mental ray Architectural and Design Visualization Shader Library

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104 5 General Utility Shadersdeclare shader vector "mia_roundcorners" (scalar "radius",boolean "allow_different_materials",shader "bump",integer "bump_mode",vector "bump_vector",)version 3apply textureend declareThe radius parameter defines the radius of the rounding effect, in world space units.When allow different materials is off, the rounding effect happens only against faces withthe same material. If it is on the rounding effect happens against any face of any material.The bump parameter is a passthrough to any other bump shader that handles additionalbumping of the surface, for example mib bump map2 or similar. This parameter is onlyused if bump mode is 0.To better support OEM integration, the new parameters bump mode and bump vectorwas introduced.bump mode defines the coordinate space of the bump vector, as well as that of the returnvalue of the shader itself (which is also a vector), and if it is interpreted as a “normal vectorperturbation” or a whole new “normal vector”‘.The following values are legal:• 0: compatible mode. The old bump parameter is used in place of bump vector. Thereturn value is 0,0,0, and the shader actually perturbs the normal vector itself.• 1: “add” mode in “internal” space• 2: “add” mode in world space• 3: “add” mode in object space• 4: “add” mode in camera space• 5: “set” mode in “internal” space• 6: “set” mode in world space• 7: “set” mode in object space• 8: “set” mode in camera spaceThe “add” modes mean that the vector contains a normal perturbation, i.e. a modificationthat is “added” to the current normal. The “set” mode means that the actual normal is
5.2 Environment Blur 105replaced by the incoming vector, interpreted in the aforementioned coordinate space. Equallyfor output, an “add” mode implies that the shader returns a perturbation vector intended tobe added to the current normal, and “set” mode implies that it returns a whole normal vector.In neither case does the shader actually modify the current normal by itself.5.2 Environment Blur5.2.1 Shader Functionality and ParametersThe mia envblur shader works by accepting some other environment shader as input, whichwould usually be a shader that performs an environment lookup in an HDRI environmentmap. When the render starts, it performs a one-time setup and rasterizes the result of thisenvironment shader in a special format into an internal pyramidal filter structure.Then, when rendering proceeds, the shader can perform an extremely efficient blurringoperation in this environment map in way that looks very similar to shooting an extremelylarge amount of glossy reflection rays into it; i.e. it yields a perfectly smooth result - quickly.declare shader "mia_envblur" (shader "environment",scalar "blur" default 0.0,boolean "mia_material_blur" default on,integer "resolution" default 200)version 1apply environment, textureend declareenvironment is the actual environment shader looked up by this shader.specified, the global camera environment is used.If this is notblur is the amount of blur (range 0.0 to 1.0) applied on the image. If this is 0.0, the internalbitmap is bypassed and the environment shader is looked up directly, as if the mia envblurshader was not there.The blur amount can be automatically calculated setting mia material blur to on. Anyreflective environment lookup performed by mia material will cause the appropriate blur inmia envblur. Leave blur at 0.0 in this case. This feature is described in more detail on page108.resolution is the resolution of the internal pyramidal data structure used for the filtering.The default value of 200 means that a map of 200 x 200 samples are taken and stored,for subsequent filtering. This should be set high enough to resolve the smallest feature inthe environment map. 200 is generally enough for any still image - animations need higherresolutions (1000).
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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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2.6 Tips and Tricks 51Diagram for g
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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 73 and 74: 3.6 Sky Parameters 67light"sun",# T
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mental ray Architectural and Design Visualization Shader Library

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