public List<ViewPort> getPreViews() {
        return Collections.unmodifiableList(preViewPorts);
    }
Returns a read-only list of all pre ViewPorts.

@return a read-only list of all pre ViewPorts
@see #createPreView(java.lang.String, com.jme3.renderer.Camera)
jme3-core/src/main/java/com/jme3/renderer/RenderManager.java