mental ray Architectural and Design Visualization Shader Library

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106 5 General Utility ShadersIt is important to remember that mia envblur does a one time rasterization of theenvironment shader at start up time. This means that that shader must be constant acrossthe scene, and cannot be a complicated position-dependent blend of environment shaders. Theenvironment can still change over time, since the rasterization step is performed anew eachframe.5.2.2 Use CasesThe environment blur shader mia envblur is intended to increase quality and performance ofrenderings that are largely reflecting the mental ray environment (i.e. that do not primarilyreflect other objects).The shader is primarily useful in product visualization renderings that are surrounded by anHDRI environment map for reflections, and also for visual effects work where one wants tohelp integrate CG objects in a real scene with the help of HDRI reflections, and want a smoothyet fast lookup.The shader is not as useful for interior architectural renderings, since in those (enclosed)scenes, most reflection rays are bound to hit other objects; the purpose of this shader is tohelp reflection rays that do not hit other objects, i.e. the largest benefit is in an “open” scene 1 .Object reflecting an environment mapHere an example object is reflecting an environment map 2 with no glossiness (i.e. perfectmirror reflection). This looks fine, because there is no quasi-random sampling performed.1 It is also very useful combined with using refl falloff dist in mia material.2 The “Galileo’s tomb” probe from www.debevec.org, which contains many small bright areas that tend tobe troublesome in this context.
5.2 Environment Blur 107But what is we want to make a glossy reflection? If one simply uses the glossy reflection ofmia material one receives the following result:Glossy reflection with 8 samplesIt is obvious that the default 8 glossy reflection samples are nowhere near enough, especiallywith an environment map with such high contrasts in it. Trying with 100 glossy samples (ata large performance hit) the result is:Glossy reflection with 100 samples
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mental ray Architectural and Design
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Table of Contents1 Introduction 11.
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Table of Contentsix3.8.3 Examples .
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Chapter 2Architectural Material2.1
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2.2 Fundamentals 52.2.1.1 A Note on
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2.3 Features 7Hence, when using GI:
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2.3 Features 9The rules are as foll
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2.3 Features 11In the real world
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2.3 Features 13Used alone, an AO sh
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2.3 Features 152.3.7 Performance Fe
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2.4 Quick Guide to the Material Par
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2.5 Detailed Description of Materia
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2.6 Tips and Tricks 49• For extre
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2.6 Tips and Tricks 51Diagram for g
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2.6 Tips and Tricks 53There is one
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Page 63 and 64: 2.6 Tips and Tricks 57Enjoy the tro
Page 65 and 66: 2.6 Tips and Tricks 59Many small ad
Page 67 and 68: Chapter 3Sun and Sky3.1 Introductio
Page 69 and 70: 3.4 Common Parameters 633.3 Importa
Page 71 and 72: 3.5 Sun Parameters 65• saturation
Page 73 and 74: 3.6 Sky Parameters 67light"sun",# T
Page 75 and 76: 3.6 Sky Parameters 69• sun direct
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Page 89 and 90: 3.9 Photometric Lights 833.9 Photom
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Page 115 and 116: 5.2 Environment Blur 109Glossiness
Page 117 and 118: 5.3 Light Surface 111An example of
Page 119 and 120: 5.3 Light Surface 113the other two
Page 121 and 122: 5.3 Light Surface 115Complex geomet
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