Example usage for javax.media.j3d Group getBounds

Introduction

In this page you can find the example usage for javax.media.j3d Group getBounds.

Prototype

public Bounds getBounds() 

Source Link

Document

Returns the bounding object of a node.

Usage

From source file:ExDepthCue.java

public Group buildScene() {
    // Get the current color
    Color3f color = (Color3f) colors[currentColor].value;

    // Turn off the example headlight
    setHeadlightEnable(false);/*  ww  w . j  av a2  s. c o m*/

    // Create the scene group
    Group scene = new Group();

    // Create a switch group to hold the fog node. This enables
    // us to turn the fog node on and off via the GUI.
    fogSwitch = new Switch();
    fogSwitch.setCapability(Switch.ALLOW_SWITCH_WRITE);

    // Create influencing bounds
    Bounds worldBounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), // Center
            1000.0); // Extent

    // Set the fog color, density, and its influencing bounds
    fog = new LinearFog();
    fog.setColor(color);
    // front and back distances set below
    fog.setCapability(Fog.ALLOW_COLOR_WRITE);
    fog.setCapability(Fog.ALLOW_INFLUENCING_BOUNDS_WRITE);
    fog.setInfluencingBounds(worldBounds);
    fogSwitch.addChild(fog);
    scene.addChild(fogSwitch);
    if (depthCueOnOff)
        fogSwitch.setWhichChild(0); // on
    else
        fogSwitch.setWhichChild(Switch.CHILD_NONE); // off

    // Set the background color and its application bounds
    //   Usually, the background color should match the fog color
    //   or the results look odd.
    background = new Background();
    background.setColor(color);
    background.setApplicationBounds(worldBounds);
    background.setCapability(Background.ALLOW_COLOR_WRITE);
    scene.addChild(background);

    // Build foreground geometry
    Group content = buildIsoline();
    scene.addChild(content);

    // Automatically compute good front and back distances for
    // fog to get good depth-cueing. To do this, first get the
    // dimensions of the bounds around the content. Then,
    // set the front distance to be at the center of the content
    // (or closer by a tad) and the back distance at the front
    // distance PLUS half the depth of the content's bounding box
    BoundingSphere sampleSphere = new BoundingSphere();
    BoundingBox sampleBox = new BoundingBox();
    Bounds bounds = content.getBounds();
    double deltaDistance = 0.0;
    double centerZ = 0.0;

    if (bounds == null) {
        // No bounds available. Estimate the values knowing
        // that the above content is what it is.
        centerZ = 0.5; // 0.5 closer than true center
        deltaDistance = 2.0;
    } else if (bounds.getClass() == sampleSphere.getClass()) {
        BoundingSphere sphereBounds = (BoundingSphere) bounds;
        deltaDistance = Math.abs(sphereBounds.getRadius());
        Point3d center = new Point3d();
        sphereBounds.getCenter(center);
        centerZ = center.z + 0.5; // 0.5 closer than true center
    } else if (bounds.getClass() == sampleBox.getClass()) {
        BoundingBox boxBounds = (BoundingBox) bounds;
        Point3d p1 = new Point3d();
        Point3d p2 = new Point3d();
        boxBounds.getLower(p1);
        boxBounds.getUpper(p2);
        deltaDistance = p2.z - p1.z;
        if (deltaDistance < 0.0)
            deltaDistance *= -1.0;
        if (p1.z > p2.z)
            centerZ = p1.z - deltaDistance / 2.0;
        else
            centerZ = p2.z - deltaDistance / 2.0;
        centerZ += 0.5; // 0.5 closer than true center
    } else {
        System.err.println("Unknown bounds type");
    }

    // Set front distance to the distance from the default
    // viewing position (0,0,10) to the center of the bounds.
    fog.setFrontDistance(10.0f - (float) centerZ);

    // Set back distance to the distance from the default
    // viewing position (0,0,10) to the back of the bounds.
    fog.setBackDistance(10.0f - (float) centerZ + (float) deltaDistance);

    return scene;
}

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