mental ray Architectural and Design Visualization Shader Library

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52 2 Architectural MaterialGlass with color changes within the mediumThe above result is clearly much more satisfactory; the thick glass block is much deeper bluethan the thin one, and the hollow sphere now looks correct. In diagram form it looks asfollows:d=refr falloff dist where attenuation is refr falloff colorThe ray enters the medium and during it’s entire travel it is attenuated. The strength of theattenuation is such that precisely at the refr falloff dist (d in the figure) the attenuationwill match that of refr falloff color (i.e. at this depth the attenuation is the same as wasreceived immediately at the surface with the previous model). The falloff is exponential suchthat at double refr falloff dist the effect is that of refr falloff color squared, and so on.
2.6 Tips and Tricks 53There is one minor trade off:To correctly render the shadows of a material using this method one must either use causticsor make sure mental ray is rendering shadows in “segment” shadow mode.Using caustics naturally gives the most correct looking shadows (the above image was notrendered with caustics), but will require that one has caustic photons enabled and a physicallight source that shoots caustic photons.On the other hand, the mental ray “segment” shadows have a slightly lower performance thanthe more widely used “simple” shadow mode. But if it is not used, there shadow intensity willnot take the attenuation through the media into account properly 15 .2.6.2.6 Water and LiquidsWater, like glass, is a dielectric with the IOR of 1.33. Hence, the same principles as for glass(above) applies for solid bodies of water which truly need to refract things... for examplewater running out of a tap. Colored beverages use the same principles as colored glass, etc.Water into WineTo create a beverage in a container as in the image above, it is important to understand howthe mia material handles refraction through multiple surfaces vs. how the “real world” tacklesthe same issue.What is important for refraction is how the transition from one medium to another with adifferent IOR. Such a transition is known as an interface.15 But it could potentially still look “nice”.
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mental ray Architectural and Design
Page 3 and 4:
Table of Contents1 Introduction 11.
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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
Page 55 and 56: 2.6 Tips and Tricks 49• For extre
Page 57: 2.6 Tips and Tricks 51Diagram for g
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
Page 77 and 78: 3.8 Sky- and Environment Portals 71
Page 89 and 90: 3.9 Photometric Lights 833.9 Photom
Page 91: 3.9 Photometric Lights 85• When i
Page 94 and 95: 88 4 Camera- and Exposure EffectsAl
Page 96 and 97: 90 4 Camera- and Exposure Effects4.
Page 98 and 99: 92 4 Camera- and Exposure Effects1,
Page 100 and 101: 94 4 Camera- and Exposure EffectsTh
Page 102 and 103: 96 4 Camera- and Exposure Effectscr
Page 104 and 105: 98 4 Camera- and Exposure EffectsEv
Page 106 and 107: 100 4 Camera- and Exposure EffectsS
Page 109 and 110:
Chapter 5General Utility Shaders5.1
Page 111 and 112:
5.2 Environment Blur 105replaced by
Page 113 and 114:
5.2 Environment Blur 107But what is
Page 115 and 116:
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
Page 121 and 122:
5.3 Light Surface 115Complex geomet
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5.3 Light Surface 117Another exampl
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