Re: [JAVA3D] Static scene vs. Camera navigated scene

Ian Wang Mon, 19 Nov 2001 12:59:14 -0800

It works finally. The problem is that my caption was out of range (outside of view). By adjusting its location and scale, I can see a stable stationary caption. So other items belonging to my background can be easily added. Thanks friends for your helps.

Ian Wang

----- Original Message -----

From: Ian Wang

To: [EMAIL PROTECTED]

Sent: Monday, November 19, 2001 1:34 PM

Subject: Re: [JAVA3D] Static scene vs. Camera navigated scene

Thanks Joachim, Xiaowen, and Thomas for your kind helps.

Joachim suggested to use Billboard, I believe it works. However, the text label (caption) will not be a completely fixed caption. It appears rotating back and forth a bit (not so stationary).

Thomas' method should work. I compiled your code, and it runs well. In my case, I didn't use keyNavigator. So I tried Xiaowen's suggestion first.

Xiaowen suggested to use ViewingPlatform.setPlatformGeometry() method to attach the caption to the ViewingPlatform of a SimpleUniverse. I did it as follows. No error message. But I cannot see my caption. How can I bring it in front of my eyes? Should I attach a BranchGroup node or a TransformGroup node?

    .....

    SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
    PlatformGeometry pg = new PlatformGeometry();
    pg.addChild(setCaption());
    ViewingPlatform vp = simpleU.getViewingPlatform();
    vp.setPlatformGeometry(pg);
    BranchGroup scene = createSceneGraph();

    simpleU.addBranchGraph(scene);

    .....



    public BranchGroup setCaption()
    {
        BranchGroup captionBG = new BranchGroup();
        TransformGroup captionTG = new TransformGroup();
        String fontName = "TestFont";
        String textString ="This is my Caption";
        float len = textString.length();

        Color3f textColor = new Color3f(0.7f, 0.8f, 0.6f);
        Material text = new Material(textColor,CONSTANTS.black,textColor,
                  CONSTANTS.white,100.0f);
        text.setLightingEnable(true);

        Appearance appearText = new Appearance();
        appearText.setMaterial(text);

        Line2D.Float height = new Line2D.Float(0.0f, 0.0f, 1.2f, 0.0f);
        Font3D f3d = new Font3D(new Font(fontName,Font.PLAIN,2),
                  new FontExtrusion(height));
        Text3D txt = new Text3D(f3d,textString,
                  new Point3f(-(len-1)/2,8.5f,0.0f),Text3D.ALIGN_FIRST, Text3D.PATH_RIGHT);

        Shape3D textShape = new Shape3D();
        textShape.setGeometry(txt);
        textShape.setAppearance(appearText);

        Transform3D tex = new Transform3D();
        tex.set(new Vector3f(50.0f, 50.0f, 222.0f)); <----- location of my caption
        captionTG.setTransform(tex);

        captionTG.addChild(textShape);
        captionBG.addChild(captionTG);
        return captionBG;
     }

I guess I didn't use the correct TransformGroup.

Ian Wang

>From: "Wang, Lihui" <[EMAIL PROTECTED]>
>Reply-To: Discussion list for Java 3D API <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: [JAVA3D] Static scene vs. Camera navigated scene
>Date: Fri, 16 Nov 2001 14:43:24 -0500
>
>Hello,
>
>I have a scene graph attached to a Simple Universe. By manipulating a
>camera's TransformGroup obtained through
>SimpleU.getViewingPlatform().getViewPlatformTransform(), It is possible to
>do a camera-based navigation through my Java 3D scene.
>
>Now, I want to add a stationary background with a static Text3D label to the
>same Canvas3D, but not to be affected by the camera's viewpoint. It means
>that no matter where the viewpoint is and no matter what the camera's
>orientation is, the background and the text label remain stationary to the
>viewer.
>
>Could somebody kindly give me a hint of how to do it? Is it possible to
>detach the ViewPlatform from the SimpleUniverse and attach it to a lower
>node, so the higher part of the scene graph may become stationary?
>
>Thanks.
>
>Ian Wang

Re: [JAVA3D] Static scene vs. Camera navigated scene

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