DisplaySystem.getDisplaySystem().getRenderer().deleteVBO(getVertexBuffer()); DisplaySystem.getDisplaySystem().getRenderer().deleteVBO(getNormalBuffer());
   public void updateFromHeightMap() {       if (!hasChanged()) return;       Vector3f point = new Vector3f();       for (int x = 0; x < size; x++) {           for (int y = 0; y < size; y++) {                point.set(x * stepScale.x, heightMap[x + (y * size)]                        * stepScale.y, y * stepScale.z);               BufferUtils.setInBuffer(point, vertBuf, (x + (y * size)));           }       }       buildNormals();       if (vboInfo != null) {           vboInfo.setVBOVertexID(-1);           vboInfo.setVBONormalID(-1);       }   }