cmpfn_tp set_ordering (cmpfn_tp criterion, lie_Index n, object g)
{ if (criterion!=height_decr && criterion!=height_incr) return criterion;
if (g==NULL || n!=Lierank(g))
return criterion==height_decr ? deg_decr : deg_incr; /* substitute */
if (level_vec==NULL
|| int_eq_grp_grp(g,level_vec_group)==(object)bool_false)
{ if (level_vec!=NULL) freearr(level_vec);
level_vec=Lv(g); level_vec_group=g;
}
return criterion;
}
Spectrum EmissionIntegrator::Li(const Scene *scene,
const Renderer *renderer, const RayDifferential &ray,
const Sample *sample, RNG &rng, Spectrum *T,
MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
Assert(sample != NULL);
float t0, t1;
if (!vr || !vr->IntersectP(ray, &t0, &t1) || (t1-t0) == 0.f) {
*T = Spectrum(1.f);
return 0.f;
}
// Do emission-only volume integration in _vr_
Spectrum Lv(0.);
// Prepare for volume integration stepping
int nSamples = Ceil2Int((t1-t0) / stepSize);
float step = (t1 - t0) / nSamples;
Spectrum Tr(1.f);
pbrt::Point p = ray(t0), pPrev;
Vector w = -ray.d;
t0 += sample->oneD[scatterSampleOffset][0] * step;
for (int i = 0; i < nSamples; ++i, t0 += step) {
// Advance to sample at _t0_ and update _T_
pPrev = p;
p = ray(t0);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, ray.time, ray.depth);
Spectrum stepTau = vr->tau(tauRay,
.5f * stepSize, rng.RandomFloat());
Tr *= Exp(-stepTau);
// Possibly terminate ray marching if transmittance is small
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (rng.RandomFloat() > continueProb) {
Tr = 0.f;
break;
}
Tr /= continueProb;
}
// Compute emission-only source term at _p_
Lv += Tr * vr->Lve(p, w, ray.time);
}
*T = Tr;
return Lv * step;
}
Spectrum VSDScatteringIntegrator::LiSingle(const Scene *scene, const Renderer *renderer,
const RayDifferential &ray, const Sample *sample, RNG &rng,
Spectrum *T, MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
float t0, t1;
vr->IntersectP(ray, &t0, &t1);
// Do single scattering volume integration in _vr_
Spectrum Lv(0.);
// Prepare for volume integration stepping
int nSamples = Ceil2Int((t1-t0) / stepSize);
float step = (t1 - t0) / nSamples;
Spectrum Tr(1.f);
Point p = ray(t0), pPrev;
t0 += sample->oneD[scatterSampleOffset][0] * step;
// Compute the emission from the voxels, not from the light sources
for (int i = 0; i < nSamples; ++i, t0 += step) {
// Advance to sample at _t0_ and update _T_
pPrev = p;
p = ray(t0);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, ray.time, ray.depth);
Spectrum stepTau = vr->tau(tauRay,
.5f * stepSize, rng.RandomFloat());
Tr *= Exp(-stepTau);
// Possibly terminate ray marching if transmittance is small
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (rng.RandomFloat() > continueProb) {
Tr = 0.f;
break;
}
Tr /= continueProb;
}
// Compute emission term at _p_
Lv += Tr * vr->PhotonDensity(p);
}
*T = Tr;
return Lv * step;
}
Spectrum SingleScatteringFluorescenceRWLIntegrator::Li(const Scene *scene,
const Renderer *renderer, const RayDifferential &ray,
const Sample *sample, RNG &rng, Spectrum *T, MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
float t0, t1;
if (!vr || !vr->IntersectP(ray, &t0, &t1) || (t1-t0) == 0.f) {
*T = 1.f;
return 0.f;
}
// Do single scattering volume integration in _vr_
Spectrum Lv(0.);
// Prepare for volume integration stepping
int nSamples = Ceil2Int((t1-t0) / stepSize);
float step = (t1 - t0) / nSamples;
Spectrum Tr(1.f);
Point p = ray(t0), pPrev;
Vector w = -ray.d;
t0 += sample->oneD[scatterSampleOffset][0] * step;
// Compute sample patterns for single scattering samples
float *lightNum = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightNum, rng);
float *lightComp = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightComp, rng);
float *lightPos = arena.Alloc<float>(2*nSamples);
LDShuffleScrambled2D(1, nSamples, lightPos, rng);
uint32_t sampOffset = 0;
for (int i = 0; i < nSamples; ++i, t0 += step) {
// Advance to sample at _t0_ and update _T_
pPrev = p;
p = ray(t0);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, ray.time, ray.depth);
Spectrum stepTau = vr->tau(tauRay, 0.5f * stepSize, rng.RandomFloat());
Tr *= Exp(-stepTau);
// Possibly terminate ray marching if transmittance is small
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (rng.RandomFloat() > continueProb) {
Tr = 0.f;
break;
}
Tr /= continueProb;
}
// Compute fluorescence emission
Spectrum sigma = vr->Mu(p, w, ray.time);
if (!sigma.IsBlack() && scene->lights.size() > 0) {
int nLights = scene->lights.size();
int ln = min(Floor2Int(lightNum[sampOffset] * nLights),
nLights-1);
Light *light = scene->lights[ln];
// Add contribution of _light_ due to the in-scattering at _p_
float pdf;
VisibilityTester vis;
Vector wo;
LightSample ls(lightComp[sampOffset], lightPos[2*sampOffset],
lightPos[2*sampOffset+1]);
Spectrum L = light->Sample_L(p, 0.f, ls, ray.time, &wo, &pdf, &vis);
if (!L.IsBlack() && pdf > 0.f && vis.Unoccluded(scene)) {
Spectrum Ld = L * vis.Transmittance(scene, renderer, NULL, rng,
arena);
int lambdaExcIndex = light->GetLaserWavelengthIndex();
float Lpower = Ld.GetLaserEmissionPower(lambdaExcIndex);
float yield = vr->Yeild(Point());
Spectrum fEx = vr->fEx(Point());
Spectrum fEm = vr->fEm(Point());
float scale = fEx.GetSampleValueAtWavelengthIndex(lambdaExcIndex);
Lv += Lpower * Tr * sigma * vr->p(p, w, -wo, ray.time) *
scale * fEm * yield * float(nLights) / pdf;
}
}
++sampOffset;
}
*T = Tr;
return Lv * step;
}
Spectrum SingleScatteringIntegrator::Li(const Scene *scene, const Renderer *renderer,
const RayDifferential &ray, const Sample *sample,
Spectrum *T, MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
float t0, t1;
if (!vr || !vr->IntersectP(ray, &t0, &t1)) {
*T = 1.f;
return 0.f;
}
// Do single scattering volume integration in _vr_
Spectrum Lv(0.);
// Prepare for volume integration stepping
int nSamples = Ceil2Int((t1-t0) / stepSize);
float step = (t1 - t0) / nSamples;
Spectrum Tr(1.f);
Point p = ray(t0), pPrev;
Vector w = -ray.d;
t0 += sample->oneD[scatterSampleOffset][0] * step;
// Compute sample patterns for single scattering samples
float *lightNum = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightNum, *sample->rng);
float *lightComp = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightComp, *sample->rng);
float *lightPos = arena.Alloc<float>(2*nSamples);
LDShuffleScrambled2D(1, nSamples, lightPos, *sample->rng);
u_int sampOffset = 0;
for (int i = 0; i < nSamples; ++i, t0 += step) {
// Advance to sample at _t0_ and update _T_
pPrev = p;
p = ray(t0);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, ray.time, ray.depth);
Spectrum stepTau = vr->tau(tauRay,
.5f * stepSize, sample->rng->RandomFloat());
Tr *= Exp(-stepTau);
// Possibly terminate ray marching if transmittance is small
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (sample->rng->RandomFloat() > continueProb) break;
Tr /= continueProb;
}
// Compute single-scattering source term at _p_
Lv += Tr * vr->Lve(p, w, ray.time);
Spectrum ss = vr->sigma_s(p, w, ray.time);
if (!ss.IsBlack() && scene->lights.size() > 0) {
int nLights = scene->lights.size();
int ln = min(Floor2Int(lightNum[sampOffset] * nLights),
nLights-1);
Light *light = scene->lights[ln];
// Add contribution of _light_ due to scattering at _p_
float pdf;
VisibilityTester vis;
Vector wo;
LightSample ls(lightComp[sampOffset], lightPos[2*sampOffset],
lightPos[2*sampOffset+1]);
Spectrum L = light->Sample_L(p, 0.f, ls, ray.time, &wo, &pdf, &vis);
if (!L.IsBlack() && pdf > 0.f && vis.Unoccluded(scene)) {
Spectrum Ld = L * vis.Transmittance(scene, renderer, NULL, sample->rng, arena);
Lv += Tr * ss * vr->p(p, w, -wo, ray.time) * Ld * float(nLights) / pdf;
}
}
++sampOffset;
}
*T = Tr;
return Lv * step;
}
Spectrum PhotonVolumeIntegrator::Li(const Scene *scene, const Renderer *renderer,
const RayDifferential &ray, const Sample *sample, RNG &rng,
Spectrum *T, MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
RainbowVolume* rv = dynamic_cast<RainbowVolume*>(vr);
KdTree<Photon>* volumeMap = photonShooter->volumeMap;
float t0, t1;
if (!vr || !vr->IntersectP(ray, &t0, &t1) || (t1-t0) == 0.f){
*T = 1.f;
return 0.f;
}
// Do single scattering & photon multiple scattering volume integration in _vr_
Spectrum Lv(0.);
// Prepare for volume integration stepping
int nSamples = Ceil2Int((t1-t0) / stepSize);
float step = (t1 - t0) / nSamples;
Spectrum Tr(1.f);
Point p = ray(t0), pPrev;
Vector w = -ray.d;
t0 += sample->oneD[scatterSampleOffset][0] * step;
float *lightNum = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightNum, rng);
float *lightComp = arena.Alloc<float>(nSamples);
LDShuffleScrambled1D(1, nSamples, lightComp, rng);
float *lightPos = arena.Alloc<float>(2*nSamples);
LDShuffleScrambled2D(1, nSamples, lightPos, rng);
int sampOffset = 0;
ClosePhoton *lookupBuf = new ClosePhoton[nSamples];
for (int i = 0; i < nSamples; ++i, t0 += step) {
// Advance to sample at _t0_ and update _T_
pPrev = p;
p = ray(t0);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, ray.time, ray.depth);
Spectrum stepTau = vr->tau(tauRay,.5f * stepSize, rng.RandomFloat());
Tr = Exp(-stepTau);
// Possibly terminate raymarching if transmittance is small.
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (rng.RandomFloat() > continueProb){
Tr = 0.f;
break;
}
Tr /= continueProb;
}
// Compute single-scattering source term at _p_ & photon mapped MS
Spectrum L_i(0.);
Spectrum L_d(0.);
Spectrum L_ii(0.);
// Lv += Tr*vr->Lve(p, w, ray.time);
Spectrum ss = vr->sigma_s(p, w, ray.time);
Spectrum sa = vr->sigma_a(p, w, ray.time);
if (!ss.IsBlack() && scene->lights.size() > 0) {
int nLights = scene->lights.size();
int ln =
min(Floor2Int(lightNum[sampOffset] * nLights),
nLights-1);
Light *light = scene->lights[ln];
// Add contribution of _light_ due to scattering at _p_
float pdf;
VisibilityTester vis;
Vector wo;
LightSample ls(lightComp[sampOffset], lightPos[2*sampOffset],
lightPos[2*sampOffset+1]);
Spectrum L = light->Sample_L(p, 0.f, ls, ray.time, &wo, &pdf, &vis);
if (!L.IsBlack() && pdf > 0.f && vis.Unoccluded(scene)) {
Spectrum Ld = L * vis.Transmittance(scene,renderer, NULL, rng, arena);
if(rv){
L_d = rv->rainbowReflection(Ld, ray.d, wo);
}
else {
L_d = vr->p(p, w, -wo, ray.time) * Ld * float(nLights)/pdf;
}
}
}
// Compute 'indirect' in-scattered radiance from photon map
if(!rv){
L_ii += LPhoton(volumeMap, nUsed, lookupBuf, w, p, vr, maxDistSquared, ray.time);
}
// Compute total in-scattered radiance
if (sa.y()!=0.0 || ss.y()!=0.0)
L_i = L_d + (ss/(sa+ss))*L_ii;
else
L_i = L_d;
Spectrum nLv = (sa*vr->Lve(p,w,ray.time)*step) + (ss*L_i*step) + (Tr * Lv) ;
Lv = nLv;
sampOffset++;
}
*T = Tr;
return Lv;
}
Spectrum
VolumeIntegrator::Li(Ray ray, Spectrum *T) {
int numSamples;
double step;
int numVolumes = mScene->getVolumeCount();
VolumeRegion **volumes = mScene->getVolumes();
if(numVolumes < 1) {
return 0.;
}
double t1, t0 = 0;
Vec3 n;
Surface surface;
if(!volumes[0]->bounds().test_intersect(ray, &t0, &t1, &n)) return 0;
if(ray.maxt < t1)
t1 = ray.maxt;
numSamples = (int)((t1 - t0) / mStepSize);
if(numSamples == 0) numSamples = 1;
//printf("NumSamples: %d\n", numSamples);
step = (t1 - t0) / (double)numSamples;
t0 += ((rand() / (float)RAND_MAX)) * step;
//printf("T02: %f\n", t0);
//printf("step: %f\n", step);
//TODO: NOTE: multiple volumes will need aggregators!
//*T = *T * Color(0.5);
Spectrum Lv(0);
LightSource** lights = mScene->getLightSources();
Vec3 p = ray(t0);
Vec3 pPrev;
Vec3 w = ray.direction * -1;
Spectrum Tr(1.);
for( int i = 0; i < numSamples; ++i, t0 += step )
{
pPrev = p;
p = ray(t0);
//printf("T03: %f\n", t0);
//printf("Step: %f\n", step);
//printf("Difference: %s %s\n", p.str(), ray(t0 + step).str());
//printf("Curr T: %f\n", (p - pPrev).length());
Ray tRay = Ray(pPrev, p - pPrev, 0.0, step);
Spectrum stepTau = volumes[0]->tau(tRay, 0.5 * step, 0);
Tr = Tr * Exp(stepTau * -1);
if (Tr.toTrans() < 1e-3) {
const float continueProb = .5f;
if ((rand() / (float)RAND_MAX) > continueProb) break;
Tr = Tr / continueProb;
}//else if (stepTau.toTrans() > 0.99995)
// continue;
Lv = Lv + volumes[0]->Lve(p);
Spectrum ss = volumes[0]->sigma_s(p);
if(!ss.isBlack()) {
//printf("Lighting?\n");
LightSource *light = lights[0];
Vec3 wL = light->position - p;
wL.norm();
Ray shadRay = Ray(p, wL);
if(!mScene->intersect(shadRay, &surface) || (surface.t > (p-wL).length()))
{
Spectrum lTr = Exp(volumes[0]->tau(shadRay, mStepSize * 2, 0.0) * -1);
//printf("P: %s\n", p.str());
//printf("LTR: %f, %f, %f\n", lTr.r(), lTr.g(), lTr.b());
Spectrum Ld = lTr * lights[0]->color;
//printf("Not black.\n\tcurloc: %f, %f, %f\n\tlightTrn: %.2f, %.2f, %.2f\n\tLightCol: %.2f, %.2f, %.2f\n\tSingleSc: %.2f, %.2f, %.2f\n\tCurTrans: %.2f, %.2f, %.2f\n", \
p.x(), p.y(), p.z(), lTr.r(), lTr.g(), lTr.b(), lights[0]->color.r(), lights[0]->color.g(), lights[0]->color.b(), ss.r(), ss.g(), ss.b(), Tr.r(), Tr.g(), Tr.b());
Lv = Lv + Ld * ss * Tr;// * volumes[0]->phase(p, w, wL * 1);
//printf("Phase: %f\n", volumes[0]->phase(p, w, wL));
}
}
Spectrum VSDScatteringIntegrator::LiMultiple(const Scene *scene, const Renderer *renderer,
const RayDifferential &ray, const Sample *sample, RNG &rng,
Spectrum *T, MemoryArena &arena) const {
VolumeRegion *vr = scene->volumeRegion;
float t0, t1;
vr->IntersectP(ray, &t0, &t1);
// Do multiple scattering volume integration in _vr_
Spectrum Lv(0.);
// Prepare for random walk
Spectrum Tr(1.f);
Point p = ray(t0), pPrev = ray.o;
// printf("%f %f %f, ", p.x, p.y, p.z);
int steps = 0;
// Sample the events in a random walk
// BBox bb = vr->WorldBound();
// printf("%f %f %f & %f %f %f \n",
// bb.pMin.x, bb.pMin.y, bb.pMin.z, bb.pMax.x, bb.pMax.y, bb.pMax.z);
while(vr->WorldBound().Inside(p)) {
//printf("%f %f %f %d \n", p.x, p.y, p.z, steps);
steps++;
// Sample direction
Vector wi = -ray.d, wo;
float pdfDirection = 0.f;
if(!vr->SampleDirection(p, wi, wo, &pdfDirection, rng)) {
// printf("return 1 \n");
return Lv;
}
Ray r(p, wo, 0);
// Sample a distance
float pdfDistance = 0.f;
float tDist;
Point pSample;
if(!vr->SampleDistance(r, &tDist, pSample, &pdfDistance, rng)) {
// printf("return 2 \n");
return Lv;
}
// Compute the transmittance
pPrev = p;
p = r(tDist);
Ray tauRay(pPrev, p - pPrev, 0.f, 1.f, r.time, r.depth);
Spectrum stepTau = vr->tau(tauRay, .5f * stepSize, rng.RandomFloat());
Tr *= Exp(-stepTau);
// Possibly terminate random walk if transmittance is small
if (Tr.y() < 1e-3) {
const float continueProb = .5f;
if (rng.RandomFloat() > continueProb) {
Tr = 0.f;
// printf("return 3 \n");
break;
}
Tr /= continueProb;
}
// Compute emission term at _p_
Lv += Tr * vr->PhotonDensity(p) / (pdfDistance * pdfDirection);
}
// printf("%f %f %f %d \n", p.x, p.y, p.z, steps);
// printf("%d, ", steps);
return Lv;
}
