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Meshes are exported to a special .vrmesh file format. It contains all geometric information for a mesh – vertices and face topology, as well as texture channels, face material IDs, smoothing groups, normals – in short, everything that is needed to render the mesh. In addition, the mesh is pre-processed and subdivided into chunks for easier access. The file also contains a simplified version of the mesh used for preview purposes in the viewport. 

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UI Text Box
typeinfo

All geometry types support motion blur. If the mesh/hair topology or particle count are not changing, then precise motion blur is computed. Otherwise, a velocity channel must be provided in the file to describe the motion blur.

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Fancy Bullets
typecircle
  • Velocity channel - It is always computed for animations with homogeneous topology. Otherwise, it is read from the standard alembic velocity property in units/second. Alternatively, it is in units/frame in a geometry property specified in "velocity_color_set" GeomMeshFile plugin parameter, or in geometry property named “v”, “velocities”, “velocity”, “Velocity”;
  • Material IDs - Provided by per face uin32 uint32 property named “.materialids” or by alembic face sets. Each face set name, which start with a non-negative integer will assign , assigns this integer as material id. Face set names, which do not start with an integer, receive consecutive material ids;
  • Normals - If “compute_normals” is on, then normals are always computed with the given “smooth _ angle” parameter. Otherwise they are read from the alembic default property for normals. If they are not written, then geometric normals are used;
  • UV channels - All vector2 float/double properties in ArbGeomParams that start with “uv” are sorted and listed as UV sets. The default UV set comes first with name “uv”;
  • Color channels - All vector3, color3 and color4 properties are represented as three component color channels. All other scalar geometry properties are packed into three component colors.

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Fancy Bullets
typecircle
  • Velocity channel - It is always computed for animations with homogeneous topology. Otherwise, it is read from the standard alembic velocity property in units/secondseconds;
  • Hair width - Either written as standard alembic property expressed as diameter or written as radius in the “.radius” property;
  • UV channels - All vector2 float/double properties in ArbGeomParams that start with “uv” are sorted and listed as UV sets. The default UV set comes first with the name “uv”. UVs can be per vertex of or per strand. 

Particle Objects

Fancy Bullets
typecircle
  • Velocity channel - It is always computed for animations with homogeneous topology. Otherwise, it is read from the standard alembic velocity property in units/secondseconds;
  • Particle width - It is either written as standard alembic property expressed as a diameter or written as a radius in the “.radius” property.


The V-Ray Proxy has some additional parameters related to Alembic files. See the Alembic Proxy Parameters section of the V-Ray Proxy page for more details. 

Notes

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Fancy Bullets
typecircle

  • .vrmesh files exported from Cinema 4D can be rendered outside of Cinema 4D- for example, by the standalone version of V-Ray, or V-Ray for 3ds Max and any other application supported by V-Ray.

  • You can convert .ply, .obj, .geo and .bin files to .vrmesh files with the help of the ply2vrmesh converter the ply2vrmesh converter tool.

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Fancy Bullets
typecircle