There are times you want to draw nodes into an image so that you can later muck with the pixels or save it to disk.

requirements:
* must allow drawing into an image that you can retrieve pixel values from
* must be able to save to disk (enabled by the above)
* does not need to be hardware accelerated
* does not need to support drawing nodes already in a scene (if that would make it harder)
* this is likely a desktop only feature so it can be in the desktop profile and use java2d apis.

API Proposal

javafx.ext.swing.SwingUtils {
//add script level function
public function drawToImage(node:Node,image:BufferedImage);
}

then the developer can use the standard Java2D apis to grab and manipulate pixels, save to disk, and convert back into a JavaFX image.