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Expand – Opens a floating dialog that contains the selected rollout and automatically folds the command panel rollout.

Re-Center – Resets the position of the floating rollout.

? – Opens up the help documents for the Input Rollout.

Preview & Render Cache Path – Specifies the cache file name in one of the three volumetric formats that VRayVolumeGrid supports (OpenVDB, Field3D, PhoenixFD). If the file was specified when the VRayVolumeGrid object was created, the filename appears here. For a sequence of frames, the file name can contain format specifiers to describe a sequence of files. Environment variables can be used as well, which is explained in the Using Environment Variables with Cache Paths section below. VRayVolumeGrid supports multiple format specifiers:

<frame0n>, where n is an integer specifying the number of digits, and the optional 0 specifies padding with zeros. For example, if you enter cache_<frame04>.vdb as the file name, this is expanded to cache_0000.vdb for frame 0, cache_0001.vdb for frame 1, and so on. The same logic is used for VRayMesh.

# symbols are replaced with the current frame number. Multiple symbols can be used to specify the number of digits in the file name. For example cache_###.vdb is expanded to cache_001.vdb for frame 1.

The form %xd is a deprecated form that can no longer be entered, but works with older .vrscenes that already use this format. The form is resolved to the current Maya frame. The  x,  when present, specifies the minimum number of symbols for the frame number. For example, if the current frame is 9:

%d resolves to "9"
%3d resolves to "··9"
%03d resolves to "009"

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