 'physical' device
> g.drawImage(...// offscreenImg ...);
> }
> -----------------------
>
> Basically that's all. In Java3D 1.2 version u already have offscreen
> image created, so, just do all your custom output to it (not
> necessarily in paint method, but u may also do it directly in MouseEvents handler,
>for
> instance). This way u wouldn't have to override canvas3D.paint method.
>
> Think this should help,
>
> vladimir
>
> PS: i never tried to do it myself in Java3D 1.2, but in theory this should
> work just fine. Also, i guess u shouldn't override update method in
> Java3D, because it must have been already overridden in Canvas3D
> class. Just do your output to the offscreenImage, that's all.
> -=V=-
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>
> In your previous letter u wrote:
> --------------------------------
> DdR> Hi everybody,
>
> DdR> I'm trying to create a custom cursor in a Java 3D application. When the
> DdR> renderer is updating the scene the cusor do flicker.
> DdR> Somebody can give me a hint ?
>
> DdR> Thanks in advance.
> DdR> Daniel del Rio.
>
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