[JAVA3D] Dragging an object

[James Harrison]

I want to drag an object across the screen. So I thought this would work

                        .
                        .
                        .
                        x = ((MouseEvent)event[i]).getX();
                        y = ((MouseEvent)event[i]).getY();

                        Point3d position = new Point3d();
                        canvas3D.getPixelLocationInImagePlate(x, y, position);
                        Transform3D imagePlateToVworld = new Transform3D();
                        canvas3D.getImagePlateToVworld(imagePlateToVworld);
                        imagePlateToVworld.transform(position);

                        transformGroup.getTransform(transformX);

                        Transform3D translationDelta = new Transform3D();

                        Vector3f translation = new Vector3f();
                        translation.x = position.x-x_last;
                        translation.y = position.y-y_last;
                        transDelta.set(translation);

                        x_last = position.x;
                        y_last = position.y;

                        transformX.mul(viewPlaneTransform);
                        transformX.mul(translationDelta);
                        transformX.mul(viewPlaneTransformInverted);
                        transformGroup.setTransform(transformX);

The final transform is close, but no cigar if there is a  rotation in the
viewPlane transform.

I would appreciate any help on this.

Jim

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