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Revision 1.1 by greg, Tue Mar 11 19:20:20 2003 UTC vs.
Revision 1.47 by greg, Mon Dec 9 19:21:38 2024 UTC

# Line 1 | Line 1
1 < .\" RCSid "$Id"
1 > .\" RCSid "$Id$"
2   .\" Print using the -ms macro package
3 < .DA 1/20/99
3 > .DA 12/09/2024
4   .LP
5 < .tl """Copyright \(co 1996 Regents, University of California
5 > .tl """Copyright \(co 2024 Regents, University of California
6   .sp 2
7   .TL
8   The
# Line 10 | Line 10 | The
10   .br
11   Synthetic Imaging System
12   .AU
13 < Greg Ward
13 > Building Technologies Department
14   .br
15   Lawrence Berkeley Laboratory
16   .br
17 < 1 Cyclotron Rd.
17 > 1 Cyclotron Rd., MS 90-3111
18   .br
19   Berkeley, CA  94720
20 – .br
21 – (510) 486-4757
20   .NH 1
21   Introduction
22   .PP
# Line 49 | Line 47 | which produces a picture from a scene description.
47   is a variation of
48   .I rpict
49   that computes and displays images interactively.
50 + Other programs (not shown) connect many of these elements together,
51 + such as the executive programs
52 + .I rad
53 + and
54 + .I ranimate,
55 + the interactive rendering program
56 + .I rholo,
57 + and the animation program
58 + .I ranimove.
59 + The program
60 + .I obj2mesh
61 + acts as both a converter and scene compiler, converting a Wavefront .OBJ
62 + file into a compiled mesh octree for efficient rendering.
63   .PP
64   A scene description file lists the surfaces and materials
65 < that make up a specific environment.
66 < The current surface types are spheres, polygons, cones,
67 < and cylinders.
68 < They can be made from materials such as plastic, metal,
69 < and glass.
70 < Light sources can be distant disks as well as local spheres, discs and
71 < polygons.
65 > that  make up a specific environment.  
66 > The current surface types are  spheres,  polygons,  cones,  and  cylinders.
67 > There is also a composite surface type, called mesh, and a pseudosurface
68 > type, called instance, which facilitates very complex geometries.
69 > Surfaces can be made from materials such as plastic, metal, and glass.  
70 > Light sources can be distant disks as well as  local spheres, disks
71 > and polygons.
72   .PP
73   From a three-dimensional scene description and a specified view,
74   .I rpict
# Line 84 | Line 95 | It is stored as ASCII text, with the following basic f
95   # comment
96  
97   modifier type identifier
98 < n S1 S2 S3 .. Sn
98 > n S1 S2 "S 3" .. Sn
99   0
100   m R1 R2 R3 .. Rm
101  
# Line 112 | Line 123 | primitives.
123   Thus, the same identifier may be used repeatedly, and each new
124   definition will apply to the primitives following it.
125   .FE
126 < An identifier can be any string (i.e. sequence of non-blank
116 < characters).
126 > An identifier can be any string (i.e., any sequence of non-white characters).
127   The
128   .I arguments
129   associated with a primitive can be strings or real numbers.
130   The first integer following the identifier is the number
131   of string arguments, and it is followed by the arguments themselves
132 < (separated by white space).
132 > (separated by white space or enclosed in quotes).
133   The next integer is the number of integer arguments, and is followed
134   by the integer arguments.
135   (There are currently no primitives that use them, however.)
# Line 129 | Line 139 | by the real arguments.
139   An alias gets its type and arguments from a previously defined primitive.
140   This is useful when the same material is used with a different
141   modifier, or as a convenient naming mechanism.
142 + The reserved modifier name "inherit" may be used to specificy that
143 + an alias will inherit its modifier from the original.
144   Surfaces cannot be aliased.
145   .PP
146   A line beginning with an exclamation point, `!',
# Line 140 | Line 152 | confusion will result.
152   A command may be continued over multiple lines using a backslash, `\\',
153   to escape the newline.
154   .PP
155 < Blank space is generally ignored, except as a separator.
155 > White space is generally ignored, except as a separator.
156   The exception is the newline character after a command or comment.
157   Commands, comments and primitives may appear in any combination, so long
158   as they are not intermingled.
# Line 148 | Line 160 | as they are not intermingled.
160   Primitive Types
161   .PP
162   Primitives can be surfaces, materials, textures or patterns.
163 < Modifiers can be materials, textures or patterns.
163 > Modifiers can be materials, mixtures, textures or patterns.
164   Simple surfaces must have one material in their modifier list.
165   .NH 3
166   Surfaces
# Line 221 | Line 233 | mod cone id
233   .LP
234   .UL Cup
235   .PP
236 < A cup is an inverted cone (i.e. has an inward surface normal).
236 > A cup is an inverted cone (i.e., has an inward surface normal).
237   .LP
238   .UL Cylinder
239   .PP
# Line 260 | Line 272 | mod ring id
272   A mesh is a compound surface, made up of many triangles and
273   an octree data structure to accelerate ray intersection.
274   It is typically converted from a Wavefront .OBJ file using the
275 < obj2mesh program.
275 > .I obj2mesh
276 > program.
277   .DS
278   mod mesh id
279   1+ meshfile transform
280   0
281   0
282   .DE
283 + If the modifier is "void", then surfaces will use the modifiers given
284 + in the original mesh description.
285 + Otherwise, the modifier specified is used in their place.
286   The transform moves the mesh to the desired location in the scene.
287   Multiple instances using the same meshfile take little extra memory,
288   and the compiled mesh itself takes much less space than individual
# Line 278 | Line 294 | permitting very detailed geometries that would otherwi
294   available memory.
295   In addition, the mesh primitive can have associated (u,v) coordinates
296   for pattern and texture mapping.
297 < These are made available to function files via the Lu and Lu variables.
297 > These are made available to function files via the Lu and Lv variables.
298   .LP
299   .UL Instance
300   .PP
# Line 316 | Line 332 | The basic types are given below.
332   .LP
333   .UL Light
334   .PP
335 < Light is the basic material for self-luminous surfaces (i.e. light
335 > Light is the basic material for self-luminous surfaces (i.e., light
336   sources).
337   In addition to the source surface type, spheres, discs (rings with zero
338   inner radius), cylinders (provided they are long enough), and
# Line 376 | Line 392 | Spotlight is used for self-luminous surfaces having di
392   As well as radiance, the full cone angle (in degrees)
393   and orientation (output direction) vector are given.
394   The length of the orientation vector is the distance
395 < of the effective focus behind the source center (i.e. the focal length).
395 > of the effective focus behind the source center (i.e., the focal length).
396   .DS
397   mod spotlight id
398   0
# Line 386 | Line 402 | mod spotlight id
402   .LP
403   .UL Mirror
404   .PP
405 < Mirror is used for planar surfaces that produce secondary
405 > Mirror is used for planar surfaces that produce virtual
406   source reflections.
407   This material should be used sparingly, as it may cause the light
408   source calculation to blow up if it is applied to many small surfaces.
# Line 410 | Line 426 | mod mirror id
426   .UL Prism1
427   .PP
428   The prism1 material is for general light redirection from prismatic
429 < glazings, generating secondary light sources.
430 < It can only be used to modify a planar surface (i.e. a polygon or disk)
429 > glazings, generating virtual light sources.
430 > It can only be used to modify a planar surface (i.e., a polygon or disk)
431   and should not result in either light concentration or scattering.
432   The new direction of the ray can be on either side of the material,
433   and the definitions must have the correct bidirectional properties
434 < to work properly with secondary light sources.
434 > to work properly with virtual light sources.
435   The arguments give the coefficient for the redirected light
436   and its direction.
437   .DS
# Line 475 | Line 491 | a perfectly scattering medium (no absorption).
491   The scattering eccentricity parameter will likewise override the global
492   setting if it is present.
493   Scattering eccentricity indicates how much scattered light favors the
494 < forward direction, as fit by the Heyney-Greenstein function:
494 > forward direction, as fit by the Henyey-Greenstein function:
495   .DS
496   P(theta) = (1 - g*g) / (1 + g*g - 2*g*cos(theta))^1.5
497   .DE
# Line 564 | Line 580 | direction vector
580   These three expressions (separated by white space) are evaluated in
581   the context of the function file
582   .I funcfile.
583 < If no function file is required (i.e. no special variables or
583 > If no function file is required (i.e., no special variables or
584   functions are required), a period (`.') may be given in its
585   place.
586   (See the discussion of Function Files in the Auxiliary Files section).
# Line 606 | Line 622 | mod trans2 id
622   8 red green blue spec urough vrough trans tspec
623   .DE
624   .LP
625 + .UL Ashik2
626 + .PP
627 + Ashik2 is the anisotropic reflectance model by Ashikhmin & Shirley.
628 + The string arguments are the same as for plastic2, but the real
629 + arguments have additional flexibility to specify the specular color.
630 + Also, rather than roughness, specular power is used, which has no
631 + physical meaning other than larger numbers are equivalent to a smoother
632 + surface.
633 + Unlike other material types, total reflectance is the sum of
634 + diffuse and specular colors, and should be adjusted accordingly.
635 + .DS
636 + mod ashik2 id
637 + 4+ ux uy uz funcfile transform
638 + 0
639 + 8 dred dgrn dblu sred sgrn sblu u-power v-power
640 + .DE
641 + .LP
642 + .UL WGMDfunc
643 + .PP
644 + WGMDfunc is a more programmable version of trans2,
645 + with separate modifier paths and variables to control each component.
646 + (WGMD stands for Ward-Geisler-Moroder-Duer, which is the basis for
647 + this empirical model, similar to the previous ones beside Ashik2.)\0
648 + The specification of this material is given below.
649 + .DS
650 + mod WGMDfunc id
651 + 13+ rs_mod  rs  rs_urough rs_vrough
652 +    ts_mod  ts  ts_urough ts_vrough
653 +    td_mod
654 +    ux uy uz  funcfile  transform
655 + 0
656 + 9+  rfdif gfdif bfdif
657 +    rbdif gbdif bbdif
658 +    rtdif gtdif btdif
659 +    A10 ..
660 + .DE
661 + The sum of specular reflectance (
662 + .I rs
663 + ), specular transmittance (
664 + .I ts
665 + ), diffuse reflectance (
666 + .I "rfdif gfdif bfdif"
667 + for front and
668 + .I "rbdif gbdif bbdif"
669 + for back)
670 + and diffuse transmittance (
671 + .I "rtdif gtdif btdif"
672 + ) should be less than 1 for each
673 + channel.
674 + .PP
675 + Unique to this material, separate modifier channels are
676 + provided for each component.
677 + The main modifier is used on the diffuse reflectance, both
678 + front and back.
679 + The
680 + .I rs_mod
681 + modifier is used for specular reflectance.
682 + If "void" is given for
683 + .I rs_mod,
684 + then the specular reflection color will be white.
685 + The special "inherit" keyword may also be given, in which case
686 + specular reflectance will share the main modifier.
687 + This behavior is replicated for the specular transmittance modifier
688 + .I ts_mod,
689 + which has its own independent roughness expressions.
690 + Finally, the diffuse transmittance modifier is given as
691 + .I td_mod,
692 + which may also be "void" or "inherit".
693 + Note that any spectra or color for specular components must be
694 + carried by the named modifier(s).
695 + .PP
696 + The main advantage to this material over BRTDfunc and
697 + other programmable types described below is that the specular sampling is
698 + well-defined, so that all components are fully computed.
699 + .LP
700   .UL Dielectric
701   .PP
702   A dielectric material is transparent, and it refracts light
# Line 849 | Line 940 | mod transdata id
940   6+ red green blue rspec trans tspec A7 ..
941   .DE
942   .LP
943 + .UL BSDF
944 + .PP
945 + The BSDF material type loads an XML (eXtensible Markup Language)
946 + file describing a bidirectional scattering distribution function.
947 + Real arguments to this material may define additional
948 + diffuse components that augment the BSDF data.
949 + String arguments are used to define thickness for proxied
950 + surfaces and the "up" orientation for the material.
951 + .DS
952 + mod BSDF id
953 + 6+ thick BSDFfile ux uy uz funcfile transform
954 + 0
955 + 0|3|6|9
956 +     rfdif gfdif bfdif
957 +     rbdif gbdif bbdif
958 +     rtdif gtdif btdif
959 + .DE
960 + The first string argument is a "thickness" parameter that may be used
961 + to hide detail geometry being proxied by an aggregate BSDF material.
962 + If a view or shadow ray hits a BSDF proxy with non-zero thickness,
963 + it will pass directly through as if the surface were not there.
964 + Similar to the illum type, this permits direct viewing and
965 + shadow testing of complex geometry.
966 + The BSDF is used when a scattered (indirect) ray hits the surface,
967 + and any transmitted sample rays will be offset by the thickness amount
968 + to avoid the hidden geometry and gather samples from the other side.
969 + In this manner, BSDF surfaces can improve the results for indirect
970 + scattering from complex systems without sacrificing appearance or
971 + shadow accuracy.
972 + If the BSDF has transmission and back-side reflection data,
973 + a parallel BSDF surface may be
974 + placed slightly less than the given thickness away from the front surface
975 + to enclose the complex geometry on both sides.
976 + The sign of the thickness is important, as it indicates whether the
977 + proxied geometry is behind the BSDF surface (when thickness is positive)
978 + or in front (when thickness is negative).
979 + .LP
980 + The second string argument is the name of the BSDF file, which is
981 + found in the usual auxiliary locations.
982 + The following three string parameters name variables for an "up" vector,
983 + which together with the surface normal, define the
984 + local coordinate system that orients the BSDF.
985 + These variables, along with the thickness, are defined in a function
986 + file given as the next string argument.
987 + An optional transform is used to scale the thickness and reorient the up vector.
988 + .LP
989 + If no real arguments are given, the BSDF is used by itself to determine
990 + reflection and transmission.
991 + If there are at least 3 real arguments, the first triplet is an
992 + additional diffuse reflectance for the front side.
993 + At least 6 real arguments adds diffuse reflectance to the rear side of the surface.
994 + If there are 9 real arguments, the final triplet will be taken as an additional
995 + diffuse transmittance.
996 + All diffuse components as well as the non-diffuse transmission are
997 + modified by patterns applied to this material.
998 + The non-diffuse reflection from either side are unaffected.
999 + Textures perturb the effective surface normal in the usual way.
1000 + .LP
1001 + The surface normal of this type is not altered to face the incoming ray,
1002 + so the front and back BSDF reflections may differ.
1003 + (Transmission is identical front-to-back by physical law.)\0
1004 + If back visibility is turned off during rendering and there is no
1005 + transmission or back-side reflection, only then the surface will be
1006 + invisible from behind.
1007 + Unlike other data-driven material types, the BSDF type is fully
1008 + supported and all parts of the distribution are properly sampled.
1009 + .LP
1010 + .UL aBSDF
1011 + .PP
1012 + The aBSDF material is identical to the BSDF type with two important
1013 + differences.
1014 + First, proxy geometry is not supported, so there is no thickness parameter.
1015 + Second, an aBSDF is assumed to have some specular through component
1016 + (the 'a' stands for "aperture"), which
1017 + is treated specially during the direct calculation and when viewing the
1018 + material.
1019 + Based on the BSDF data, the coefficient of specular transmission is
1020 + determined and used for modifying unscattered shadow and view rays.
1021 + .DS
1022 + mod aBSDF id
1023 + 5+ BSDFfile ux uy uz funcfile transform
1024 + 0
1025 + 0|3|6|9
1026 +     rfdif gfdif bfdif
1027 +     rbdif gbdif bbdif
1028 +     rtdif gtdif btdif
1029 + .DE
1030 + .LP
1031 + If a material has no specular transmitted component, it is much better
1032 + to use the BSDF type with a zero thickness than to use aBSDF.
1033 + .LP
1034   .UL Antimatter
1035   .PP
1036   Antimatter is a material that can "subtract" volumes from other volumes.
# Line 863 | Line 1045 | N mod1 mod2 .. modN
1045   The first modifier will also be used to shade the area leaving the
1046   antimatter volume and entering the regular volume.
1047   If mod1 is void, the antimatter volume is completely invisible.
1048 < Antimatter does not work properly with the material type "trans",
1049 < and multiple antimatter surfaces should be disjoint.
1048 > If shading is desired at antimatter surfaces, it is important
1049 > that the related volumes are closed with outward-facing normals.
1050 > Antimatter surfaces should not intersect with other antimatter boundaries,
1051 > and it is unwise to use the same modifier in nested antimatter volumes.
1052   The viewpoint must be outside all volumes concerned for a correct
1053   rendering.
1054   .NH 3
# Line 1068 | Line 1252 | A section of text meant to depict a picture, perhaps u
1252   font such as hexbit4x1.fnt, calls for uniform spacing.
1253   Reasonable magnitudes for proportional spacing are
1254   between 0.1 (for tightly spaced characters) and 0.3 (for wide spacing).
1255 + .LP
1256 + .UL Spectrum
1257 + .PP
1258 + The spectrum primitive is the most basic type for introducing spectral
1259 + color to a material.
1260 + Since materials only provide RGB parameters, spectral patterns
1261 + are the only way to superimpose wavelength-dependent behavior.
1262 + .DS
1263 + mod spectrum id
1264 + 0
1265 + 0
1266 + 5+ nmA nmB s1 s2 .. sN
1267 + .DE
1268 + The first two real arguments indicate the extrema of the
1269 + spectral range in nanometers.
1270 + Subsequent real values correspond to multipliers at each wavelength.
1271 + The nmA wavelength may be greater or less than nmB,
1272 + but they may not be equal, and their ordering matches
1273 + the order of the spectral values.
1274 + A minimum of 3 values must be given, which would act
1275 + more or less the same as a constant RGB multiplier.
1276 + As with RGB values, spectral quantities normally range between 0
1277 + and 1 at each wavelength, or average to 1.0 against a standard
1278 + sensitivity functions such as V(lambda).
1279 + The best results obtain when the spectral range and number
1280 + of samples match rendering options, though resampling will handle
1281 + any differences, zero-filling wavelenths outside the nmA to nmB
1282 + range.
1283 + A warning will be issued if the given wavelength range does not
1284 + adequately cover the visible spectrum.
1285 + .LP
1286 + .UL Specfile
1287 + .PP
1288 + The specfile primitive is equivalent to the spectrum type, but
1289 + the wavelength range and values are contained in a 1-dimensional
1290 + data file.
1291 + This may be a more convenient way to specify a spectral color,
1292 + especially one corresponding to a standard illuminant such as D65
1293 + or a library of measured spectra.
1294 + .DS
1295 + mod specfile id
1296 + 1 datafile
1297 + 0
1298 + 0
1299 + .DE
1300 + As with the spectrum type, rendering wavelengths outside the defined
1301 + range will be zero-filled.
1302 + Unlike the spectrum type, the file may contain non-uniform samples.
1303 + .LP
1304 + .UL Specfunc
1305 + .PP
1306 + The specfunc primitive offers dynamic control over a spectral
1307 + pattern, similar to the colorfunc type.
1308 + .DS
1309 + mod specfunc id
1310 + 2+ sfunc funcfile transform
1311 + 0
1312 + 2+ nmA nmB A3 ..
1313 + .DE
1314 + Like the spectrum primitive, the wavelength range is specified
1315 + in the first two real arguments, and additional real values are
1316 + set in the evaluation context.
1317 + This function is fed a wavelenth sample
1318 + between nmA and nmB as its only argument,
1319 + and it returns the corresponding spectral intensity.
1320 + .LP
1321 + .UL Specdata
1322 + .PP
1323 + Specdata is like brightdata and colordata, but with more
1324 + than 3 specular samples.
1325 + .DS
1326 + mod specdata id
1327 + 3+n+
1328 +        func datafile
1329 +        funcfile x1 x2 .. xn transform
1330 + 0
1331 + m A1 A2 .. Am
1332 + .DE
1333 + The data file must have one more dimension than the coordinate
1334 + variable count, as this final dimension corresponds to the covered
1335 + spectrum.
1336 + The starting and ending wavelengths are specified in "datafile"
1337 + as well as the number of spectral samples.
1338 + The function "func" will be called with two parameters, the
1339 + interpolated spectral value for the current coordinate and the
1340 + associated wavelength.
1341 + If the spectrum is broken into 12 components, then 12 calls
1342 + will be made to "func" for the relevant ray evaluation.
1343 + .LP
1344 + .UL Specpict
1345 + .PP
1346 + Specpict is a special case of specdata, where the pattern is
1347 + a hyperspectral image stored in the common-exponent file format.
1348 + The dimensions of the image data are determined by the picture
1349 + just as with the colorpict primitive.
1350 + .DS
1351 + mod specpict id
1352 + 5+
1353 +        func specfile
1354 +        funcfile u v transform
1355 + 0
1356 + m A1 A2 .. Am
1357 + .DE
1358 + The function "func" is called with the interpolated pixel value
1359 + and the wavelength sample in nanometers, the same as specdata,
1360 + with as many calls made as there are components in "specfile".
1361   .NH 3
1362   Mixtures
1363   .PP
1364   A mixture is a blend of one or more materials or textures and patterns.
1365 + Blended materials should not be light source types or virtual source types.
1366   The basic types are given below.
1367   .LP
1368   .UL Mixfunc
# Line 1093 | Line 1384 | which serves as a form of opacity control when used wi
1384   Vname is the coefficient defined in funcfile that determines the influence
1385   of foreground.
1386   The background coefficient is always (1-vname).
1096 – Since the references are not resolved until runtime, the last
1097 – definitions of the modifier id's will be used.
1098 – This can result in modifier loops, which are detected by the
1099 – renderer.
1387   .LP
1388   .UL Mixdata
1389   .PP
# Line 1197 | Line 1484 | and they are listed in the file
1484   The following variables are particularly important:
1485   .DS
1486          Dx, Dy, Dz              - incident ray direction
1200 –        Px, Py, Pz              - intersection point
1487          Nx, Ny, Nz              - surface normal at intersection point
1488 +        Px, Py, Pz              - intersection point
1489 +        T                       - distance from start
1490 +        Ts                      - single ray (shadow) distance
1491          Rdot                    - cosine between ray and normal
1492          arg(0)                  - number of real arguments
1493          arg(i)                  - i'th real argument
1494   .DE
1495 + For mesh objects, the local surface coordinates are available:
1496 + .DS
1497 +        Lu, Lv                  - local (u,v) coordinates
1498 + .DE
1499   For BRDF types, the following variables are defined as well:
1500   .DS
1501          NxP, NyP, NzP           - perturbed surface normal
# Line 1217 | Line 1510 | If no file is needed by a given primitive because all
1510   variables are global, a period (`.') can be given in
1511   place of the file name.
1512   It is also possible to give an expression instead of a straight
1513 < variable name in a scene file, although such expressions should
1514 < be kept simple as they cannot contain any white space.
1222 < Also, functions (requiring parameters)
1513 > variable name in a scene file.
1514 > Functions (requiring parameters)
1515   must be given as names and not as expressions.
1516   .PP
1517   Constant expressions are used as an optimization in function
# Line 1383 | Line 1675 | converts a picture to and from simpler formats.
1675   Pictures may be displayed directly under X11 using the program
1676   .I ximage,
1677   or converted a standard image format.
1678 < .I Ra_avs
1679 < converts to and from AVS image format.
1388 < .I Ra_pict
1389 < converts to Macintosh 32-bit PICT2 format.
1678 > .I Ra_bmp
1679 > converts to and from Microsoft Bitmap images.
1680   .I Ra_ppm
1681   converts to and from Poskanzer Portable Pixmap formats.
1392 – .I Ra_pr
1393 – converts to and from Sun 8-bit rasterfile format.
1394 – .I Ra_pr24
1395 – converts to and from Sun 24-bit rasterfile format.
1682   .I Ra_ps
1683   converts to PostScript color and greyscale formats.
1684   .I Ra_rgbe
# Line 1408 | Line 1694 | converts to and from Radiance CIE picture format.
1694   .NH 1
1695   License
1696   .PP
1697 < Radiance is a registered copyright of The Regents of the University of
1698 < California ("The Regents"). The Regents grant to you a nonexclusive,
1699 < nontransferable license ("License") to use Radiance source code without fee.
1700 < You may not sell or distribute Radiance to others without the prior express
1701 < written permission of The Regents.
1702 < You may compile and use this software on any machines to which you have
1703 < personal access, and may share its use with others who have access to the
1704 < same machines.
1705 < .PP
1706 < NEITHER THE UNITED STATES NOR THE UNITED STATES DEPARTMENT OF ENERGY, NOR ANY
1707 < OF THEIR EMPLOYEES, MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY
1708 < LEGAL LIABILITY OR RESPONSIBILITY FOR THE ACCURACY, COMPLETENESS, OR
1709 < USEFULNESS OF ANY INFORMATION, APPARATUS, PRODUCT, OR PROCESS DISCLOSED, OR
1710 < REPRESENTS THAT ITS USE WOULD NOT INFRINGE PRIVATELY OWNED RIGHTS.
1711 < By downloading, using or copying this software, you agree to abide by the
1712 < intellectual property laws and all other applicable laws of the United
1713 < States, and by the terms of this License Agreement. Ownership of the software
1714 < shall remain solely in The Regents.
1715 < The Regents shall have the right to terminate this License immediately by
1716 < written notice upon your breach of, or noncompliance with, any of its terms.
1717 < You shall be liable for any infringement or damages resulting from your
1718 < failure to abide by the terms of this License Agreement.
1719 < .PP
1720 < NOTICE: The Government is granted for itself and others acting on its behalf
1721 < a paid-up, nonexclusive irrevocable worldwide license in this data to
1722 < reproduce, prepare derivative works, and perform publicly and display
1723 < publicly. Beginning five (5) years after permission to assert copyright is
1724 < granted, subject to two possible five year renewals, the Government is
1725 < granted for itself and others acting on its behalf a paid-up, non-exclusive,
1726 < irrevocable worldwide license in this data to reproduce, prepare derivative
1727 < works, distribute copies to the public, perform publicly and display
1728 < publicly, and to permit others to do so.
1697 > .DS
1698 > The Radiance Software License, Version 1.0
1699 >
1700 > Copyright (c) 1990 - 2008 The Regents of the University of California,
1701 > through Lawrence Berkeley National Laboratory.   All rights reserved.
1702 >
1703 > Redistribution and use in source and binary forms, with or without
1704 > modification, are permitted provided that the following conditions
1705 > are met:
1706 >
1707 > 1. Redistributions of source code must retain the above copyright
1708 >        notice, this list of conditions and the following disclaimer.
1709 >
1710 > 2. Redistributions in binary form must reproduce the above copyright
1711 >      notice, this list of conditions and the following disclaimer in
1712 >      the documentation and/or other materials provided with the
1713 >      distribution.
1714 >
1715 > 3. The end-user documentation included with the redistribution,
1716 >          if any, must include the following acknowledgment:
1717 >            "This product includes Radiance software
1718 >                (http://radsite.lbl.gov/)
1719 >                developed by the Lawrence Berkeley National Laboratory
1720 >              (http://www.lbl.gov/)."
1721 >      Alternately, this acknowledgment may appear in the software itself,
1722 >      if and wherever such third-party acknowledgments normally appear.
1723 >
1724 > 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
1725 >      and "The Regents of the University of California" must
1726 >      not be used to endorse or promote products derived from this
1727 >      software without prior written permission. For written
1728 >      permission, please contact [email protected].
1729 >
1730 > 5. Products derived from this software may not be called "Radiance",
1731 >      nor may "Radiance" appear in their name, without prior written
1732 >      permission of Lawrence Berkeley National Laboratory.
1733 >
1734 > THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
1735 > WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1736 > OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1737 > DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
1738 > ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
1739 > SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
1740 > LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
1741 > USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
1742 > ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
1743 > OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
1744 > OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1745 > SUCH DAMAGE.
1746 > .DE
1747   .NH 1
1748   Acknowledgements
1749   .PP
# Line 1455 | Line 1759 | the Ecole Polytechnique Federale de Lausanne (EPFL Uni
1759   in Lausanne, Switzerland.
1760   .NH 1
1761   References
1762 + .LP
1763 + Ward, Gregory J., Bruno Bueno, David Geisler-Moroder,
1764 + Lars O. Grobe, Jacob C. Jonsson, Eleanor
1765 + S. Lee, Taoning Wang, Helen Rose Wilson,
1766 + ``Daylight Simulation Workflows Incorporating
1767 + Measured Bidirectional Scattering Distribution Functions,''
1768 + .I "Energy & Buildings",
1769 + Vol. 259, No. 111890, 2022.
1770 + .LP
1771 + Wang, Taoning, Gregory Ward, Eleanor Lee,
1772 + ``Efficient modeling of optically-complex, non-coplanar
1773 + exterior shading: Validation of matrix algebraic methods,''
1774 + .I "Energy & Buildings",
1775 + vol. 174, pp. 464-83, Sept. 2018.
1776 + .LP
1777 + Lee, Eleanor S., David Geisler-Moroder, Gregory Ward,
1778 + ``Modeling the direct sun component in buildings using matrix
1779 + algebraic approaches: Methods and validation,''
1780 + .I Solar Energy,
1781 + vol. 160, 15 January 2018, pp 380-395.
1782 + .LP
1783 + Ward, G., M. Kurt & N. Bonneel,
1784 + ``Reducing Anisotropic BSDF Measurement to Common Practice,''
1785 + .I Workshop on Material Appearance Modeling,
1786 + 2014.
1787 + .LP
1788 + McNeil, A., C.J. Jonsson, D. Appelfeld, G. Ward, E.S. Lee,
1789 + ``A validation of a ray-tracing tool used to generate
1790 + bi-directional scattering distribution functions for
1791 + complex fenestration systems,''
1792 + .I "Solar Energy",
1793 + 98, 404-14, November 2013.
1794 + .LP
1795 + Ward, G., R. Mistrick, E.S. Lee, A. McNeil, J. Jonsson,
1796 + ``Simulating the Daylight Performance of Complex Fenestration Systems
1797 + Using Bidirectional Scattering Distribution Functions within Radiance,''
1798 + .I "Leukos",
1799 + 7(4),
1800 + April 2011.
1801 + .LP
1802 + Cater, K., A. Chalmers, G. Ward,
1803 + ``Detail to Attention: Exploiting Visual Tasks for Selective Rendering,''
1804 + .I "Eurograhics Symposium on Rendering",
1805 + June 2003.
1806 + .LP
1807 + Ward, G., Elena Eydelberg-Vileshin,
1808 + ``Picture Perfect RGB Rendering Using Spectral Prefiltering and
1809 + Sharp Color Primaries,''
1810 + 13th Eurographics Workshop on Rendering, P. Debevec and
1811 + S. Gibson (Editors), June 2002.
1812 + .LP
1813 + Ward, G. and M. Simmons,
1814 + ``The Holodeck Ray Cache: An Interactive Rendering System for Global
1815 + Illumination in Nondiffuse Environments,''
1816 + .I "ACM Transactions on Graphics,"
1817 + 18(4):361-98, October 1999.
1818 + .LP
1819 + Larson, G.W., H. Rushmeier, C. Piatko,
1820 + ``A Visibility Matching Tone Reproduction Operator for High Dynamic
1821 + Range Scenes,''
1822 + .I "IEEE Transactions on Visualization and Computer Graphics",
1823 + 3(4), 291-306, December 1997.
1824 + .LP
1825 + Ward, G.,
1826 + ``Making Global Illumination User Friendly,''
1827 + .I "Sixth Eurographics Workshop on Rendering",
1828 + proceedings to be published by Springer-Verlag,
1829 + Dublin, Ireland, June 1995.
1830 + .LP
1831 + Rushmeier, H., G. Ward, C. Piatko, P. Sanders, B. Rust,
1832 + ``Comparing Real and Synthetic Images: Some Ideas about Metrics,''
1833 + .I "Sixth Eurographics Workshop on Rendering",
1834 + proceedings to be published by Springer-Verlag,
1835 + Dublin, Ireland, June 1995.
1836   .LP
1837   Ward, G.,
1838   ``The Radiance Lighting Simulation and Rendering System,''

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