mental ray Architectural and Design Visualization Shader Library

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108 5 General Utility ShadersThis is better, but still nowhere near a “smooth” glossy reflection. The 100 samples made therendering an order of magnitude slower, and it is still not enough! What can we do?What we want to is not look up the environment multiple times. Not 8 times, nor 100 times,but once, except we want that lookup to already contain the desired blur!This is accomplished by enabling the single env sample parameter of mia materialand thenapply mia envblur as our environment shader and our “original” environment map as theenvironment parameter of mia envblur.Going back to our original 8 glossy samples, the following result can be rendered, very quickly:Glossy reflections using mia envblurThis looks much better, and renders much faster, but the level of blur is constant. A much moreadvanced way is to let mia envblur derive the blur to apply by enabling mia material blur.Assume we have applied the following map to the refl gloss parameter of the mia material:
5.2 Environment Blur 109Glossiness mapThe resulting render, with the help of mia envblur will be this:Mapped glossiness via mia material blurPlease note that mia envblur shader only supports isotropic lookups, and will ignore anyanisotropy parameters of mia material when using it like this.Also, do not forget to use the single env sample feature; just blurring the environment mapis often not enough to combat the noise.
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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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2.6 Tips and Tricks 55• Glass-Liq
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Page 65 and 66: 2.6 Tips and Tricks 59Many small ad
Page 67 and 68: Chapter 3Sun and Sky3.1 Introductio
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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 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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