mental ray Architectural and Design Visualization Shader Library

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98 4 Camera- and Exposure EffectsEvening shot with adjusted white-pointThe remaining issue is the overexposure around the lamp (although it would be there in a realphotograph), so we make the final image with burn highlights set to a very low value, yetkeep it nonzero to maintain a little bit of “punch”:burn highlights = 0.01In conclusion: Photography-related parameters help users with experience in photographymake good judgements on suitable values. The intuitive “look” parameters allow furtheradjustment of the image for a visually pleasing result.
4.2 Depth of Field / Bokeh 994.2 Depth of Field / Bokeh“Bokeh” is a Japanese term meaning “blur”, that is often used to refer to the perceived “look”of out-of-focus regions in a photograph. The term “Depth of Field” (henceforth abbreviatedDOF) does in actuality not describe the blur itself, but the “depth” of the region that is infocus. However, it is common parlance to talk about “DOF” while refering to the blur itself.This shader is very similar to the physical lens dof in the physics library, but with morecontrol on the actual appearance and quality of the blur.declare shader "mia_lens_bokeh" (boolean "on"default on,scalar "plane" default 100.0,scalar "radius" default 1.0,integer "samples" default 4,scalar "bias" default 1.0,integer "blade_count" default 0,scalar "blade_angle" default 0,boolean "use_bokeh" default off,color texture "bokeh")version 4apply lensscanline offend declareon enables the shader.plane is the distance to the focal plane from the camera, i.e. a point at this distance fromthe camera is completely in focus.Focal point near cameraFocal point far awayradius is the radius of confusion. This is an actual measurement in scene units, and for areal-world camera this is approximately the radius of the iris, i.e. it depends on the camerasf-stop. But it is a good rule of thumb to keep it on the order of a couple of centimeters in size(expressed in the current scene units), otherwise the scene may come out unrealistic and beperceived as a minature 5 .5 The diameter of the iris is the focal length of the lens (in scene units) divided by the f-number. Since thisparameter is a radius (not a diameter) it is half of that, i.e. (focal length / f number) / 2.
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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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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
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
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Page 96 and 97: 90 4 Camera- and Exposure Effects4.
Page 98 and 99: 92 4 Camera- and Exposure Effects1,
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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
Page 117 and 118: 5.3 Light Surface 111An example of
Page 119 and 120: 5.3 Light Surface 113the other two
Page 121 and 122: 5.3 Light Surface 115Complex geomet
Page 123: 5.3 Light Surface 117Another exampl
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