low.h

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#ifndef _BBM_LOW_FITMODELS_H_
#define _BBM_LOW_FITMODELS_H_
 
#include "bbm/bsdfmodel.h"
#include "bsdfmodel/ashikhminshirley.h"
#include "bsdfmodel/lambertian.h"
#include "bsdfmodel/lowmicrofacet.h"
 
/************************************************************************/
/*! \file low.h
 
  \brief The bsdfmodels used for the BSDF paramter fits in the supplemental
  material of: "BRDF models for accurate and efficient rendering of glossy
  surfaces" [Low 2012]: https://doi.org/10.1145/2077341.2077350
 
**************************************************************************/
namespace bbm {
 
  /**********************************************************************/
  /*! \brief Low et al.'s version of the specular component of the
      Ashikhmin-Shirley BSDF: uses the Cook-Torrance Fresnel component with
      index of refraction.
  ***********************************************************************/
  template<typename CONF, string_literal NAME="LowAshikhminShirley"> requires concepts::config<CONF>
    using lowashikhminshirley = scaledmodel<ashikhminshirley<CONF, fresnel::cook<CONF, ior::ior<Value_t<CONF>>>, symmetry_v::Isotropic, NAME>, bsdf_attr::SpecularScale>;
  
  /**********************************************************************/
  /*! \brief Low et al.'s version of the specular component of the
      Cook-Torrance BSDF; this directly mirrors the original Cook-Torrance
      implementation.
  ***********************************************************************/
  template<typename CONF, string_literal NAME="LowCookTorrance"> requires concepts::config<CONF>
    using lowcooktorrance = cooktorrance<CONF, "LowCookTorrance">;
  
  /**********************************************************************/
  /*! \brief Shorthand for the Low BSDF model compatible with the fits listed
      in their supplemental material which differs from the model in the paper
      by using a different normalization factor.
  ***********************************************************************/
  template<typename CONF, string_literal NAME="LowMicrofacetFit"> requires concepts::config<CONF>
    using lowmicrofacetfit = lowmicrofacet<CONF, microfacet_n::Cook, NAME>;
 
  BBM_CHECK_CONCEPT(concepts::bsdfmodel, lowmicrofacetfit<config>);
 
} // end bbm namespace
 
#endif /* _BBM_LOW_FITMODELS_H_ */
 
BBM_EXPORT_BSDFMODEL(bbm::lowashikhminshirley)
BBM_EXPORT_BSDFMODEL(bbm::lowcooktorrance)
BBM_EXPORT_BSDFMODEL(bbm::lowmicrofacetfit)