04/08/2011

Ambient Occlusion with V-Ray

Ambient Occlusion with V-Ray from Tiago Alexandrino on Vimeo.

Post-production work is a critical part of the workflow of many 3D software users. This procedure can dramatically improve the realism and quality of your still images, wich automatically enables any user to create professional visualisations.

For this purpose, I have made a tutorial to show you the importance of the Ambient Occlusion pass using V-Ray and Autodesk 3ds Max.

15 Comments

  1. That way works well, but it requires an extra step for output. Why not just go into the render elements tab, and a vray extra texture? From there you can assign a vray dirt mapt. Not only can you avoid using on override material, but the map will already be rendered with the regular pass. Then all you have to do is save it from your vray render window.

    • Hi Jared,

      Yes you could do that but it does add to your render times, especially if you increase the subdivisions for the Vray Dirt map.

      If you have the time to include that then yes it would be the better option but if time is against you the above would be a much faster solution.

  2. Is clear if that you have a long time to work on a project, working with elements will always be a better option to increase your AO quality too.

    But in this tutorial, the aim was to demonstrate one way to create this process quickly and efficiently, and even easier to people who are currently learning how to use V-ray Renderer.

  3. I have not done passes too much yet, but I know u can get AO in two ways:

    1. Create an environment light (you can find it on the lighting shelf) and switch your lighting from “direct light” to “ambient occlusion”, the tune the settings. Make sure no other light is on the scene, and you should have an ambient occlusion render

    2. Add an occlusion operator inside of any of your material networks as the input for the diffuse color (I.e you could do this on one of the flat surface materials in the material gallery), and assign it to all the objects of your scene for that pass

  4. Dude, thank you for this gem! i have a question. what render settings is recommended for AO? same high quality as the original image or test rendering settings is sufficient?

  5. Hello Javed,

    The quality of your settings should not be your main concern. Of course they also relevant to the final image, but in this case, you have to give more attention to the samples of the V-ray Light Mtl and V-ray Dirt too to achieve more diffuse shadows and high contrast and white and black tones.

  6. Thanks for the post….
    And i have a problem if you can help me out with please:
    when i render my scene ,the rendered image lose too much color after saving it and it’s totally washed out i save the image with (png)file type ,is there a better file type to save my image with? thanks for helping

  7. Probably your problem is related with the gamma setup you are using. Maybe your V-Ray settings are not well adjusted.

    Try to work always in gamma 2.2. I think that in this case the image format that you are using it’s not the problem of the image getting washed.

    But for me, the best formats to save the renders and the render elements/passes are TIFF and TGA.

    Because with this two formats you can save the exposure of the image and you don’t lose so many information as you lose with a PNG or JPEG.

    Hope it helped you in some way, if you need something else, feel free to ask ;)

    Cheers
    Tiago Alexandrino

  8. Thanks for the tutorial.
    Is there a solution to get an override render element done at the same time than the beauty pass?
    Same question for Vraytoon.
    Thanks

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