Replace objects with V-Ray Proxy
The .vrmesh is a special file format which contains all information of a mesh, needed to render it - vertices and face topology, as well as texture channels, face material IDs, smoothing groups, normals, etc. In addition, the mesh is preprocessed and subdivided into chunks for easier access.
It is important to realize that the mesh is in a "ready to render" format in terms of geometric state, therefore no further modifications to its geometry are possible.
To override an object with a V-Ray Proxy, press Replace objects with V-Ray Proxy/V-Ray Scene.
A dialog box will appear allowing you to search for V-Ray Proxy (.vrmesh) or alembic (.abc) files. Once you have selected a file, the following options become available:
Scale – Allows you to scale the V-Ray Proxy.
Rotation – Allows you to rotate the V-Ray Proxy around its vertical axis.
Flip Axis – Allows you to flip the V-Ray Proxy around its horizontal axis.
Randomize – Defines scale and rotation range (min/max) for the selected items to be randomized. Use the Refresh button on the right to choose between random combinations.
Material 0/1 – Allows you to assign a V-Ray material to the V-Ray Proxy.
Width/Height – Sets the width and the height of the V-Ray material.
Rotation – Rotates the V-Ray material (in degrees).
Offset V/H – Controls the V-Ray material offset in the vertical (V) and horizontal (H) direction.