mental ray Architectural and Design Visualization Shader Library

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116 5 General Utility ShadersThe leftmost sphere uses mia light surface with a manual setting, i.e. use lights is off. Theuser is responsible for making sure the intensity and color of the surface is “correct”, as wellas manually keeping it in sync with any animated intensity changes etc.The center sphere uses use lights, but we get a very strange effect from it; half our lightbulbis dark. This is because the IES profile we chose only emits light in the down direction. Sincethe light source is in the center of the sphere, only the lower half of the sphere will gather anyintensity values off the light!Clearly this is not desirable; the IES profile is a compound effect applying to the entireluminaire, and should not be “painted” onto the light bulb itself!The solution is to use lights eval point as is done on the rightmost sphere. Here a point justin front of the light is picked (in the lights own coordinate space) as the “evaluation point”.Each point on the sphere (regardless of its location) will have the intensity “measured” at thatpoint in space.This gives the sphere a color that automatically follows any intensity- and color-changes ofthe light, yet is uniform across the surface of the sphere. This sphere will reflect correctly ina more plausible way than a traditional “highlight” would.In conclusion: The mia light surface shader allows...• ...creating a surface as a “stand in” for an existing light, that “looks” bright, withoutemitting additional light into the scene.• ...controlling the amount of reflection and light actually introduced into the scene.• ...driving the appearance of the surface from an existing light source.• ...more physically correct “highlights” by replacing them with glossy reflections of actualhigh-intensity objects.
5.3 Light Surface 117Another example using mia light surface
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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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2.6 Tips and Tricks 57Enjoy the tro
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2.6 Tips and Tricks 59Many small ad
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Chapter 3Sun and Sky3.1 Introductio
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3.4 Common Parameters 633.3 Importa
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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 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
Page 117 and 118: 5.3 Light Surface 111An example of
Page 119 and 120: 5.3 Light Surface 113the other two
Page 121: 5.3 Light Surface 115Complex geomet
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mental ray Architectural and Design Visualization Shader Library

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