public void BeginFrame(DeviceContext context, double currentRealTime, float elapsedTime)
{
CurrentRealTime = currentRealTime;
CurrentElapsedTime = elapsedTime;
DXMan.ClearRenderTarget(context);
DXMan.SetDefaultRenderTarget(context);
SetRasterizerMode(context, RasterizerMode.SolidDblSided);
SetDepthStencilMode(context, DepthStencilMode.DisableAll);
SetDefaultBlendState(context);
}