public void preRotate(float angle, float ax, float ay, float az) {
Transform t = new Transform();
t.postRotate(angle, ax, ay, az);
t.postMultiply(orientation);
orientation.set(t);
}
public void setOrientation(float angle, float ax, float ay, float az) {
orientation.setIdentity();
orientation.postRotate(angle, ax, ay, az);
}
public void postRotate(float angle, float ax, float ay, float az) {
orientation.postRotate(angle, ax, ay, az);
}