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<title> |
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The RADIANCE 3.7 Synthetic Imaging System |
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The RADIANCE 4.1 Synthetic Imaging System |
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</title> |
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</head> |
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<body> |
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<p> |
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<h1> |
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The RADIANCE 3.7 Synthetic Imaging System |
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The RADIANCE 4.1 Synthetic Imaging System |
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</h1> |
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<p> |
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</a> |
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<dd> |
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Mirror is used for planar surfaces that produce secondary source reflections. |
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Mirror is used for planar surfaces that produce virtual source reflections. |
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This material should be used sparingly, as it may cause the light source calculation to blow up if it is applied to many small surfaces. |
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This material is only supported for flat surfaces such as <a HREF="#Polygon">polygons</a> and <a HREF="#Ring">rings</a>. |
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The arguments are simply the RGB reflectance values, which should be between 0 and 1. |
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</a> |
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<dd> |
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The prism1 material is for general light redirection from prismatic glazings, generating secondary light sources. |
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The prism1 material is for general light redirection from prismatic glazings, generating virtual light sources. |
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It can only be used to modify a planar surface |
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(i.e., a <a HREF="#Polygon">polygon</a> or <a HREF="#Ring">disk</a>) |
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and should not result in either light concentration or scattering. |
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The new direction of the ray can be on either side of the material, |
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and the definitions must have the correct bidirectional properties to work properly with secondary light sources. |
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and the definitions must have the correct bidirectional properties to work properly with virtual light sources. |
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The arguments give the coefficient for the redirected light and its direction. |
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<pre> |
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The scattering eccentricity parameter will likewise override the global |
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setting if it is present. |
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Scattering eccentricity indicates how much scattered light favors the |
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forward direction, as fit by the Heyney-Greenstein function: |
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forward direction, as fit by the Henyey-Greenstein function: |
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<pre> |
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P(theta) = (1 - g*g) / (1 + g*g - 2*g*cos(theta))^1.5 |
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<p> |
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<dt> |
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<a NAME="BSDF"> |
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<b>BSDF</b> |
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</a> |
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<dd> |
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The BSDF material type loads an XML (eXtensible Markup Language) |
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file describing a bidirectional scattering distribution function. |
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Real arguments to this material may define additional |
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diffuse components that augment the BSDF data. |
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String arguments are used to define thickness for proxied |
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surfaces and the "up" orientation for the material. |
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<pre> |
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mod BSDF id |
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6+ thick BSDFfile ux uy uz funcfile transform |
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0 |
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0|3|6|9 |
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rfdif gfdif bfdif |
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rbdif gbdif bbdif |
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rtdif gtdif btdif |
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</pre> |
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|
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<p> |
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The first string argument is a "thickness" parameter that may be used |
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to hide detail geometry being proxied by an aggregate BSDF material. |
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If a view or shadow ray hits a BSDF proxy with non-zero thickness, |
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it will pass directly through as if the surface were not there. |
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Similar to the illum type, this permits direct viewing and |
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shadow testing of complex geometry. |
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The BSDF is used when a scattered (indirect) ray hits the surface, |
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and any transmitted sample rays will be offset by the thickness amount |
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to avoid the hidden geometry and gather samples from the other side. |
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In this manner, BSDF surfaces can improve the results for indirect |
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scattering from complex systems without sacrificing appearance or |
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shadow accuracy. |
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If the BSDF has transmission and back-side reflection data, |
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a parallel BSDF surface may be |
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placed slightly less than the given thickness away from the front surface |
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to enclose the complex geometry on both sides. |
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The sign of the thickness is important, as it indicates |
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whether the proxied geometry is behind the BSDF |
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surface (when thickness is positive) or in front (when |
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thickness is negative). |
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<p> |
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The second string argument is the name of the BSDF file, |
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which is found in the usual auxiliary locations. The |
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following three string parameters name variables for an |
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"up" vector, which together with the surface |
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normal, define the local coordinate system that orients the |
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BSDF. These variables, along with the thickness, are defined |
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in a function file given as the next string argument. An |
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optional transform is used to scale the thickness and |
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reorient the up vector. |
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<p> |
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If no real arguments are given, the BSDF is used by itself |
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to determine reflection and transmission. If there are at |
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least 3 real arguments, the first triplet is an additional |
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diffuse reflectance for the front side. At least 6 real |
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arguments adds diffuse reflectance to the rear side of the |
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surface. If there are 9 real arguments, the final triplet |
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will be taken as an additional diffuse transmittance. All |
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diffuse components as well as the non-diffuse transmission |
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are modified by patterns applied to this material. The |
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non-diffuse reflection from either side are unaffected. |
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Textures perturb the effective surface normal in the usual |
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way. |
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<p> |
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The surface normal of this type is not altered to face the |
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incoming ray, so the front and back BSDF reflections may |
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differ. (Transmission is identical front-to-back by physical |
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law.) If back visibility is turned off during rendering and |
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there is no transmission or back-side reflection, only then |
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the surface will be invisible from behind. Unlike other |
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data-driven material types, the BSDF type is fully supported |
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and all parts of the distribution are properly sampled. |
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<p> |
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<dt> |
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<a NAME="Antimatter"> |
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<b>Antimatter</b> |
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</a> |
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which serves as a form of opacity control when used with a material.) |
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Vname is the coefficient defined in funcfile that determines the influence of foreground. |
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The background coefficient is always (1-vname). |
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Since the references are not resolved until run-time, the last definitions of the modifier id's will be used. |
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This can result in modifier loops, which are detected by the renderer. |
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<p> |
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|
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the required variables are global, |
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a period (`.') can be given in place of the file name. |
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It is also possible to give an expression instead |
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of a straight variable name in a scene file, |
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although such expressions should be kept |
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simple if possible. |
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Also, functions (requiring parameters) must be given |
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of a straight variable name in a scene file. |
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Functions (requiring parameters) must be given |
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as names and not as expressions. |
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|
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<p> |
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<pre> |
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The Radiance Software License, Version 1.0 |
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|
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Copyright (c) 1990 - 2002 The Regents of the University of California, |
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Copyright (c) 1990 - 2010 The Regents of the University of California, |
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through Lawrence Berkeley National Laboratory. All rights reserved. |
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|
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Redistribution and use in source and binary forms, with or without |
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nor may "Radiance" appear in their name, without prior written |
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permission of Lawrence Berkeley National Laboratory. |
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|
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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THIS SOFTWARE IS PROVIDED ``AS IS" AND ANY EXPRESSED OR IMPLIED |
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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</h2> |
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<p> |
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<ul> |
| 1899 |
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<li>Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson, |
| 1900 |
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"<a href="http://gaia.lbl.gov/btech/papers/4414.pdf">Simulating |
| 1901 |
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the Daylight Performance of Complex Fenestration Systems |
| 1902 |
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Using Bidirectional Scattering Distribution Functions within |
| 1903 |
+ |
Radiance</a>," |
| 1904 |
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<em>Journal of the Illuminating Engineering Soc. of North America</em>, |
| 1905 |
+ |
April 2011. |
| 1906 |
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<li>Cater, Kirsten, Alan Chalmers, Greg Ward, |
| 1907 |
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"<a href="http://www.anyhere.com/gward/papers/egsr2003.pdf">Detail to Attention: |
| 1908 |
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Exploiting Visual Tasks for Selective Rendering</a>," |
| 1909 |
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<em>Eurographics Symposium |
| 1910 |
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on Rendering 2003</em>, June 2003. |
| 1911 |
|
<li>Ward, Greg, Elena Eydelberg-Vileshin, |
| 1912 |
< |
``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/egwr02/index.html">Picture Perfect RGB |
| 1913 |
< |
Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>,'' |
| 1912 |
> |
"<a HREF="http://www.anyhere.com/gward/papers/egwr02/index.html">Picture Perfect RGB |
| 1913 |
> |
Rendering Using Spectral Prefiltering and Sharp Color Primaries</a>," |
| 1914 |
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Thirteenth Eurographics Workshop on Rendering (2002), |
| 1915 |
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P. Debevec and S. Gibson (Editors), June 2002. |
| 1916 |
|
<li>Ward, Gregory, |
| 1917 |
< |
``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/cic01.pdf">High Dynamic Range Imaging</a>,'' |
| 1917 |
> |
"<a HREF="http://www.anyhere.com/gward/papers/cic01.pdf">High Dynamic Range Imaging</a>," |
| 1918 |
|
Proceedings of the Ninth Color Imaging Conference, November 2001. |
| 1919 |
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<li>Ward, Gregory and Maryann Simmons, |
| 1920 |
< |
``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/tog99.pdf"> |
| 1920 |
> |
"<a HREF="http://www.anyhere.com/gward/papers/tog99.pdf"> |
| 1921 |
|
The Holodeck Ray Cache: An Interactive Rendering System for Global Illumination in Nondiffuse |
| 1922 |
< |
Environments</a>,'' ACM Transactions on Graphics, 18(4):361-98, October 1999. |
| 1923 |
< |
<li>Larson, G.W., ``<a HREF="http://viz.cs.berkeley.edu/~gwlarson/papers/ewp98.pdf">The Holodeck: A Parallel |
| 1924 |
< |
Ray-caching Rendering System</a>,'' Proceedings of the Second |
| 1922 |
> |
Environments</a>," ACM Transactions on Graphics, 18(4):361-98, October 1999. |
| 1923 |
> |
<li>Larson, G.W., "<a HREF="http://www.anyhere.com/gward/papers/ewp98.pdf">The Holodeck: A Parallel |
| 1924 |
> |
Ray-caching Rendering System</a>," Proceedings of the Second |
| 1925 |
|
Eurographics Workshop on Parallel Graphics and Visualisation, |
| 1926 |
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September 1998. |
| 1927 |
|
<li>Larson, G.W. and R.A. Shakespeare, |
| 1929 |
|
the Art and Science of Lighting Visualization</em></a>, |
| 1930 |
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Morgan Kaufmann Publishers, 1998. |
| 1931 |
|
<li>Larson, G.W., H. Rushmeier, C. Piatko, |
| 1932 |
< |
``<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility |
| 1932 |
> |
"<a HREF="http://radsite.lbl.gov/radiance/papers/lbnl39882/tonemap.pdf">A Visibility |
| 1933 |
|
Matching Tone Reproduction Operator for |
| 1934 |
< |
High Dynamic Range Scenes</a>,'' LBNL Technical Report 39882, |
| 1934 |
> |
High Dynamic Range Scenes</a>," LBNL Technical Report 39882, |
| 1935 |
|
January 1997. |
| 1936 |
< |
<li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making |
| 1937 |
< |
Global Illumination User-Friendly</a>,'' Sixth |
| 1936 |
> |
<li>Ward, G., "<a HREF="http://radsite.lbl.gov/radiance/papers/erw95.1/paper.html">Making |
| 1937 |
> |
Global Illumination User-Friendly</a>," Sixth |
| 1938 |
|
Eurographics Workshop on Rendering, Springer-Verlag, |
| 1939 |
|
Dublin, Ireland, June 1995.</li> |
| 1940 |
|
<li>Rushmeier, H., G. Ward, C. Piatko, P. Sanders, B. Rust, |
| 1941 |
< |
``<a HREF="http://radsite.lbl.gov/mgf/compare.html"> |
| 1941 |
> |
"<a HREF="http://radsite.lbl.gov/mgf/compare.html"> |
| 1942 |
|
Comparing Real and Synthetic Images: Some Ideas about |
| 1943 |
< |
Metrics</a>,'' Sixth Eurographics Workshop on Rendering, |
| 1943 |
> |
Metrics</a>," Sixth Eurographics Workshop on Rendering, |
| 1944 |
|
Springer-Verlag, Dublin, Ireland, June 1995.</li> |
| 1945 |
< |
<li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE |
| 1946 |
< |
Lighting Simulation and Rendering System</a>,'' <em>Computer |
| 1945 |
> |
<li>Ward, G., "<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.1/paper.html">The RADIANCE |
| 1946 |
> |
Lighting Simulation and Rendering System</a>," <em>Computer |
| 1947 |
|
Graphics</em>, July 1994.</li> |
| 1948 |
< |
<li>Rushmeier, H., G. Ward, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy |
| 1949 |
< |
Preserving Non-Linear Filters</a>,'' <em>Computer |
| 1948 |
> |
<li>Rushmeier, H., G. Ward, "<a HREF="http://radsite.lbl.gov/radiance/papers/sg94.2/energy.html">Energy |
| 1949 |
> |
Preserving Non-Linear Filters</a>," <em>Computer |
| 1950 |
|
Graphics</em>, July 1994.</li> |
| 1951 |
< |
<li>Ward, G., ``A Contrast-Based Scalefactor for Luminance |
| 1952 |
< |
Display,'' <em>Graphics Gems IV</em>, Edited by Paul Heckbert, |
| 1951 |
> |
<li>Ward, G., "A Contrast-Based Scalefactor for Luminance |
| 1952 |
> |
Display," <em>Graphics Gems IV</em>, Edited by Paul Heckbert, |
| 1953 |
|
Academic Press 1994.</li> |
| 1954 |
< |
<li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and |
| 1955 |
< |
Modeling Anisotropic Reflection</a>,'' <em>Computer |
| 1954 |
> |
<li>Ward, G., "<a HREF="http://radsite.lbl.gov/radiance/papers/sg92/paper.html">Measuring and |
| 1955 |
> |
Modeling Anisotropic Reflection</a>," <em>Computer |
| 1956 |
|
Graphics</em>, Vol. 26, No. 2, July 1992. </li> |
| 1957 |
< |
<li>Ward, G., P. Heckbert, ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance |
| 1958 |
< |
Gradients</a>,'' Third Annual Eurographics Workshop on |
| 1957 |
> |
<li>Ward, G., P. Heckbert, "<a HREF="http://radsite.lbl.gov/radiance/papers/erw92/paper.html">Irradiance |
| 1958 |
> |
Gradients</a>," Third Annual Eurographics Workshop on |
| 1959 |
|
Rendering, Springer-Verlag, May 1992. </li> |
| 1960 |
< |
<li>Ward, G., ``<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow |
| 1961 |
< |
Testing for Ray Tracing</a>'' Photorealistic Rendering in |
| 1960 |
> |
<li>Ward, G., "<a HREF="http://radsite.lbl.gov/radiance/papers/erw91/erw91.html">Adaptive Shadow |
| 1961 |
> |
Testing for Ray Tracing</a>" Photorealistic Rendering in |
| 1962 |
|
Computer Graphics, proceedings of 1991 Eurographics |
| 1963 |
|
Rendering Workshop, edited by P. Brunet and F.W. Jansen, |
| 1964 |
|
Springer-Verlag. </li> |
| 1965 |
< |
<li>Ward, G., ``Visualization,'' <em>Lighting Design and |
| 1965 |
> |
<li>Ward, G., "Visualization," <em>Lighting Design and |
| 1966 |
|
Application</em>, Vol. 20, No. 6, June 1990. </li> |
| 1967 |
< |
<li>Ward, G., F. Rubinstein, R. Clear, ``<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for |
| 1968 |
< |
Diffuse Interreflection</a>,'' <em>Computer Graphics</em>, |
| 1967 |
> |
<li>Ward, G., F. Rubinstein, R. Clear, "<a HREF="http://radsite.lbl.gov/radiance/papers/sg88/paper.html">A Ray Tracing Solution for |
| 1968 |
> |
Diffuse Interreflection</a>," <em>Computer Graphics</em>, |
| 1969 |
|
Vol. 22, No. 4, August 1988. </li> |
| 1970 |
< |
<li>Ward, G., F. Rubinstein, ``A New Technique for Computer |
| 1971 |
< |
Simulation of Illuminated Spaces,'' <em>Journal of the |
| 1970 |
> |
<li>Ward, G., F. Rubinstein, "A New Technique for Computer |
| 1971 |
> |
Simulation of Illuminated Spaces," <em>Journal of the |
| 1972 |
|
Illuminating Engineering Society</em>, Vol. 17, No. 1, |
| 1973 |
|
Winter 1988. </li> |
| 1974 |
|
</ul> |
| 2006 |
|
<a HREF="#Plasdata">Plasdata</a> |
| 2007 |
|
<a HREF="#Metdata">Metdata</a> |
| 2008 |
|
<a HREF="#Transdata">Transdata</a> |
| 2009 |
+ |
<a HREF="#BSDF">BSDF</a> |
| 2010 |
|
<a HREF="#Antimatter">Antimatter</a> |
| 2011 |
|
|
| 2012 |
|
</pre> |
