如何在Java 3d中設置Universe的功能？

Question

如何在使用canvas3d對象創建的SimpleUniverse實例上設置邊界？

我試過下面的代碼，但是如果我嘗試設置邊界和「限制訪問異常」，如果我嘗試設置寫入邊界的能力，我會得到「能力未設置異常」。

這裏是我的代碼：

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); 

請幫幫忙！

Answer 1

我想通了。而不是設置像這樣的宇宙：

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

SimpleUniverse universe = new SimpleUniverse(canvas3d); 

我本身設置了ViewingPlatform，然後創建了它的宇宙：

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);