在我看来，当 Frame/JPanel/Canvas3D 已调整大小时，Java3D 有时会出现重绘场景的问题。我在使用 Java3D/JUNG3D 的应用程序中遇到问题，如果 Frame/JPanel/Canvas3D 的水平尺寸达到一定尺寸，整个场景就会消失。我试图简单地解决问题，然后发现以下示例代码中出现了类似的问题：http ://www.java3d.org/samples.html （倒数第二个示例，“Text 3D Example”）我将粘贴在底部方便。
脚步：
- 安装 Java3D
- 使用 3 个 Java3D jar 构建此示例。
- 跑
- 将框架水平拉伸到 500 像素左右，然后一切都消失了。缩小它然后它又在那里。当事物消失时，垂直伸展，事物再次出现。
它似乎与 Frame/JPanel/Canvas3D 纵横比及其显示的内容有关。我猜我自己的问题略有不同，因为我正在显示不同纵横比的场景，而根本问题是相同的。谁能告诉我如何才能绕过这个错误/功能，以便在调整窗口大小时场景永远不会消失？
以下是我到目前为止没有成功的尝试：
- 捕获 JPanel 调整大小事件，然后强制 Canvas3D 重绘
- 玩双缓冲设置
- 许多其他事情我现在不记得了——刚从假期回来:)
代码 ：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
public class Titles {
public static void main(String[] args) {
Titles t = new Titles();
t.setUp();
}
public void setUp() {
JFrame jf = new JFrame("Welcome");
// kill the window on close
jf.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent winEvent) {
System.exit(0);
}
});
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 1, 2, 2));
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D canvas3D = new Canvas3D(config);
canvas3D.setSize(360, 160);
SimpleUniverse universe = new SimpleUniverse(canvas3D);
BranchGroup group = new BranchGroup();
addObjects(group);
addLights(group);
universe.getViewingPlatform().setNominalViewingTransform();
universe.addBranchGraph(group);
panel.add(canvas3D);
jf.getContentPane().add(panel, BorderLayout.CENTER);
jf.pack();
jf.setVisible(true);
}
public void addLights(BranchGroup group) {
BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
1000.0);
Color3f light1Color = new Color3f(1.0f, 1.0f, 1.0f);
Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f);
DirectionalLight light1 = new DirectionalLight(light1Color,
light1Direction);
light1.setInfluencingBounds(bounds);
group.addChild(light1);
// Set up the ambient light
Color3f ambientColor = new Color3f(.1f, .1f, .1f);
AmbientLight ambientLightNode = new AmbientLight(ambientColor);
ambientLightNode.setInfluencingBounds(bounds);
group.addChild(ambientLightNode);
}
private void addObjects(BranchGroup group) {
Font3D f3d = new Font3D(new Font("TestFont", Font.PLAIN, 2),
new FontExtrusion());
Text3D text = new Text3D(f3d, new String("Java3D.org"), new Point3f(-3.5f,
-.5f, -4.5f));
text.setString("Java3D.org");
Color3f white = new Color3f(1.0f, 1.0f, 1.0f);
Color3f blue = new Color3f(.2f, 0.2f, 0.6f);
Appearance a = new Appearance();
Material m = new Material(blue, blue, blue, white, 80.0f);
m.setLightingEnable(true);
a.setMaterial(m);
Shape3D sh = new Shape3D();
sh.setGeometry(text);
sh.setAppearance(a);
TransformGroup tg = new TransformGroup();
Transform3D t3d = new Transform3D();
Transform3D tDown = new Transform3D();
Transform3D rot = new Transform3D();
Vector3f v3f = new Vector3f(-1.6f, -1.35f, -6.5f);
t3d.setTranslation(v3f);
rot.rotX(Math.PI / 5);
t3d.mul(rot);
v3f = new Vector3f(0, -1.4f, 0f);
tDown.setTranslation(v3f);
t3d.mul(tDown);
tg.setTransform(t3d);
tg.addChild(sh);
group.addChild(tg);
}
}