This page provides a step-by-step guide to setting up and using V-Ray Proxies.

 

Page Contents

 

Introduction


In this Quick Start tutorial we will take an introductory look at V-Ray Proxy Objects. In this tutorial we will take a look at how to use proxies in V-Ray to handle high density geometry and to improve file input/output.

To follow this tutorial, you will need to have the V-Ray for Modo plugin installed. This tutorial is a companion to go along with the QuickStart video posted on our YouTube channel.

 


Tutorial Assets


To download the files used in this tutorial, please click on the button below.

 

Tutorial Steps


1) Open a high polygon count file in Modo

To get started, download the Thai Statue model from the The Stanford 3D Scanning Repository. Open the .obj version in a new Modo scene.

Make a note of the time it takes for the file to open. Working with this file would be very inconvenient because every time you open, save or work with the file, the very high polygon count would cause long delays. 

Working with proxies can help alleviate this problem.

 

Note: the "Thai Statue" model is from the Stanford scanning repository (  http://graphics.stanford.edu/data/3Dscanrep/  ).

 

 


Load time in Modo



2) Convert the mesh to a V-Ray Proxy

With your mesh still in the viewport, select it and go to the V-Ray menu and choose Convert to V-Ray Proxy.

 

 

Specify a path and a file name, and save your mesh as a proxy.

 

 

Then you can delete the mesh from the scene, and from the Item List Menu go to Add Item > V-Ray Geometry > V-Ray Proxy.

 

 

In the properties for the V-Ray proxy, click the Browse button and locate the proxy mesh you just created (it will be in the .vrmesh format).

Note that the mesh density has been reduced by a factor of 10. This only applies in the viewport; at render time the full mesh resolution will be used.

 

 

 

3) Convert geometry without opening it in Modo first

In V-Ray you can also convert geometry without ever having to open it in Modo first, saving you a lot of time.

From the The Stanford 3D Scanning Repository you can download some of the models in .ply format. These can be converted directly into proxies. The available models are the armadillo, the Thai statuette, the Chinese dragon, and the manuscript.

In a new scene, add a new V-Ray Proxy from the Item List menu, and in the V-Ray Proxy properties click Convert and load non-vrmesh geometry file and select one of the .ply files downloaded from the Stanford Scan Repository.

 

 

Your item is now converted to a proxy and the whole operation was performed much faster than it would have been if you had to open the file in Modo first.

 

NOTE

The Convert and load non-vrmesh geometry file command can also load .obj and .abc (Alembic) formats in addition to .ply.

 

4) Render a 30 million polygon scene

Open the included Modo scene, and note the four proxy items. The viewport has just under 40,000 polygons displaying, but at render time there will be a total of 30 million polygons.

Start V-Ray RT and note that there is no difficulty rendering the scene despite the high polygon count.

 

Note: the "Armadillo", "Asian Dragon", and "Thai Statue" models are from the Stanford scanning repository ( http://graphics.stanford.edu/data/3Dscanrep/ ).