effectDeferredShading.Parameters["lightPosition"].SetValue(new Vector3(0,10,0));
effectDeferredShading.Parameters["lightColor"].SetValue(Color.Red.ToVector3());
effectDeferredShading.Parameters["viewPosition"].SetValue(cameraEntity.position);

effectDeferredShading.Parameters["texPosition"].SetValue(renderTargets[1].RenderTarget);
effectDeferredShading.Parameters["texNormal"].SetValue(renderTargets[1].RenderTarget);
effectDeferredShading.Parameters["texColor"].SetValue(renderTargets[2].RenderTarget);

effectDeferredShading.CurrentTechnique.Passes["Lighting"].Apply();