/**
* Transforming the modelview matrix with the Rift's head rotation causes the {@link
* OrbitView#focusOnViewportCenter()} method to focus on the center of the viewport, which means
* the view jumps around depending on the head rotation. This method calls the focus method using
* an untransformed modelview matrix, keeping the center rotation point more consistent.
*
* @param dc
*/
protected void fixViewportCenterPosition(DrawContext dc, DrawableSceneController sc) {
dc.setViewportCenterPosition(null);
Point vpc = dc.getViewportCenterScreenPoint();
if (vpc == null) {
return;
}
try {
disableHeadTransform = true;
sc.applyView(dc);
dc.enablePickingMode();
List<Point> points = Arrays.asList(new Point[] {vpc});
List<PickedObject> pickedObjects = dc.getSurfaceGeometry().pick(dc, points);
if (pickedObjects == null || pickedObjects.size() == 0) {
return;
}
dc.setViewportCenterPosition((Position) pickedObjects.get(0).getObject());
} finally {
disableHeadTransform = false;
sc.applyView(dc);
dc.disablePickingMode();
}
}
