Ambient Occlussion Pass Tutorial

Want to know what is ambient occlussion is? and how to use it? This great Ambient Occlussion Tutorial created by Ziv Qual. Word from author “In this tutorial I will try to cover everything you need to know about occlusion pass in 3 simplified parts. The first part is explains what an occlusion pass is and what its good for. The second part is all the technical info on how to make an occlusion pass, the third part explains how to use occlusion pass.
WHat is occlusion ?
To simplify the explanation, just think of a situation when all your objects have a simple white color and your scene is lit equally from all directions by a white light. Basically this should result in a blank white image, but what happens when some objects block a certain amount of rays that should have gotten to other objects ? those rays don’t reach the other object and as a result, the parts where the rays were blocked will become darker. The more rays blocked, the darker the surface will be. So basically what we get is a white image with dark areas where geometry intersects with itself.
Why using it ?
The resulting occlusion pass gives very accurate and smooth shadows that resemble the result of global illumination. Compositing these shadows over your final render can significantly improve your image in many ways,it can mainly improve your shadows, give more depth to your scene and really helps to better show all the details of your models.

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