How can I disable Hardware Occlusion Queries And Enable HZB Occlusion

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I want to enable HZB Occlusion ,so I must to Set r.AllowOcclusionQueries 1 and r.HZBOcclusion 1。but i set r.AllowOcclusionQueries 1 is also enable Hardware Occlusion Quries？how can i only enable HZB Occlusion