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110 5 General Utility ShadersKeep in mind that other objects will still reflect in the traditional manner with multiplesamples, and this feature only applies to environment lookups. Therefore it can be veryadvantageous to use refl falloff dist to limit “actual” reflections to nearby objects only, andlet the environment take over for distant objects 3 :No refl falloff distrefl falloff dist usedIn the right image the legs of the horse only reflect very near to the floor, and conversely thehorse only reflects the very nearest parts of the floor - the rest is environment reflections. Thisyields a faster result than actually tracing those reflections, and cuts down on the noise in theimage.5.3 Light Surface5.3.1 Shader Functionality and ParametersThe mia light surface shader is primarily intended to help creating physically plausible rendersof the “visible” portion of a light source - the actual tube in a fluorescent tube, the actualbulb in a light bulb, etc. while still using a traditional CG “light” to create the illuminationof the scene (see the use cases described below).3 This is particularly true in a visual effects context.
5.3 Light Surface 111An example of using mia light surfaceIn the image above, actual illumination comes from a long thin rectangular area light, whichis set not to cause any specular highlights. The visible “glow” of the fluorescent tube is setbe visible in reflections (and hence become our much more accurate “highlight”) but still beinvisible to FG rays, so it will not be incorrectly picked up as additional light.The mia light surface shader can either provide a color all by itself, or derive the color froman existing (set of) light(s) in the scene.The shader only returns a color and does not do any other shading per se. A tip is to use itplugged into the additional color of mia material.These are the parameters of the mia light surface shader:declare shader "mia_light_surface" (color "color" default 1 1 1,scalar "intensity" default 1.0,scalar "fg_contrib" default 0.0,scalar "refl_contrib" default 0.0,boolean "use_lights",scalar "lights_multiplier" default 1.0,vector "lights_eval_point" default 0.0 0.0 0.0,array light "lights")version 3apply textureend declare
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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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