vboMap.expunge();
    public void displayBackBuffer() {        renderQueue();        if (Spatial.getCurrentState(RenderState.RS_ZBUFFER) != null                && !((ZBufferState) Spatial                .getCurrentState(RenderState.RS_ZBUFFER)).isWritable()) {            if (Spatial.defaultStateList[RenderState.RS_ZBUFFER] != null)                Spatial.defaultStateList[RenderState.RS_ZBUFFER].apply();            Spatial.clearCurrentState(RenderState.RS_ZBUFFER);        }        prevColor = prevNorms = prevVerts = null;        Arrays.fill(prevTex, null);        Spatial.clearCurrentStates();        GL11.glFlush();        if (!isHeadless())            Display.update();    }