如何在Java 3d中设置Universe的功能？

Question

如何在使用canvas3d对象创建的SimpleUniverse实例上设置边界？

我尝试了下面的代码，但如果我尝试设置边界，我会得到“Capability not set exception”，如果我尝试设置写入边界的能力，我会得到“Restricted access exception”。

这是我的代码：

GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3d = new Canvas3D(config);
SimpleUniverse universe = new SimpleUniverse(canvas3d);
ViewingPlatform viewPlatform = universe.getViewingPlatform();

// Below line throws RestricedAccessException
viewPlatform.setCapability(ViewingPlatform.ALLOW_BOUNDS_WRITE); 
// I want to set the bounds, thus the need for the capability above
viewPlatform.setBounds(bounds);

请帮忙！

Answer 1

我明白了。而不是像这样设置宇宙：

GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3d = new Canvas3D(config);

SimpleUniverse universe = new SimpleUniverse(canvas3d);

我自己设置了ViewingPlatform，然后用它创建了宇宙：

GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
Canvas3D canvas3d = new Canvas3D(config);

ViewingPlatform viewingPlatform = new ViewingPlatform();
viewingPlatform.setCapability(ViewingPlatform.ALLOW_BOUNDS_WRITE);
viewingPlatform.setBounds(bounds);
Viewer viewer = new Viewer(canvas3d);    

SimpleUniverse universe = new SimpleUniverse(viewingPlatform, viewer);