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In the Render Setup window, make sure the Production render engine is set to V-Ray. To open the VFB, click the Last VFB button on the V-Ray Toolbar, or go to the respective Render Setup rollout for V-Ray or V-Ray GPU engine.  


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When the Renderer is V-Ray, the IPR options rollout appears under the V-Ray tab.

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When the Renderer is V-Ray GPU, the IPR options appear under the Render settings rollout of the V-Ray tab.

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When the renderer is V-Ray, Viewport IPR is accessible through the Shading menu of the Viewport

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  1. To start IPR, click the Start interactive rendering button on the VFB toolbar. You can now make changes to the scene while the rendering continues, and the changes will be rendered automatically. 






  2. When the scene is rendering, the Start interactive rendering button changes to the Refresh interactive rendering button. Click this button to restart the rendering at any time. The progress bar at the bottom of V-Ray Frame Buffer tracks the rendering progress of the current scene.






  3. Use the Stop rendering button to stop V-Ray IPR. After stopping, you can click Start interactive rendering again to restart IPR.



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 Original Region Render

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 IPR refreshes as the Region Render area is altered.

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Viewport IPR

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Viewport IPR rendering offers a number of benefits to the production process.

It is accessible from the ||Viewport menu|| > Shading > V-Ray IPR.

Viewport IPR uses the currently set render engine (V-Ray Next or V-Ray GPU Next).

You can stop the interactive rendering from the same menu.

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 The Viewport IPR works only in versions of 3ds Max 2017/2018/2019.

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Notes

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  • V-Ray IPR will render V-Ray Render Elements, although it will not track changes to the render elements and the render will need to be refreshed.
  • V-Ray IPR doesn't support 3ds max default lights.
  • In the occasion V-Ray Viewport IPR option is not showing in the Shading menu, go to Customize > Customize User Interface... > Menus > Views - Shading Vewport Nitrous Label Menu, and add the Viewport IPR option from the Actions box. In case the option still does not appear in the Shading menu, delete the User Defined item from the same window.