Examples of javax.media.j3d.Transform3D

javax.media.j3d.Transform3D
A generalized transform object represented internally as a 4x4 double-precision floating point matrix. The mathematical representation is row major, as in traditional matrix mathematics. A Transform3D is used to perform translations, rotations, and scaling and shear effects.
A transform has an associated type, and all type classification is left to the Transform3D object. A transform will typically have multiple types, unless it is a general, unclassifiable matrix, in which case it won't be assigned a type.
The Transform3D type is internally computed when the transform object is constructed and updated any time it is modified. A matrix will typically have multiple types. For example, the type associated with an identity matrix is the result of ORing all of the types, except for ZERO and NEGATIVE_DETERMINANT, together. There are public methods available to get the ORed type of the transformation, the sign of the determinant, and the least general matrix type. The matrix type flags are defined as follows:
- ZERO - zero matrix. All of the elements in the matrix have the value 0.
- IDENTITY - identity matrix. A matrix with ones on its main diagonal and zeros every where else.
- SCALE - the matrix is a uniform scale matrix - there are no rotational or translation components.
- ORTHOGONAL - the four row vectors that make up an orthogonal matrix form a basis, meaning that they are mutually orthogonal. The scale is unity and there are no translation components.
- RIGID - the upper 3 X 3 of the matrix is orthogonal, and there is a translation component-the scale is unity.
- CONGRUENT - this is an angle- and length-preserving matrix, meaning that it can translate, rotate, and reflect about an axis, and scale by an amount that is uniform in all directions. These operations preserve the distance between any two points, and the angle between any two intersecting lines.
- AFFINE - an affine matrix can translate, rotate, reflect, scale anisotropically, and shear. Lines remain straight, and parallel lines remain parallel, but the angle between intersecting lines can change.
A matrix is also classified by the sign of its determinant:
The Java 3D model for 4 X 4 transformations is:
Note: When transforming a Point3f or a Point3d, the input w is set to 1. When transforming a Vector3f or Vector3d, the input w is set to 0.

  private Transform3D getModelRotationTransform() {
    float [][] modelRotation = this.controller.getModelRotation();
    Matrix3f modelRotationMatrix = new Matrix3f(modelRotation [0][0], modelRotation [0][1], modelRotation [0][2],
        modelRotation [1][0], modelRotation [1][1], modelRotation [1][2],
        modelRotation [2][0], modelRotation [2][1], modelRotation [2][2]);
    Transform3D transform = new Transform3D();
    transform.setRotation(modelRotationMatrix);
    return transform;
  }

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    frame.getContentPane().add("Center", canvas);
    
    peerComponent=frame;
    peerWindow=frame;  


    transform=new Transform3D();
    // avoids cumulative rounding errors
    // This should avoid "non-congruent transform above view transform" exception
    // Warning: In some cases, this exception still appears. This is a known J3D bug, that
    // should hopefully be corrected in J3D v1.4
    transform.setAutoNormalize(true); 
    tempTransform=new Transform3D();
    
    viewingPlatform = scene.getUniverse().getViewingPlatform();
    
    viewer = viewingPlatform.getViewers()[0];
    view = viewer.getView();

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        // Create the TransformGroup node and initialize it to the
        // identity. Enable the TRANSFORM_WRITE capability so that
        // our behavior code can modify it at run time. Add it to
        // the root of the subgraph.
        TransformGroup objTrans = new TransformGroup();
        Transform3D t3dTrans = new Transform3D();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objTrans.setTransform(t3dTrans);
        objRoot.addChild(objTrans);
        BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0),
                100.0);

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    // TODO get platform and view according to persitent info and plugin support
    public ViewTransform(ViewingPlatform viewingPlatform) {
        _viewingMode = ROTATION_MODE;
        _viewingPlatform = viewingPlatform;
        _transform = new Transform3D();
        // avoids cumulative rounding errors
        // This should avoid "non-congruent transform above view transform"
        // exception
        _transform.setAutoNormalize(true);
        _tempTransform = new Transform3D();
        _zoom = new Matrix4f();
        _zoom.setIdentity();
        _rot = new Matrix4f();
        _rot.setIdentity();
        _trans = new Matrix4f();

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        res._drotX=new Matrix4f(_drotX);
        res._drotY=new Matrix4f(_drotY);
        res._trans=new Matrix4f(_trans);
        res._vtrans=new Vector3f(_vtrans);


        res._transform = new Transform3D();
        res._transform.setAutoNormalize(true);
        res._tempTransform = new Transform3D();
        
        res._viewingPlatform=null;


        res._zoomAccumulator=null;

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    }
    
    private void readObject(java.io.ObjectInputStream in)
                 throws IOException, ClassNotFoundException{
        in.defaultReadObject();
        _transform = new Transform3D();
        _transform.setAutoNormalize(true);
        _tempTransform = new Transform3D();
        
        _viewingPlatform=null;


        _zoomAccumulator=null;
    }

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        return TransformValues.get(_oldValue, kind);
    }


    public void setNewValues(double[] values, TransformValues kind) {
        if (_newValue == null) {
            _newValue = new Transform3D();
        }
        kind.set(_newValue, values);
        compare();
        if (_changed)
            setPropertyValue(_newValue);

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            return TransformValues.get(getPropertyValue(), kind);
        }


        @Override
        public Transform3D getPropertyValue() {
            Transform3D t1 = new Transform3D();
            _object.getTransform(t1);
            return t1;
        }

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    // and translate it to the origin
    Bounds bounds = transformGroup.getBounds();
    if (bounds instanceof BoundingSphere) {
      Point3d center = new Point3d();
      ((BoundingSphere)bounds).getCenter(center);
      Transform3D tr = new Transform3D();
      tr.setScale(10.0/((BoundingSphere)bounds).getRadius());
      Transform3D tr2 = new Transform3D();
      center.negate();
      tr2.setTranslation(new Vector3f(center));
      tr.mul(tr2);
      transformGroup.setTransform(tr);
    }


    // Cleanup file name, use it for this node

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  public void restoreTransform(TransformGroup group, TransformGroupNode node){
    super.restoreTransform(node);
    this.group = group;
    
    composedTrans =  new Transform3D();
    trans = new Transform3D();
    group.getTransform(trans);
    updateTransform();
    group.setTransform(trans);
    if (node!=null) node.setDirty();
  }

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