我为 MATLAB 编写了一个 JAVA-3D 扩展，以便能够以良好的性能进行 3D 绘图。我现在可以画线、点等。
但是如果你运行我的程序——即使在 main 中加载了几个对象——从某些查看位置一切都会消失。
如果任何熟悉 Java 3D 的人可以帮助我，我会非常高兴。从它工作的那一刻起，我计划在 Mathworkscentral 上发布它，包括感谢所有帮助解决问题的人。这是代码：
import com.sun.j3d.utils.behaviors.vp.*;
import java.awt.BorderLayout;
import java.awt.event.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.swing.JFrame;
import javax.vecmath.*;
public class scatterJ3D extends JFrame {
/**
*
*/
private static final long serialVersionUID = 8657880087849824536L;
public SimpleUniverse MyUniverse;
BoundingSphere bounds;
public scatterJ3D(int WindowWidth, int WindowHeight, String Title) {
// Make sure MATLAB is not closed when GUI is closed:
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
dispose();
}
});
// Launch and init GUI
setTitle(Title);
setSize(WindowWidth, WindowHeight);
setLocationRelativeTo(null);
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
Canvas3D c = new Canvas3D(config);
c.setSize(WindowWidth, WindowHeight);
c.setDoubleBufferEnable(true);
add("Center", c);
// Create MyUniverse
MyUniverse = new SimpleUniverse(c);
// Init Bounds
bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);
// Enable Mouse rotation - new Way
OrbitBehavior orbit = new OrbitBehavior(c, OrbitBehavior.REVERSE_ALL);
// Option vertikales Drehen verhindern:
// orbit.setRotYFactor(0.0f);
orbit.setSchedulingBounds(bounds);
// Create Viewing Platform
ViewingPlatform vp = MyUniverse.getViewingPlatform();
vp.setViewPlatformBehavior(orbit);
MyUniverse.getViewingPlatform().setNominalViewingTransform();
// Set near Plane clipping
View myview = c.getView();
myview.setFrontClipDistance(0.0f);
myview.setBackClipDistance(100.0f);
myview.setVisibilityPolicy(View.VISIBILITY_DRAW_ALL);
}
public void setView(String Mode) {
ViewingPlatform vp = MyUniverse.getViewingPlatform();
// Set the user's initial viewpoint using lookAt()
TransformGroup vpTG = vp.getViewPlatformTransform();
Transform3D t3d = new Transform3D();
vpTG.getTransform(t3d);
// lookAt Arguments are: viewer position, where looking, up direction
if (Mode.compareToIgnoreCase("Lab") == 0) {
System.out.println("View set to Lab Mode!");
t3d.lookAt(new Point3d(0.0f, 0.0f, -2.0f), new Point3d(0.0f, 0.0f,
0.0f), new Vector3d(1.0, 0.0, 0.0));
} else if (Mode.compareToIgnoreCase("RGB") == 0) {
System.out.println("View set to Lab Mode!");
t3d.lookAt(new Point3d(3.0f, -1.0f, -2.0f), new Point3d(0.0f, 0.0f,
0.0f), new Vector3d(1.0, 1.0, 1.0));
} else {
System.out
.println("ERROR --> View can only be set to RGB or Lab Mode!");
}
t3d.invert();
vpTG.setTransform(t3d);
}
public void setView(float viewerPosition[],float lookAt[], float upVector[]) {
// Convert MATLAB float to Java Data Types
Point3d JviewerPosition = new Point3d(viewerPosition[0], viewerPosition[1], viewerPosition[2]);
Point3d JlookAt = new Point3d(lookAt[0], lookAt[1], lookAt[2]);
Vector3d JupVector = new Vector3d(upVector[0], upVector[1], upVector[2]);
ViewingPlatform vp = MyUniverse.getViewingPlatform();
// Set the user's initial viewpoint using lookAt()
TransformGroup vpTG = vp.getViewPlatformTransform();
Transform3D t3d = new Transform3D();
vpTG.getTransform(t3d);
// Set LookAt to input Values
t3d.lookAt(JviewerPosition, JlookAt, JupVector);
t3d.invert();
vpTG.setTransform(t3d);
}
public Background setBackgroundColor(float r, float g, float b) {
// Create BranchGroup MyRoot
BranchGroup MyRoot = new BranchGroup();
// Set the background color
Background back = new Background(r, g, b);
back.setApplicationBounds(bounds);
back.setCapability(Background.ALLOW_COLOR_WRITE);
// System.out.println("Hier komma noch hin");
MyRoot.addChild(back);
MyRoot.compile();
MyUniverse.addBranchGraph(MyRoot);
return back;
}
// public Shape3D createPoints(float Coords[][], float Colors[][],int pointsize, float pivot[])
public PointArray createPoints(float Coords[][], float Colors[][],
int pointsize, float pivot[])
{
// Convert MATLAB float to Java Data Types
Vector3f Jpivot = new Vector3f(pivot[0], pivot[1], pivot[2]);
Point3f Jcoords[] = new Point3f[Coords.length];
Color4f Jcolors[] = new Color4f[Colors.length];
for (int i = 0; i < Coords.length; i++) {
Jcoords[i] = new Point3f(Coords[i][0], Coords[i][1], Coords[i][2]);
// x-Achse zeigt nach oben, y-Achse nach rechts:
Jcolors[i] = new Color4f(Colors[i][0], Colors[i][1], Colors[i][2],
Colors[i][3]);
}
// set up the appearance to make large, transparent, antialiased points
Appearance app = new Appearance();
// increase the size of each point and turn on AA
// PointAttributes pa = new PointAttributes(3.0f, true);
// app.setPointAttributes(pa);
// set up transparency
TransparencyAttributes ta = new TransparencyAttributes();
ta.setTransparencyMode(TransparencyAttributes.NICEST);
ta.setTransparency(0.5f); // used if color is not COLOR_4
app.setTransparencyAttributes(ta);
PointArray pointCloud = new PointArray(Jcoords.length,
PointArray.COORDINATES | PointArray.COLOR_4);
pointCloud.setCoordinates(0, Jcoords);
pointCloud.setColors(0, Jcolors);
pointCloud.setCapability(PointArray.ALLOW_COORDINATE_WRITE);
// Point size 10
PointAttributes pa = new PointAttributes(pointsize, true);
app.setPointAttributes(pa);
// Make Shape
Shape3D pointCloudShape = new Shape3D(pointCloud, app);
// Create BranchGroup MyRoot
BranchGroup MyRoot = new BranchGroup();
Transform3D zTrans = new Transform3D();
// zTrans.set(new Vector3f(0.0f, 0.0f, -1.0f));
Jpivot.negate();
zTrans.set(Jpivot);
TransformGroup objTrans = new TransformGroup(zTrans);
objTrans.addChild(pointCloudShape);
MyRoot.addChild(objTrans);
// Content-Branch optimieren und zurueckgeben
MyRoot.compile();
MyUniverse.addBranchGraph(MyRoot);
//return pointCloudShape;
return pointCloud;
}
//public Shape3D movePoints(Shape3D pointCloudShape, float Coords[][]) {
public PointArray movePoints(PointArray pointCloud, float Coords[][]) {
// Convert MATLAB float to Java Data Types
Point3f Jcoords[] = new Point3f[Coords.length];
for (int i = 0; i < Coords.length; i++) {
Jcoords[i] = new Point3f(Coords[i][0], Coords[i][1], Coords[i][2]);
}
// return pointCloudShape;
return pointCloud;
}
public Shape3D createLines(float fromCoords[][], float toCoords[][],
float Colors[][], float linesize, float pivot[]) {
// Convert MATLAB float to Java Data Types
Vector3f Jpivot = new Vector3f(pivot[0], pivot[1], pivot[2]);
Point3f JCoords[] = new Point3f[toCoords.length * 2];
Color4f JColors[] = new Color4f[Colors.length * 2];
for (int i = 0; i < fromCoords.length; i++) {
JCoords[i * 2] = new Point3f(fromCoords[i][0], fromCoords[i][1],
fromCoords[i][2]);
JCoords[i * 2 + 1] = new Point3f(toCoords[i][0], toCoords[i][1],
toCoords[i][2]);
// x-Achse zeigt nach oben, y-Achse nach rechts:
JColors[i * 2] = new Color4f(Colors[i][0], Colors[i][1],
Colors[i][2], Colors[i][3]);
JColors[i * 2 + 1] = new Color4f(Colors[i][0], Colors[i][1],
Colors[i][2], Colors[i][3]);
}
// Set Appearance
Appearance app = new Appearance();
// // Transparency
TransparencyAttributes ta = new TransparencyAttributes();
ta.setTransparencyMode(TransparencyAttributes.NICEST);
ta.setTransparency(1.0f); // used if color is not COLOR_4
app.setTransparencyAttributes(ta);
// // SetLinesize and Pattern (SOLID, DASH, DOT)
LineAttributes la = new LineAttributes(linesize,
LineAttributes.PATTERN_SOLID, true);
app.setLineAttributes(la);
// Create Line Array
LineArray dot = new LineArray(JCoords.length, LineArray.COORDINATES
| LineArray.COLOR_4);
// System.out.println(JCoords[0]);
dot.setCoordinates(0, JCoords, 0, JCoords.length);
dot.setColors(0, JColors, 0, JColors.length);
// Make Shape
Shape3D dotShape = new Shape3D(dot, app);
// Create BranchGroup MyRoot
BranchGroup MyRoot = new BranchGroup();
Transform3D zTrans = new Transform3D();
Jpivot.negate(); // move Object Pivot to Universe(0,0,0)
zTrans.set(Jpivot);
TransformGroup objTrans = new TransformGroup(zTrans);
objTrans.addChild(dotShape);
MyRoot.addChild(objTrans);
// Content-Branch optimieren und zurueckgeben
MyRoot.compile();
MyUniverse.addBranchGraph(MyRoot);
return dotShape;
}
public static void main(String[] args) {
// Init some Values
float colors[][] = new float[8][4];
float coords[][] = new float[8][3];
colors[0][0] = 0.0f; colors[0][1] = 0.0f; colors[0][2] = 0.0f; colors[0][3] = 1.0f;
colors[1][0] = 1.0f; colors[1][1] = 0.0f; colors[1][2] = 0.0f; colors[1][3] = 1.0f;
colors[2][0] = 0.0f; colors[2][1] = 1.0f; colors[2][2] = 0.0f; colors[2][3] = 1.0f;
colors[3][0] = 0.0f; colors[3][1] = 0.0f; colors[3][2] = 1.0f; colors[3][3] = 1.0f;
colors[4][0] = 1.0f; colors[4][1] = 1.0f; colors[4][2] = 0.0f; colors[4][3] = 1.0f;
colors[5][0] = 0.0f; colors[5][1] = 1.0f; colors[5][2] = 1.0f; colors[5][3] = 1.0f;
colors[6][0] = 1.0f; colors[6][1] = 0.0f; colors[6][2] = 1.0f; colors[6][3] = 1.0f;
colors[7][0] = 1.0f; colors[7][1] = 1.0f; colors[7][2] = 1.0f; colors[7][3] = 1.0f;
coords[0][0] = 0.0f; coords[0][1] = 0.0f; coords[0][2] = 0.0f;
coords[1][0] = 1.0f; coords[1][1] = 0.0f; coords[1][2] = 0.0f;
coords[2][0] = 0.0f; coords[2][1] = 1.0f; coords[2][2] = 0.0f;
coords[3][0] = 0.0f; coords[3][1] = 0.0f; coords[3][2] = 1.0f;
coords[4][0] = 1.0f; coords[4][1] = 1.0f; coords[4][2] = 0.0f;
coords[5][0] = 0.0f; coords[5][1] = 1.0f; coords[5][2] = 1.0f;
coords[6][0] = 1.0f; coords[6][1] = 0.0f; coords[6][2] = 1.0f;
coords[7][0] = 1.0f; coords[7][1] = 1.0f; coords[7][2] = 1.0f;
float pivot[] = new float[3];
pivot[0] = 0.5f; pivot[1] = 0.5f; pivot[2] = 0.5f;
// Create Window
scatterJ3D MyGFX = new scatterJ3D(800, 600, "Trallala");
MyGFX.setVisible(true);
// Load Points
PointArray MyPoints1 = MyGFX.createPoints(coords, colors, 15, pivot);
// Init Values for Lines
float lscoords[][] = new float[4][3];
lscoords[0][0] = 0.0f;lscoords[0][1] = 0.0f;lscoords[0][2] = 0.0f;
lscoords[1][0] = 0.0f;lscoords[1][1] = 0.0f;lscoords[1][2] = 0.0f;
lscoords[2][0] = 0.0f;lscoords[2][1] = 0.0f;lscoords[2][2] = 0.0f;
lscoords[3][0] = 0.0f;lscoords[3][1] = 0.0f;lscoords[3][2] = 0.0f;
float ldcoords[][] = new float[4][3];
ldcoords[0][0] = 1.5f;ldcoords[0][1] = 0.0f;ldcoords[0][2] = 0.0f;
ldcoords[1][0] = 0.0f;ldcoords[1][1] = 1.5f;ldcoords[1][2] = 0.0f;
ldcoords[2][0] = 0.0f;ldcoords[2][1] = 0.0f;ldcoords[2][2] = 1.5f;
ldcoords[3][0] = 1.0f;ldcoords[3][1] = 1.0f;ldcoords[3][2] = 1.0f;
float lcolors[][] = new float[4][4];
lcolors[0][0] = 1.0f;lcolors[0][1] = 0.0f;lcolors[0][2] = 0.0f;lcolors[0][3] = 1.0f;
lcolors[1][0] = 0.0f;lcolors[1][1] = 1.0f;lcolors[1][2] = 0.0f;lcolors[1][3] = 1.0f;
lcolors[2][0] = 0.2f;lcolors[2][1] = 0.2f;lcolors[2][2] = 1.0f;lcolors[2][3] = 1.0f;
lcolors[3][0] = 1.0f;lcolors[3][1] = 1.0f;lcolors[3][2] = 1.0f;lcolors[3][3] = 1.0f;
// Load Lines
MyGFX.createLines(lscoords, ldcoords, lcolors, 2, pivot);
// Set Background color
MyGFX.setBackgroundColor(0.5f, 0.5f, 0.5f);
MyGFX.setView("rgb");
}
}