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Ambient Occlusion (AO) in maya video tutorial


Occlusion map: is generate for showing depth and good effect on your models. Here is a simple tutorial for maya. If you use Maya then it will be very helpful to you. This Video tutorial covers the basics of how to setup the ambient occlusion shader Maya. As with most things in Maya there are probably many different ways to do this but this method works well for me and is reasonably quick to setup.
maya interior illumination ambient occlusion videotutorial maya interior illumination ambient occlusion videotutorial
In the first part of the video I will the color pass render, for learn more on how to do a color pass render with ibl and hdri please watch Use image based lighting in maya.
maya interior illumination ambient occlusion videotutorial In the second part of the video tutorial i will show you how to setup the mental ray ambient occlusion shader.

There are two main choices when using Ambient Occlusion: you can enable it as an effect in your shaders (using mia_material), or you can render a separate pass which you blend with your render in the compositing stage, using Photoshop for instance.

The benefit of the former is that the results will be more accurate and that you only need to make one scene-setup and render. The downside is that is difficult to 'tune' the effect. Re-rendering your entire image just to change the Ambient Occlusion effect may take quite some time. When using a separate AO-pass, it's quicker to tune your AO effect because rendering an OA-pass is typically pretty fast. Furthermore it allows more artistic freedom; you can fine-tune the AO effect during compositing (e.g.: in Photoshop).

Compositing the AO pass with your image in Photoshopmaya interior illumination ambient occlusion videotutorial


You should have two images:

  • The render with color information (also called color-pass). Preferably in TIFF format

  • An image with the Ambient Occlusion pass (AO-pass). Preferably in PSD format (or TIFF)


Open both images in Photoshop. Drag the layer from the AO-pass (from the Layers panel) to the color-pass image and position it. You can rename the layer to something more useful (eg: 'AO-pass').

Next we have to blend this layer with the color-pass:

  • Select the layer with the AO-pass.

  • Open the Blend-mode pull-down in the layers panel.

  • Choose Multiply. Alternatively you could choose Darken; the effect will be more subtle.



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