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This page provides information on the import and export of a V-Ray Proxy in Cinema 4D.
Overview
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Meshes are exported to a special .vrmesh file format. This file contains all geometric information for a mesh such as vertices and face topology as well as texture channels, face material IDs, smoothing groups, and normals. In short, everything that is needed to render the mesh is included in the file. In addition, the mesh is preprocessed and subdivided into chunks for easier access. The file also contains a simplified version of the mesh used for preview purposes in the viewports.
It is important to note that the mesh is in a "ready-to-render" format. No further modifications to the mesh are expected. You can't change the mesh, or animate it in any way other than animating the position/orientation of the proxy object. There is no way to recover the original mesh from a .vrmesh file (this can be done in principle, but with some limitations). Therefore, if you plan on doing modifications to the mesh, you should keep it in a Cinema 4D file (which may be different from the file that gets rendered in the end).
The proxy import process creates a VRayProxy node, which references geometry from a file on disk. The node can load V-Ray proxy (.vrmesh) and Alembic (.abc) files. After the V-Ray proxy is imported, its parameters are accessible in the V-Ray Proxy Manager.
Before you can import a mesh through a proxy object, you need to save (export) the mesh to file first. This can be done either from the Cinema 4D user interface.
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Export V-Ray Proxy
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V-Ray Proxy Export Options
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Import V-Ray Proxy
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