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#ifndef lint |
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static const char RCSid[] = "$Id: raycalls.c,v 2.32 2025/04/23 02:35:26 greg Exp $"; |
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#endif |
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/* |
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* raycalls.c - interface for running Radiance rendering as a library |
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* |
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* External symbols declared in ray.h |
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*/ |
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|
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#include "copyright.h" |
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|
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/* |
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* These routines are designed to aid the programmer who wishes |
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* to call Radiance as a library. Unfortunately, the system was |
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* not originally intended to be run this way, and there are some |
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* awkward limitations to contend with. The most irritating |
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* perhaps is that the global variables and functions do not have |
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* a prefix, and the symbols are a bit generic. This results in a |
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* serious invasion of the calling application's name-space, and |
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* you may need to rename either some Radiance routines or some |
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* of your routines to avoid conflicts. Another limitation is |
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* that the global variables are not gathered together into any |
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* sort of context, so it is impossible to simultaneously run |
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* this library on multiple scenes or in multiple threads. |
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* You get one scene and one thread, and if you want more, you |
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* will have to go with the process model defined in raypcalls.c. |
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* Finally, unrecoverable errors result in a call to the application- |
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* defined function quit(). The usual thing to do is to call exit(). |
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* You might want to do something else instead, like |
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* call setjmp()/longjmp() to bring you back to the calling |
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* function for recovery. You may also wish to define your own |
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* wputs(s) and eputs(s) functions to output warning and error |
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* messages, respectively. |
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* |
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* With those caveats, we have attempted to make the interface |
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* as simple as we can. Global variables and their defaults |
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* are defined below, and including "ray.h" declares these |
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* along with all the routines you are likely to need. First, |
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* assign the global variable progname by calling fixargv0(argv[0]), |
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* then change the rendering parameters as you like. If you have a |
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* set of option arguments you are working from, the getrenderopt() |
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* call should be very useful. Before tracing any rays, you |
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* must read in the octree with a call to ray_init(oct). |
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* Passing NULL for the file name causes ray_init() to read |
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* the octree from the standard input -- rarely a good idea. |
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* However, one may read an octree from a program (such as |
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* oconv) by preceding a shell command by a '!' character. |
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* |
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* To trace a ray, define a RAY object myRay and assign: |
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* |
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* myRay.rorg = ( ray origin point ) |
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* myRay.rdir = ( normalized ray direction ) |
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* myRay.rmax = ( maximum length, or zero for no limit ) |
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* |
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* If you are rendering from a VIEW structure, this can be |
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* accomplished with a single call for the ray at (x,y): |
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* |
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* myRay.rmax = viewray(myRay.rorg, myRay.rdir, &myView, x, y); |
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* |
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* Then, trace the primary ray with: |
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* |
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* ray_trace(&myRay); |
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* |
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* The resulting contents of myRay should provide you with |
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* more than enough information about what the ray hit, |
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* the computed value, etc. For further clues of how to |
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* compute irradiance, how to get callbacks on the evaluated |
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* ray tree, etc., see the contents of rtrace.c. See |
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* also the rpmain.c, rtmain.c, and rvmain.c modules |
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* to learn more how rendering options are processed. |
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* |
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* When you are done, you may call ray_done(1) to clean |
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* up memory used by Radiance. It doesn't free everything, |
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* but it makes a valiant effort. If you call ray_done(0), |
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* it leaves data that is likely to be reused, including |
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* loaded data files and fonts. The library may be |
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* restarted at any point by calling ray_init() on a new |
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* octree. |
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* |
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* The call ray_save(rp) fills a parameter structure |
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* with the current global parameter settings, which may be |
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* restored at any time with a call to ray_restore(rp). |
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* This buffer contains no linked information, and thus |
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* may be passed between processes using write() and |
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* read() calls, so long as byte order is maintained. |
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* Calling ray_restore(NULL) restores the original |
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* default parameters, which is also retrievable with |
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* the call ray_defaults(rp). (These should be the |
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* same as the defaults for rtrace.) |
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*/ |
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|
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#include <string.h> |
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#include <time.h> |
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|
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#include "ray.h" |
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#include "source.h" |
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#include "bsdf.h" |
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#include "ambient.h" |
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#include "otypes.h" |
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#include "random.h" |
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#include "func.h" |
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#include "data.h" |
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#include "font.h" |
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#include "pmapray.h" |
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|
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char *octname; /* octree name we are given */ |
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|
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CUBE thescene; /* our scene */ |
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OBJECT nsceneobjs; /* number of objects in our scene */ |
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|
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int dimlist[MAXDIM]; /* sampling dimensions */ |
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int ndims = 0; /* number of sampling dimensions */ |
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int samplendx = 0; /* index for this sample */ |
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|
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void (*trace)() = NULL; /* trace call */ |
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|
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void (*addobjnotify[8])() = {ambnotify, NULL}; |
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|
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int castonly = 0; /* only doing ray-casting? */ |
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|
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int do_irrad = 0; /* compute irradiance? */ |
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|
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int rand_samp = 1; /* pure Monte Carlo sampling? */ |
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|
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double dstrsrc = 0.0; /* square source distribution */ |
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double shadthresh = .03; /* shadow threshold */ |
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double shadcert = .75; /* shadow certainty */ |
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int directrelay = 2; /* number of source relays */ |
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int vspretest = 512; /* virtual source pretest density */ |
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int directvis = 1; /* sources visible? */ |
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double srcsizerat = .2; /* maximum ratio source size/dist. */ |
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|
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COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
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COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
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double seccg = 0.; /* global scattering eccentricity */ |
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double ssampdist = 0.; /* scatter sampling distance */ |
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|
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double specthresh = .15; /* specular sampling threshold */ |
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double specjitter = 1.; /* specular sampling jitter */ |
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|
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int backvis = 1; /* back face visibility */ |
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|
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int maxdepth = -10; /* maximum recursion depth */ |
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double minweight = 1e-4; /* minimum ray weight */ |
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|
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char *ambfile = NULL; /* ambient file name */ |
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COLOR ambval = BLKCOLOR; /* ambient value */ |
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int ambvwt = 0; /* initial weight for ambient value */ |
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double ambacc = 0.1; /* ambient accuracy */ |
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int ambres = 256; /* ambient resolution */ |
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int ambdiv = 1024; /* ambient divisions */ |
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int ambssamp = 512; /* ambient super-samples */ |
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int ambounce = 0; /* ambient bounces */ |
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char *amblist[AMBLLEN+1]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
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|
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static void |
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reset_random(void) /* re-initialize random number generator */ |
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{ |
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if (rand_samp) { |
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srandom((long)time(0)); |
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initurand(0); |
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} else { |
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srandom(0L); |
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initurand(2048); |
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} |
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} |
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|
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|
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void |
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ray_init( /* initialize ray-tracing calculation */ |
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char *otnm |
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) |
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{ |
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if (nobjects > 0) /* free old scene data */ |
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ray_done(0); |
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/* initialize object types */ |
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if (ofun[OBJ_SPHERE].funp == o_default) |
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initotypes(); |
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/* initialize calcomp routines */ |
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initfunc(); |
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/* initialize urand */ |
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reset_random(); |
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/* initialize spectral sampling */ |
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if (setspectrsamp(CNDX, WLPART) < 0) |
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error(USER, "unsupported spectral sampling"); |
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|
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octname = savqstr(otnm); /* read scene octree */ |
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readoct(octname, ~(IO_FILES|IO_INFO), &thescene, NULL); |
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nsceneobjs = nobjects; |
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|
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if (!castonly) { /* any actual ray traversal to do? */ |
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|
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ray_init_pmap(); /* PMAP: set up & load photon maps */ |
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|
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marksources(); /* find and mark sources */ |
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|
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setambient(); /* initialize ambient calculation */ |
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} else |
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distantsources(); /* else mark only distant sources */ |
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} |
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|
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|
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void |
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ray_trace( /* trace a primary ray */ |
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RAY *r |
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) |
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{ |
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rayorigin(r, PRIMARY, NULL, NULL); |
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samplendx++; |
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rayvalue(r); /* assumes origin and direction are set */ |
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} |
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|
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|
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void |
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ray_done( /* free ray-tracing data */ |
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int freall |
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) |
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{ |
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retainfonts = 1; |
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ambdone(); |
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ambnotify(OVOID); |
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freesources(); |
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freeobjects(0, nobjects); |
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donesets(); |
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octdone(); |
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thescene.cutree = EMPTY; |
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freeqstr(octname); octname = NULL; |
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retainfonts = 0; |
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if (freall) { |
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freefont(NULL); |
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freedata(NULL); |
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SDfreeCache(NULL); |
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initurand(0); |
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} |
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if (nobjects > 0) { |
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sprintf(errmsg, "%ld objects left after call to ray_done()", |
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(long)nobjects); |
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error(WARNING, errmsg); |
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} |
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|
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ray_done_pmap(); |
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} |
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|
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|
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void |
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ray_save( /* save current parameter settings */ |
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RAYPARAMS *rp |
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) |
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{ |
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int i, ndx; |
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|
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if (rp == NULL) |
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return; |
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rp->do_irrad = do_irrad; |
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rp->rand_samp = rand_samp; |
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rp->dstrsrc = dstrsrc; |
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rp->shadthresh = shadthresh; |
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rp->shadcert = shadcert; |
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rp->directrelay = directrelay; |
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rp->vspretest = vspretest; |
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rp->directvis = directvis; |
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rp->srcsizerat = srcsizerat; |
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copycolor(rp->cextinction, cextinction); |
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copycolor(rp->salbedo, salbedo); |
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rp->seccg = seccg; |
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rp->ssampdist = ssampdist; |
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rp->specthresh = specthresh; |
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rp->specjitter = specjitter; |
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rp->backvis = backvis; |
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rp->maxdepth = maxdepth; |
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rp->minweight = minweight; |
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if (ambfile != NULL) |
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strncpy(rp->ambfile, ambfile, sizeof(rp->ambfile)-1); |
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else |
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memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
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copycolor(rp->ambval, ambval); |
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rp->ambvwt = ambvwt; |
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rp->ambacc = ambacc; |
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rp->ambres = ambres; |
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rp->ambdiv = ambdiv; |
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rp->ambssamp = ambssamp; |
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rp->ambounce = ambounce; |
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rp->ambincl = ambincl; |
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memset(rp->amblval, '\0', sizeof(rp->amblval)); |
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ndx = 0; |
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for (i = 0; i < AMBLLEN && amblist[i] != NULL; i++) { |
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int len = strlen(amblist[i]); |
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if (ndx+len >= sizeof(rp->amblval)) |
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break; |
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strcpy(rp->amblval+ndx, amblist[i]); |
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rp->amblndx[i] = ndx; |
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ndx += len+1; |
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} |
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while (i <= AMBLLEN) |
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rp->amblndx[i++] = -1; |
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|
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/* PMAP: save photon mapping params */ |
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ray_save_pmap(rp); |
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} |
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|
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|
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void |
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ray_restore( /* restore parameter settings */ |
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RAYPARAMS *rp |
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) |
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{ |
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int i; |
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|
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if (rp == NULL) { /* restore defaults */ |
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RAYPARAMS dflt; |
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ray_defaults(&dflt); |
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ray_restore(&dflt); |
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return; |
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} |
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/* restore saved settings */ |
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do_irrad = rp->do_irrad; |
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if (!rand_samp != !rp->rand_samp) { |
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rand_samp = rp->rand_samp; |
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reset_random(); |
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} |
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dstrsrc = rp->dstrsrc; |
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shadthresh = rp->shadthresh; |
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shadcert = rp->shadcert; |
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directrelay = rp->directrelay; |
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vspretest = rp->vspretest; |
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directvis = rp->directvis; |
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srcsizerat = rp->srcsizerat; |
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copycolor(cextinction, rp->cextinction); |
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copycolor(salbedo, rp->salbedo); |
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seccg = rp->seccg; |
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ssampdist = rp->ssampdist; |
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specthresh = rp->specthresh; |
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specjitter = rp->specjitter; |
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backvis = rp->backvis; |
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maxdepth = rp->maxdepth; |
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minweight = rp->minweight; |
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copycolor(ambval, rp->ambval); |
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ambvwt = rp->ambvwt; |
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ambdiv = rp->ambdiv; |
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ambssamp = rp->ambssamp; |
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ambounce = rp->ambounce; |
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/* a bit dangerous if not static */ |
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for (i = 0; rp->amblndx[i] >= 0; i++) |
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amblist[i] = rp->amblval + rp->amblndx[i]; |
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while (i <= AMBLLEN) |
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amblist[i++] = NULL; |
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ambincl = rp->ambincl; |
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/* update ambient calculation */ |
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ambnotify(OVOID); |
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if ((thescene.cutree != EMPTY) & !castonly) { |
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int newamb = (ambfile == NULL) ? rp->ambfile[0] : |
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strcmp(ambfile, rp->ambfile) ; |
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|
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if (amblist[0] != NULL) |
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for (i = 0; i < nobjects; i++) |
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ambnotify(i); |
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|
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ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL; |
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if (newamb) { |
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ambres = rp->ambres; |
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ambacc = rp->ambacc; |
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setambient(); |
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} else { |
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setambres(rp->ambres); |
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setambacc(rp->ambacc); |
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} |
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} else { |
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ambfile = (rp->ambfile[0]) ? rp->ambfile : (char *)NULL; |
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ambres = rp->ambres; |
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ambacc = rp->ambacc; |
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} |
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|
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/* PMAP: restore photon mapping params */ |
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ray_restore_pmap(rp); |
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} |
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|
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|
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void |
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ray_defaults( /* get default parameter values */ |
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RAYPARAMS *rp |
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) |
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{ |
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int i; |
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|
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if (rp == NULL) |
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return; |
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|
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rp->do_irrad = 0; |
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rp->rand_samp = 1; |
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rp->dstrsrc = 0.0; |
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rp->shadthresh = 0.03; |
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rp->shadcert = 0.75; |
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rp->directrelay = 2; |
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rp->vspretest = 512; |
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rp->directvis = 1; |
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rp->srcsizerat = .2; |
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setcolor(rp->cextinction, 0., 0., 0.); |
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setcolor(rp->salbedo, 0., 0., 0.); |
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rp->seccg = 0.; |
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rp->ssampdist = 0.; |
| 403 |
rp->specthresh = 0.15; |
| 404 |
rp->specjitter = 1.; |
| 405 |
rp->backvis = 1; |
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rp->maxdepth = -10; |
| 407 |
rp->minweight = 1e-4; |
| 408 |
memset(rp->ambfile, '\0', sizeof(rp->ambfile)); |
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setcolor(rp->ambval, 0., 0., 0.); |
| 410 |
rp->ambvwt = 0; |
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rp->ambres = 256; |
| 412 |
rp->ambacc = 0.1; |
| 413 |
rp->ambdiv = 1024; |
| 414 |
rp->ambssamp = 512; |
| 415 |
rp->ambounce = 0; |
| 416 |
rp->ambincl = -1; |
| 417 |
memset(rp->amblval, '\0', sizeof(rp->amblval)); |
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for (i = AMBLLEN+1; i--; ) |
| 419 |
rp->amblndx[i] = -1; |
| 420 |
|
| 421 |
/* PMAP: restore photon mapping defaults */ |
| 422 |
ray_defaults_pmap(rp); |
| 423 |
} |
