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Overview

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V-Ray is a rendering plugin for Houdini. V-Ray offers a number of materials, textures, lights, utility nodes, volumetrics, and render elements specifically designed for а a smooth workflow.

V-Ray for Houdini includes two render engines: V-Ray and V-Ray GPU.

V-Ray is implemented in Houdini as a set of custom nodes, most notably the V-Ray Renderer node for Production rendering, and the V-Ray IPR node for Interactive rendering. V-Ray renderings display in the V-Ray Virtual Frame Buffer (VFB), which has a multitude of V-Ray specific tools for saving and comparing renderings, adding lens effects, and viewing render elements. For tools to adjust rendering quality and speed with V-Ray and V-Ray GPU, see the Renderer Node page.

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Rendering with V-Ray

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Both V-Ray and V-Ray GPU engines support Production and IPR Rendering modes. The Production Rendering mode utilizes all V-Ray's features and is intended to be used to create a clean production ready render. 

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You can have multiple cameras in a scene with different render settings. You can also have multiple V-Ray Renderer and V-Ray Renderer IPR nodes that are configured differently. Shift+Left-click on the Render/IPR (VFB) and ROP Parm/IPR ROP Parm shelf buttons allows you to select different ROP settings. Alternatively, press Shift + Left-click on the Show VFB shelf button to open a context menu of available ROP configurations in the scene.

To switch between different camera views, open the VFB and hold click on the Render button.

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When rendering from the Render to Disk button in the V-Ray Renderer node, the camera specified in the Camera slot is used. When rendering from the Render/IPR (VFB) toolbar buttons or the VFB's Render button, you can override the specified camera.

 

Starting V-Ray Render

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Make sure a camera is set. You can set several cameras in a scene and then switch between them.

Create a V-Ray Renderer node in the out Network using one of the following ways:

  • Go to Render menu > Create Render Node > V-Ray
  • ||out Network|| > V-Ray Renderer
  • Go to Render menu > Create Render Node > V-Ray

To learn how to start Interactive Production Rendering (IPR), see the Interactive Rendering page.

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Note that you can have multiple V-Ray Renderer and Renderer IPR nodes with different settings in a scene.

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  • In the V-Ray Shelf, click on the Render button. This initiates a render process in the VFB.
  • Go to V-Ray menu > Render > V-Ray ROP
  • In the V-Ray Shelf, click on the click the Show VFB button. Then in the VFB, click the Render button.
  • Go to V-Ray Renderer node settings and press click the Render to Disk button. 
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If vray/vray_ipr nodes are not aren't created in the out Network, pressing clicking the Render button or Show VFB button on the V-Ray Shelf automatically creates them botha vray node. If necessary, the render settings can be configured.

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Viewport Rendering

Make sure vray and vray_ipr nodes are created in the out Network. Create a camera in the Scene View.

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For more detailed information on how to configure the IPR settings, see the Interactive Rendering page.

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Notes

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  • When rendering or exporting a .vrscene with a heavy geometry or volumes in it that are not cached in an external file, a warning displays that heavy uncashed objects may slow down the rendering till the first pixel appears.