뫼비우스 스트립에는 솔기가 있습니다! Java3D

Question

Java3D에서 mobius 스트립을 만들고 있습니다. 나는 솔기가있어 그것을 제거 할 수없는 것 같아! 법선과 결합 된 에지 간의 각도 차이가 기술적으로 180이라는 사실을 가정합니다.이 솔기를 제거 할 수있는 사람이 있습니까?

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; 
     } 
    } 

Answer 1

더 설명 this question를 참조하십시오

여기 내 코드입니다. 다음 두 가지 변경 사항이 필요합니다.

ap.setPolygonAttributes(new PolygonAttributes(PolygonAttributes.POLYGON_FILL, PolygonAttributes.CULL_BACK, 0)); 

double u = i * (4 * (Math.PI))/(m - 1);