mental ray Architectural and Design Visualization Shader Library

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26 2 Architectural MaterialA transparency of 0.75 and a refr trans w of 0.0 (left), 0.5 (center) and 1.0 (right)• If refr trans w is 0.0, all of the transparency is used for transparency.• If refr trans w is 0.5, half of the transparency is used for transparency and half isused for translucency.• If refr trans w is 1.0, all of the transparency is used for translucency and there is noactual transparency.The translucency is primarily intended to be used in “thin walled” mode (as in the exampleabove) to model things like curtains, rice paper, or such effects. In “thin walled” mode itsimply allows the shading of the reverse side of the object to “bleed through”.The shader also operates in “Solid” mode, but the implementation of translucency in themia material is a simplification concerned solely with the transport of light from the back ofan object to it’s front faces and is not “true” SSS (sub surface scattering). An “SSS-like” effectcan be generated by using glossy transparency coupled with translucency but it is neither asfast nor as powerful as the dedicated SSS shaders.
2.5 Detailed Description of Material Parameters 27Solid translucency w. refr trans w of 0.0 (left), 0.5 (center) and 1.0 (right)2.5.5 AnisotropyAnisotropic reflections and refractions can be created using the anisotropy parameter. Theparameter sets the ratio between the “width” and the “height” of the highlights, hence whenanisotropyis 1.0 there is no anisotropy, i.e. the effect is disabled.For other values of anisotropy (above and below 1.0 are both valid) the “shape” of thehighlight (as well as the appearance of reflections) change.anisotropy values of 1.0 (left), 4.0 (center) and 8.0 (right)The anisotropy can be rotated by using the anisotropy rotation parameter. The value 0.0is un-rotated, and the value 1.0 is one full revolution (i.e. 360 degrees). This is to aid using a
Page 1 and 2: mental ray Architectural and Design
Page 3 and 4: Table of Contents1 Introduction 11.
Page 5: Table of Contentsix3.8.3 Examples .
Page 9 and 10: Chapter 2Architectural Material2.1
Page 11 and 12: 2.2 Fundamentals 52.2.1.1 A Note on
Page 13 and 14: 2.3 Features 7Hence, when using GI:
Page 15 and 16: 2.3 Features 9The rules are as foll
Page 17 and 18: 2.3 Features 11In the real world
Page 19 and 20: 2.3 Features 13Used alone, an AO sh
Page 21 and 22: 2.3 Features 152.3.7 Performance Fe
Page 23 and 24: 2.4 Quick Guide to the Material Par
Page 25 and 26: 2.5 Detailed Description of Materia
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Page 55 and 56: 2.6 Tips and Tricks 49• For extre
Page 57 and 58: 2.6 Tips and Tricks 51Diagram for g
Page 59 and 60: 2.6 Tips and Tricks 53There is one
Page 61 and 62: 2.6 Tips and Tricks 55• Glass-Liq
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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3.9 Photometric Lights 833.9 Photom
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3.9 Photometric Lights 85• When i
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88 4 Camera- and Exposure EffectsAl
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90 4 Camera- and Exposure Effects4.
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92 4 Camera- and Exposure Effects1,
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Chapter 5General Utility Shaders5.1
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5.2 Environment Blur 105replaced by
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5.2 Environment Blur 107But what is
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5.2 Environment Blur 109Glossiness
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5.3 Light Surface 111An example of
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5.3 Light Surface 113the other two
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5.3 Light Surface 115Complex geomet
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5.3 Light Surface 117Another exampl
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