public void Begin(EntityWorld world)
{
for(int i=0;i<_randomFloats.Length;i++)
_randomFloats[i] = _rng.NextFloat(0, 1);
_totalTime += (ulong)world.Delta;
_world = world;
_lastRasterizerState = _device.RasterizerState;
var _camera = world.GetActiveCamera();
_effect.World = Matrix.Identity;
_effect.Projection = _camera.ProjectionMatrix;
_effect.View = _camera.GetViewMatrix(1.0f);
_batch.Begin(_effect);
}