void configure() {
unsigned int extraFlags = 0;
if (m_alphaU != m_alphaV)
extraFlags |= EAnisotropic;
m_components.clear();
m_components.push_back(EGlossyReflection | EFrontSide | extraFlags
| ((!m_specularReflectance->isConstant() || !m_alphaU->isConstant()
|| !m_alphaV->isConstant()) ? ESpatiallyVarying : 0));
m_components.push_back(EDiffuseReflection | EFrontSide | extraFlags
| (m_diffuseReflectance->isConstant() ? 0 : ESpatiallyVarying));
/* Verify the input parameters and fix them if necessary */
std::pair<Texture *, Texture *> result = ensureEnergyConservation(
m_specularReflectance, m_diffuseReflectance,
"specularReflectance", "diffuseReflectance", 1.0f);
m_specularReflectance = result.first;
m_diffuseReflectance = result.second;
/* Compute weights that steer samples towards
the specular or diffuse components */
Float dAvg = m_diffuseReflectance->getAverage().getLuminance(),
sAvg = m_specularReflectance->getAverage().getLuminance();
m_specularSamplingWeight = sAvg / (dAvg + sAvg);
m_usesRayDifferentials =
m_diffuseReflectance->usesRayDifferentials() ||
m_specularReflectance->usesRayDifferentials() ||
m_alphaU->usesRayDifferentials() ||
m_alphaV->usesRayDifferentials();
BSDF::configure();
}
void configure() {
/* Verify the input parameters and fix them if necessary */
m_transmittance = ensureEnergyConservation(m_transmittance, "transmittance", 1.0f);
m_components.clear();
m_components.push_back(EDiffuseTransmission | EFrontSide | EBackSide
| (m_transmittance->isConstant() ? 0 : ESpatiallyVarying));
BSDF::configure();
}
void configure() {
/* Verify the input parameters and fix them if necessary */
m_specularReflectance = ensureEnergyConservation(
m_specularReflectance, "specularReflectance", 1.0f);
m_usesRayDifferentials =
m_specularReflectance->usesRayDifferentials();
m_components.clear();
m_components.push_back(EDeltaReflection | EFrontSide
| (m_specularReflectance->isConstant() ? 0 : ESpatiallyVarying));
BSDF::configure();
}
void configure() {
unsigned int extraFlags = 0;
if (!m_sigmaA->isConstant() || !m_alpha->isConstant())
extraFlags |= ESpatiallyVarying;
m_components.clear();
for (int i=0; i<m_nested->getComponentCount(); ++i)
m_components.push_back(m_nested->getType(i) | extraFlags);
m_components.push_back(EGlossyReflection | EFrontSide | EBackSide
| (m_specularReflectance->isConstant() ? 0 : ESpatiallyVarying));
m_usesRayDifferentials = m_nested->usesRayDifferentials()
|| m_sigmaA->usesRayDifferentials()
|| m_alpha->usesRayDifferentials()
|| m_specularReflectance->usesRayDifferentials();
/* Compute weights that further steer samples towards
the specular or nested components */
Float avgAbsorption = (m_sigmaA->getAverage()
*(-2*m_thickness)).exp().average();
m_specularSamplingWeight = 1.0f / (avgAbsorption + 1.0f);
/* Verify the input parameters and fix them if necessary */
m_specularReflectance = ensureEnergyConservation(
m_specularReflectance, "specularReflectance", 1.0f);
if (!m_roughTransmittance.get()) {
/* Load precomputed data used to compute the rough
transmittance through the dielectric interface */
m_roughTransmittance = new RoughTransmittance(
m_distribution.getType());
m_roughTransmittance->checkEta(m_eta);
m_roughTransmittance->checkAlpha(m_alpha->getMinimum().average());
m_roughTransmittance->checkAlpha(m_alpha->getMaximum().average());
/* Reduce the rough transmittance data to a 2D slice */
m_roughTransmittance->setEta(m_eta);
/* If possible, even reduce it to a 1D slice */
if (m_alpha->isConstant())
m_roughTransmittance->setAlpha(
m_alpha->eval(Intersection()).average());
}
BSDF::configure();
}
void configure() {
unsigned int extraFlags = 0;
if (m_alphaU != m_alphaV)
extraFlags |= EAnisotropic;
if (!m_alphaU->isConstant() || !m_alphaV->isConstant() ||
!m_specularReflectance->isConstant())
extraFlags |= ESpatiallyVarying;
m_components.clear();
m_components.push_back(EGlossyReflection | EFrontSide | extraFlags);
/* Verify the input parameters and fix them if necessary */
m_specularReflectance = ensureEnergyConservation(
m_specularReflectance, "specularReflectance", 1.0f);
m_usesRayDifferentials =
m_alphaU->usesRayDifferentials() ||
m_alphaV->usesRayDifferentials() ||
m_specularReflectance->usesRayDifferentials();
BSDF::configure();
}