Occlusion tutorial - Documentation & Online Help

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Copyright Information Copyright c○ 1986-2011 mental images GmbH, Berlin, Germany. All rights reserved. This document is protected under copyright law. The contents of this document may not be translated, copied or duplicated in any form, in whole or in part, without the express written permission of mental images GmbH. The information contained in this document is subject to change without notice. mental images GmbH and its employees shall not be responsible for incidental or consequential damages resulting from the use of this material or liable for technical or editorial omissions made herein. mental images ❝ , mental ray ❝ , mental matter ❝ , mental mill ❝ , mental queue ❝ , mental cloud TM , mental mesh ❝ , RealityServer ❝ , RealityPlayer ❝ , RealityDesigner ❝ , MetaSL ❝ , Metanode ❝ , Phenomenon ❝ , neuray ❝ , iray ❝ , DiCE TM , imatter ❝ , Shape-By-Shading ❝ , SPM ❝ , and rendering imagination visible TM are trademarks or, in some countries, registered trademarks of mental images GmbH, Berlin, Germany. Other product names mentioned in this document may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.
Table of Contents 1 Occlusion 1 1.1 Intro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Further resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 What is Occlusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Usage of Occlusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 The occlusion shaders set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.4.1 Example uses of the occlusion shaders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.4.1.1 Ambient (or diffuse) occlusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.4.1.2 Diffuse, environment sampled, occlusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4.1.3 Reflective, environment sampled, occlusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.4.1.4 Bent normals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.5 Using mib amb occlusion as a light shader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.6 Ambient Occlusion vs. standard Final Gathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1.6.1 Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 1.7 Ambient Occlusion using Final Gathering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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