private void BeginPreviewInstance()
 {
     m_OldFog = RenderSettings.fog;
     Unsupported.SetRenderSettingsUseFogNoDirty(false);
     Handles.DrawCameraImpl(m_GUIRect, previewUtility.camera, DrawCameraMode.Textured, false, new DrawGridParameters(), true, false);
     PreviewRenderUtility.SetEnabledRecursive(paletteInstance, true);
 }