// Glossy Method Definitions
BSDF *GlossyCombined::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgs) const
{
// Allocate _BSDF_
// NOTE - lordcrc - changed clamping to 0..1 to avoid >1 reflection
SWCSpectrum d(Kd->Evaluate(sw, dgs).Clamp(0.f, 1.f));
SWCSpectrum s(Ks->Evaluate(sw, dgs));
float i = index->Evaluate(sw, dgs);
if (i > 0.f) {
const float ti = (i - 1.f) / (i + 1.f);
s *= ti * ti;
}
s = s.Clamp(0.f, 1.f);
SWCSpectrum a(Ka->Evaluate(sw, dgs).Clamp(0.f, 1.f));
// Clamp roughness values to avoid artifacts with too small values
const float u = Clamp(nu->Evaluate(sw, dgs), 6e-3f, 1.f);
const float v = Clamp(nv->Evaluate(sw, dgs), 6e-3f, 1.f);
const float u2 = u * u;
const float v2 = v * v;
float ld = depth->Evaluate(sw, dgs);
const float anisotropy = u2 < v2 ? 1.f - u2 / v2 : v2 / u2 - 1.f;
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgs,
isect.dg.nn, ARENA_ALLOC(arena, SchlickBRDF)(d, s, a, ld, u * v,
anisotropy, multibounce), isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}
// Glass Method Definitions
BSDF *Null::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgShading) const
{
// Allocate _BSDF_, possibly doing bump-mapping with _bumpMap_
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgShading,
isect.dg.nn, ARENA_ALLOC(arena, NullTransmission)(),
isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}
// Mirror Method Definitions
BSDF *Mirror::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgs) const
{
// Allocate _BSDF_
float flm = film->Evaluate(sw, dgs);
float flmindex = filmindex->Evaluate(sw, dgs);
// NOTE - lordcrc - changed clamping to 0..1 to avoid >1 reflection
SWCSpectrum R = Kr->Evaluate(sw, dgs).Clamp(0.f, 1.f);
BxDF *bxdf = ARENA_ALLOC(arena, SpecularReflection)(R,
ARENA_ALLOC(arena, FresnelNoOp)(), flm, flmindex);
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgs,
isect.dg.nn, bxdf, isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}
// Matte Method Definitions
BSDF *Matte::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgs) const
{
// Allocate _BSDF_
// Evaluate textures for _Matte_ material and allocate BRDF
// NOTE - lordcrc - changed clamping to 0..1 to avoid >1 reflection
SWCSpectrum r = Kd->Evaluate(sw, dgs).Clamp(0.f, 1.f);
float sig = Clamp(sigma->Evaluate(sw, dgs), 0.f, 90.f);
BxDF *bxdf;
if (sig == 0.f)
bxdf = ARENA_ALLOC(arena, Lambertian)(r);
else
bxdf = ARENA_ALLOC(arena, OrenNayar)(r, sig);
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgs,
isect.dg.nn, bxdf, isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}
// Velvet Method Definitions
BSDF *Velvet::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgs) const
{
// Allocate _BSDF_
SWCSpectrum r = Kd->Evaluate(sw, dgs).Clamp(0.f, 1.f);
float p1 = Clamp(P1->Evaluate(sw, dgs), -100.f, 100.f);
float p2 = Clamp(P2->Evaluate(sw, dgs), -100.f, 100.f);
float p3 = Clamp(P3->Evaluate(sw, dgs), -100.f, 100.f);
float thickness = Clamp(Thickness->Evaluate(sw, dgs), 0.0f, 1.f);
BxDF *bxdf = ARENA_ALLOC(arena, Asperity)(r, p1, p2, p3, thickness);
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgs,
isect.dg.nn, bxdf, isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}
BSDF *Metal2::GetBSDF(MemoryArena &arena, const SpectrumWavelengths &sw,
const Intersection &isect, const DifferentialGeometry &dgs) const
{
// Allocate _BSDF_
float u = nu->Evaluate(sw, dgs);
float v = nv->Evaluate(sw, dgs);
const float u2 = u * u;
const float v2 = v * v;
const float anisotropy = u2 < v2 ? 1.f - u2 / v2 : v2 / u2 - 1.f;
SchlickDistribution *md = ARENA_ALLOC(arena, SchlickDistribution)(u * v, anisotropy);
FresnelGeneral *fr = ARENA_ALLOC(arena, FresnelGeneral)(fresnel->Evaluate(sw, dgs));
MicrofacetReflection *bxdf = ARENA_ALLOC(arena, MicrofacetReflection)(1.f,
fr, md, false);
SingleBSDF *bsdf = ARENA_ALLOC(arena, SingleBSDF)(dgs,
isect.dg.nn, bxdf, isect.exterior, isect.interior);
// Add ptr to CompositingParams structure
bsdf->SetCompositingParams(&compParams);
return bsdf;
}