This page provides information on the V-Ray VRayProxy SOP.
VRayProxy imports geometry from an external mesh at render time only. The geometry is not present in the scene, and does not use up any resources. This allows the rendering of scenes with many millions of faces, more than Houdini itself can handle. The node can load alembic (.abc) and V-Ray proxy (.vrmesh) files.
If you wish to import a mesh through a VRayProxy node, the mesh must first be exported to a .vrmesh file. See the V-Ray Proxy Export page for details.
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 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" state. No further modifications to the mesh are expected. You can't apply modifiers to 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. Therefore, if you plan on doing modifications to the mesh, you should keep it in a Maya file (which may be different from the file that gets rendered in the end).
The VRayProxy node can also load and render Alembic files (.abc). The supported geometry types are polygonal meshes (without subdivision surfaces), spline curves and particles.
V-Ray recognizes velocity information for motion blur if it is stored either as standard Alembic velocity, or as a 3D vector array property called arbGeom.v, arbGeom.velocities or arbGeom.velocity. Additional Alembic color sets are imported as mapping channels with indices greater than 0 (i.e. 1, 2 etc). It's also possible to use such a color set for velocity. The VRayProxy has some additional parameters related to Alembic files.
It is recommended to use Houdini's native alembic loader. |
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