mental ray Architectural and Design Visualization Shader Library

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78 3 Sun and SkyFG with 250 rays and density 0.8 FG with 500 rays and density 1.5Yes, increasing the number of rays and the density helps but it hurts our render time a lot.Even at the high setting we are still not near the optimal result. We would have to go evenhigher to resolve all the detail!Lets back down from the high FG settings for a moment and concentrate on light transport.The scene is still very dark, because we are only getting a single FG bounce, and since thelighting from the sky is indirect we get no bounce of that light! Meaning: In this scene, thesunlight is bouncing once, but the skylight is not bouncing at all!Lets turn up the number of bounces to 3:FG with 3 bouncesThis gave us more light. Due to the fact we stepped back from our “high” FG settings, thelighting isn’t smooth and lacks any detail.Using FG multi-bounce is just one of the ways mental ray can transport light in a scene. Thealternative is to use Photons (GI). But keep in mind that when Photons are enabled, FG goesback to a single bounce, letting photons handle all the remaining bounces:
3.8 Sky- and Environment Portals 79FG with GI (Photons)Now something odd happened; the color shifted towards yellow. Why is that? This is becausethe sky does not generate any photons. So we now have multiple good-quality bounces of thesun, but we are back to zero bounces of the sky!3.8.3.2 With Portal LightsNow lets turn to the portal lights. First lets turn all FG and GI off, and simply add a portallight to the window with it’s default settings. The resulting image is this:The portal light only, no FG or PhotonsColor wise this looks similar to the early FG results above, but the level of detail is muchhigher. Since no interpolation is going on, the shelves sit securely on the walls. All shadowscontain the subtlest of details.
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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 33 and 34: 2.5 Detailed Description of Materia
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 83: 3.8 Sky- and Environment Portals 77
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
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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mental ray Architectural and Design Visualization Shader Library

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