If you want to get that rough rock look and don't want to pay for oren nayar then a half lambert with a diffuse power can be pretty close.
Or adding a subtle fresnel to the diffuse calculation could be good. I noticed a lot of the Darksiders breakable stone urns have a little fresnel that helps soften them and fit in with the static environments.
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Or adding a subtle fresnel to the diffuse calculation could be good. I noticed a lot of the Darksiders breakable stone urns have a little fresnel that helps soften them and fit in with the static environments.