What is this caused by?
private WaterRenderPass makeWater()
{
water = new WaterRenderPass(cam, 6, false, true);
water.setWaterPlane(new Plane(new Vector3f(0f, 3f, 0f), 0f));
water.setClipBias(-1f);
water.setReflectionThrottle(0f);
water.setRefractionThrottle(0f);
myWater = new Quad("myWater", 3, 3);
FloatBuffer normBuf = myWater.getNormalBuffer(0);
normBuf.clear();
normBuf.put(0).put(1).put(0);
normBuf.put(0).put(1).put(0);
normBuf.put(0).put(1).put(0);
normBuf.put(0).put(1).put(0);
water.setWaterEffectOnSpatial(myWater);
rootNode.attachChild(myWater);
water.setReflectedScene(rootNode);
water.setReflectedScene(skybox);
water.setSkybox(skybox);
pManager.add(water);
return water;
}