public void PreRenderMeshes()
{
TexturesManager.Instance.clearAll();
OldRenderTarget = Device.GetRenderTarget(0);
OldDepthStencil = Device.DepthStencilSurface;
Surf = RenderTarget2D.GetSurfaceLevel(0);
Device.SetRenderTarget(0, Surf);
Device.DepthStencilSurface = DepthStencil;
Device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.Black, 1f, 0);
Device.BeginScene();
}