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.\" RCSid "$Id$" |
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.\" RCSid "$Id" |
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.\" Print using the -ms macro package |
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.DA 1/20/99 |
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.DA 3/12/2010 |
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.LP |
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.tl """Copyright \(co 2004 Regents, University of California |
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.tl """Copyright \(co 2010 Regents, University of California |
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.sp 2 |
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.TL |
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The |
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.br |
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Synthetic Imaging System |
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.AU |
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Building Technologies Program |
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Building Technologies Department |
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.br |
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Lawrence Berkeley Laboratory |
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.br |
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.LP |
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.UL Mirror |
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.PP |
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Mirror is used for planar surfaces that produce secondary |
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Mirror is used for planar surfaces that produce virtual |
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source reflections. |
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This material should be used sparingly, as it may cause the light |
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source calculation to blow up if it is applied to many small surfaces. |
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.UL Prism1 |
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.PP |
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The prism1 material is for general light redirection from prismatic |
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glazings, generating secondary light sources. |
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glazings, generating virtual light sources. |
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It can only be used to modify a planar surface (i.e., a polygon or disk) |
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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 |
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to work properly with secondary light sources. |
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to work properly with virtual light sources. |
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The arguments give the coefficient for the redirected light |
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and its direction. |
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.DS |
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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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.DS |
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P(theta) = (1 - g*g) / (1 + g*g - 2*g*cos(theta))^1.5 |
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.DE |
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Vname is the coefficient defined in funcfile that determines the influence |
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of foreground. |
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The background coefficient is always (1-vname). |
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Since the references are not resolved until runtime, the last |
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definitions of the modifier id's will be used. |
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This can result in modifier loops, which are detected by the |
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renderer. |
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.LP |
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.UL Mixdata |
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.PP |
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variables are global, a period (`.') can be given in |
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place of the file name. |
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It is also possible to give an expression instead of a straight |
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variable name in a scene file, although such expressions should |
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be kept simple if possible. |
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Also, functions (requiring parameters) |
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variable name in a scene file. |
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Functions (requiring parameters) |
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must be given as names and not as expressions. |
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.PP |
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Constant expressions are used as an optimization in function |
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.I Rview |
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is ray-tracing program for viewing a scene interactively. |
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When the user specifies a new perspective, |
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.I rvu |
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.I rview |
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quickly displays a rough |
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image on the terminal, then progressively |
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increases the resolution as the user looks on. |
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Pictures may be displayed directly under X11 using the program |
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.I ximage, |
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or converted a standard image format. |
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.I Ra_avs |
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converts to and from AVS image format. |
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.I Ra_pict |
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converts to Macintosh 32-bit PICT2 format. |
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.I Ra_bmp |
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converts to and from Microsoft Bitmap images. |
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.I Ra_ppm |
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converts to and from Poskanzer Portable Pixmap formats. |
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.I Ra_pr |
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converts to and from Sun 8-bit rasterfile format. |
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.I Ra_pr24 |
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converts to and from Sun 24-bit rasterfile format. |
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.I Ra_ps |
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converts to PostScript color and greyscale formats. |
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.I Ra_rgbe |
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.DS |
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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 - 2008 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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in Lausanne, Switzerland. |
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.NH 1 |
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References |
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.LP |
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Cater, K., A. Chalmers, G. Ward, |
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``Detail to Attention: Exploiting Visual Tasks for Selective Rendering,'' |
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.I "Eurograhics Symposium on Rendering", |
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June 2003. |
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.LP |
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Ward, G., Elena Eydelberg-Vileshin, |
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``Picture Perfect RGB Rendering Using Spectral Prefiltering and |
