[JAVA3D] QuadArray and generating normals (for lighting)

[Ben Logan]

Hi
Could somebody take a quick look at the code below and explain how I
generate the normals - so that I can light these walls that im creating.
I used to generate geomtery differently and then use a normal
generator...but I don't know how to apply that to a quad array etc
Any help would be appreciated,

Thanks...

public void buildWall(int from, int to) {
    QuadArray plane = new QuadArray(4, GeometryArray.COORDINATES
                                    |
GeometryArray.TEXTURE_COORDINATE_2);

    Point3f[] pts = new Point3f[4];

    plane.setCoordinate(0, gridPoints[from]);

    plane.setCoordinate(1, gridPoints[to]);

    float x1 = gridPoints[to].x;
    float y1 = gridPoints[to].y;
    float z1 = gridPoints[to].z;
    plane.setCoordinate(2, new Point3f(x1, y1 + height, z1));

    float x = gridPoints[from].x;
    float y = gridPoints[from].y;
    float z = gridPoints[from].z;
    plane.setCoordinate(3, new Point3f(x, y + height, z));

    TexCoord2f q = new TexCoord2f();
    q.set(0.0f, 0.0f);
    plane.setTextureCoordinate(0, 0, q);
    q.set(1.0f, 0.0f);
    plane.setTextureCoordinate(0, 1, q);
    q.set(1.0f, 1.0f);
    plane.setTextureCoordinate(0, 2, q);
    q.set(0.0f, 1.0f);
    plane.setTextureCoordinate(0, 3, q);

    Shape3D wall = new Shape3D();

    wall.setGeometry(plane);

    Appearance appear = new Appearance();
    appear.setMaterial(new Material());

    //NormalGenerator ng = new NormalGenerator();

    //ColoringAttributes redColoring = new ColoringAttributes(red,
ColoringAttributes.SHADE_FLAT);
    //appear.setColoringAttributes(redColoring);

    appear.setPolygonAttributes(poly);

    TextureLoader texLoader = new TextureLoader("bricks.jpg", null);
    Texture2D texture = (Texture2D) texLoader.getTexture();

    TextureAttributes texAttr = new TextureAttributes();
    texAttr.setTextureMode(TextureAttributes.MODULATE);

    //appear.setTexture(texture);
    //appear.setTextureAttributes(texAttr);

    wall.setAppearance(appear);

    wallGroup.addChild(wall);
  }




********************************************
Ben Logan - Graduate Software Engineer
RCID
Stephenson Building
Newcastle Upon Tyne
NE1 7RU
www.rcid.ncl.ac.uk
******************************************** 

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