Lighting, Fog, and Background - Interactive Web-Based Virtual Reality with Java 3D - page 116

Figure 2. Face normal and vertex normal

Vertex normal

Face normal 2

Face normal 1

Figure 3. Setting the normal manually and automatically

1. private Geometry plane() {

2. TriangleFanArray tfa;

3. int strip[] = {4};

4. Point3f co[] = new Point3f[4];

5. Color3f col[] = new Color3f[4];

6. Vector3f v[] = new Vector3f[4];

7. for (int i = 0; i<=3; i++) {

8. col[i] = blue;

v[i] = new Vector3f( 0f, 1f, 0f); } // all normal of z plane are the same

9. co[0]=new Point3f(0f,0f,0f);

10. co[1]=new Point3f(x,y,z);

11. co[2]=new Point3f(x,y1,z);

12. co[3]=new Point3f(x,y1,z1);

13. tfa=new TriangleFanArray(4,TriangleFanArray.COORDINATES|TriangleFanArray.COLOR_3|

14. TriangleFanArray. NORMALS,strip);

15. tfa.setCoordinates(0,co);

16. tfa.setColors(0,col);

17. tfa.setNormals(0,v);

18. return tfa; }

1. private Geometry getnormal(Geometry g) {

2. GeometryInfo gi = new GeometryInfo(g);

3. NormalGenerator ng = new NormalGenerator();

4. ng.generateNormals(gi);

5. return gi.getGeometryArray(); }