我正在Java3D 中创建一个莫比乌斯带。我有一条缝，我似乎无法摆脱它！我假设它与法线有关，并且连接边缘之间的角度差异在技术上是 180 度。有人可以帮我去除这个接缝吗？
这是我的代码：
public class MobiusStrip extends Applet {
public static void main(String[] args){
new MainFrame(new MobiusStrip(), 800, 600);
}
@Override
public void init(){
GraphicsConfiguration gc = SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas = new Canvas3D(gc);
this.setLayout(new BorderLayout());
this.add(canvas, BorderLayout.CENTER);
SimpleUniverse su = new SimpleUniverse(canvas);
su.getViewingPlatform().setNominalViewingTransform();
BranchGroup bg = createSceneGraph();
bg.compile();
su.addBranchGraph(bg);
}
private BranchGroup createSceneGraph(){
BranchGroup root = new BranchGroup();
Shape3D shape = new Shape3D();
shape.setGeometry(mobius().getIndexedGeometryArray());
//Scaling transform
Transform3D tr = new Transform3D();
tr.setScale(0.5);
//Spin transform group
TransformGroup spin = new TransformGroup();
spin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
root.addChild(spin);
//Set appearance
Appearance ap = new Appearance();
PointAttributes pa = new PointAttributes(10, true);
ap.setPointAttributes(pa);
ap.setPolygonAttributes(new PolygonAttributes
(PolygonAttributes.POLYGON_FILL,
PolygonAttributes.CULL_NONE, 0));
//Set materials
Material mat = new Material();
mat.setLightingEnable(true);
mat.setShininess(30);
ap.setMaterial(mat);
//Overarching Transform group
TransformGroup tg = new TransformGroup(tr);
tg.addChild(shape);
spin.addChild(tg);
shape.setAppearance(ap);
//Set rotation
Alpha alpha = new Alpha(-1, 6000);
RotationInterpolator rotate = new RotationInterpolator(alpha, spin);
BoundingSphere bounds = new BoundingSphere();
rotate.setSchedulingBounds(bounds);
spin.addChild(rotate);
//Set background
Background background = new Background(1.0f, 1.0f, 1.0f);
background.setApplicationBounds(bounds);
root.addChild(background);
//Set lighting
AmbientLight light = new AmbientLight(true, new Color3f(Color.BLACK));
light.setInfluencingBounds(bounds);
root.addChild(light);
PointLight ptlight = new PointLight(new Color3f(Color.white),
new Point3f(0.5f,0.5f,1f),
new Point3f(1f,0.2f,0f));
ptlight.setInfluencingBounds(bounds);
root.addChild(ptlight);
return root;
}//Close branchgroup method
//Create the Mobius shape
private GeometryInfo mobius()
{
int m = 100; //number of row points
int n = 100; //number of col points
int p = 4*((m-1)*(n-1)); //faces * points per face
IndexedQuadArray iqa = new IndexedQuadArray(m*n,
GeometryArray.COORDINATES, p);
Point3d[] vertices = new Point3d[m*n];
int index = 0;
//Create vertices
for(int i = 0; i < m; i++)
{
for(int j = 0; j < n; j++)
{
double u = i * (2*(Math.PI))/(m - 1);
double v = -0.3 + (j * (0.6/(n-1)));
double x=(1+v*Math.cos(u/2))*Math.cos(u);
double y=(1+v*Math.cos(u/2))*Math.sin(u);
double z=v*Math.sin(u/2);
vertices[index]=new Point3d(x,y,z);
index++;
}//close nested for loop
}//close for loop
iqa.setCoordinates(0, vertices);
index = 0;
//set index for coordinates
for(int i = 0; i < m-1; i++){
for(int j = 0; j < n-1; j++){
iqa.setCoordinateIndex(index, i*m+j);
index++;
iqa.setCoordinateIndex(index, i*m+j+1);
index++;
iqa.setCoordinateIndex(index, (i+1)*m+j+1);
index++;
iqa.setCoordinateIndex(index, (i+1)*m+j);
index++;
}//close nested for loop
}//close for loop
//create geometry info and generate normals for shape
GeometryInfo gi = new GeometryInfo(iqa);
NormalGenerator ng = new NormalGenerator();
ng.generateNormals(gi);
return gi;
}
}