((ShadowVolume) volumes.get(v)).setUpdate(true);
volumes.get(v).setUpdate(true);
    public void setProjectionLength(float projectionLength) {        this.projectionLength = projectionLength;        // force update of volumes        for (int v = 0, vSize = volumes.size(); v < vSize; v++) {            ((ShadowVolume) volumes.get(v)).setUpdate(true);        }    }