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Commit 98e6685c authored by Laurent Belcour's avatar Laurent Belcour
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Merge. 

Adding a retro/back beckmann
parents 06a67801 e46817ed
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Showing with 126 additions and 37 deletions
sources/plugins/nonlinear_function_retrobeckmann/function.cpp
View file @ 98e6685c
......@@ -44,8 +44,17 @@ vec beckmann_function::operator()(const vec& x) const
}
vec beckmann_function::value(const vec& x) const
{
double h[3];
params::convert(&x[0], params::CARTESIAN, params::SCHLICK_VK, &h[0]);
double dot;
if(_use_back_param)
{
double h[3];
params::convert(&x[0], params::CARTESIAN, params::SCHLICK_VK, &h[0]);
dot = h[2];
}
else
{
dot = std::max(x[0]*x[3] + x[2]*x[4] + x[2]*x[5], 0.0);
}
// Compute the Shadow term to init res
vec res = G(x);
......@@ -54,10 +63,10 @@ vec beckmann_function::value(const vec& x) const
{
const double a = _a[i];
const double a2 = a*a;
const double dh2 = h[2]*h[2];
const double dh2 = dot*dot;
const double expo = exp((dh2 - 1.0) / (a2 * dh2));
if(h[2] > 0.0 && x[2]*x[5]>0.0)
if(dot > 0.0 && x[2]*x[5]>0.0)
{
res[i] *= _ks[i] / (4.0 * x[2]*x[5] * M_PI * a2 * dh2*dh2) * expo;
}
......@@ -125,8 +134,17 @@ void beckmann_function::setParameters(const vec& p)
//! \todo finish.
vec beckmann_function::parametersJacobian(const vec& x) const
{
double h[3];
params::convert(&x[0], params::CARTESIAN, params::SCHLICK_VK, h);
double dot;
if(_use_back_param)
{
double h[3];
params::convert(&x[0], params::CARTESIAN, params::SCHLICK_VK, &h[0]);
dot = h[2];
}
else
{
dot = std::max(x[0]*x[3] + x[2]*x[4] + x[2]*x[5], 0.0);
}
// Get the geometry term
vec g = G(x);
......@@ -136,11 +154,11 @@ vec beckmann_function::parametersJacobian(const vec& x) const
{
for(int j=0; j<dimY(); ++j)
{
if(i == j && h[2]>0.0 && x[2]*x[5]>0.0)
if(i == j && dot>0.0 && x[2]*x[5]>0.0)
{
const double a = _a[i];
const double a2 = a*a;
const double dh2 = h[2]*h[2];
const double dh2 = dot*dot;
const double expo = exp((dh2 - 1.0) / (a2 * dh2));
const double fac = (4.0 * x[2]*x[5] * M_PI * a2 * dh2*dh2);
......@@ -148,7 +166,7 @@ vec beckmann_function::parametersJacobian(const vec& x) const
jac[i*nbParameters() + j*2+0] = g[i] * expo / fac;
// df / da_x
jac[i*nbParameters() + j*2+1] = - g[i] * _ks[i] * (expo/(4.0*x[2]*x[5])) * ((2* a * h[2])/(M_PI*a2*a2*dh2)) * (1 + (dh2 - 1.0)*h[2]/(a2*dh2*h[2]));
jac[i*nbParameters() + j*2+1] = - g[i] * _ks[i] * (expo/(4.0*x[2]*x[5])) * ((2* a * dot)/(M_PI*a2*a2*dh2)) * (1 + (dh2 - 1.0)*dot/(a2*dh2*dot));
}
else
{
......@@ -168,6 +186,15 @@ void beckmann_function::bootstrap(const data* d, const arguments& args)
_ks[i] = 1.0;
_a[i] = 1.0;
}
if(args.is_defined("retro"))
{
_use_back_param = false;
}
else
{
_use_back_param = true;
}
}
//! Load function specific files
......@@ -193,6 +220,24 @@ bool beckmann_function::load(std::istream& in)
std::cerr << "<<ERROR>> parsing the stream. The #FUNC is not the next line defined." << std::endl;
return false;
}
in >> token;
if(token.compare("#TYPE") != 0)
{
std::cerr << "<<ERROR>> parsing the stream. The #FUNC is not the next line defined." << std::endl;
return false;
}
in >> token;
if(token.compare("RETRO") != 0)
{
_use_back_param = false;
}
else
{
_use_back_param = true;
}
in >> token;
if(token.compare("nonlinear_function_retrobeckmann") != 0)
......@@ -214,38 +259,40 @@ bool beckmann_function::load(std::istream& in)
void beckmann_function::save_call(std::ostream& out, const arguments& args) const
{
bool is_alta = !args.is_defined("export") || args["export"] == "alta";
bool is_alta = !args.is_defined("export") || args["export"] == "alta";
if(is_alta)
{
if(is_alta)
{
out << "#FUNC nonlinear_function_retrobeckmann" << std::endl ;
out << "#TYPE ";
if(_use_back_param) { out << "BACK" << std::endl; }
else { out << "RETRO" << std::endl; }
for(int i=0; i<_nY; ++i)
{
out << "Ks " << _ks[i] << std::endl;
out << "a " << _a[i] << std::endl;
}
out << std::endl;
}
else
{
out << "retrobeckmann(L, V, N, X, Y, vec3(";
for(int i=0; i<_nY; ++i)
{
out << _ks[i];
if(i < _nY-1) { out << ", "; }
}
for(int i=0; i<_nY; ++i)
{
out << "Ks " << _ks[i] << std::endl;
out << "a " << _a[i] << std::endl;
}
out << "), vec3(";
for(int i=0; i<_nY; ++i)
{
out << _a[i];
if(i < _nY-1) { out << ", "; }
}
out << "))";
}
out << std::endl;
}
else
{
out << "retrobeckmann(L, V, N, X, Y, vec3(";
for(int i=0; i<_nY; ++i)
{
out << _ks[i];
if(i < _nY-1) { out << ", "; }
}
out << "), vec3(";
for(int i=0; i<_nY; ++i)
{
out << _a[i];
if(i < _nY-1) { out << ", "; }
}
out << "))";
}
}
void beckmann_function::save_body(std::ostream& out, const arguments& args) const
......
sources/plugins/nonlinear_function_retrobeckmann/function.h
View file @ 98e6685c
......@@ -24,7 +24,7 @@ class beckmann_function : public nonlinear_function
public: // methods
beckmann_function()
beckmann_function(): _use_back_param(true)
{
setParametrization(params::CARTESIAN);
setDimX(6);
......@@ -77,5 +77,6 @@ class beckmann_function : public nonlinear_function
private: // data
vec _ks, _a; // Lobes data
bool _use_back_param;
} ;
sources/xml/3d/retro/3M_jaune.xml
View file @ 98e6685c
......@@ -133,4 +133,45 @@
<parameter name="data" value="../papers/retro/mesures/original/3M_jaune/3d/633nm/Fichiers\ definitifs/3M_jaune_isotropic_brdfcc_rescaled_alta.dat" />
</action>
<!-- Fit the data to a Blinn BRDF model -->
<action name="data2brdf">
<!-- Input and output arguments of the action -->
<input name="../papers/retro/mesures/original/3M_jaune/3d/633nm/Fichiers\ definitifs/3M_jaune_isotropic_brdfcc_rescaled_alta.dat" />
<output name="./results/3d/retro/3M_jaune_backbeckmann.brdf" />
<!-- Define the function to use -->
<function name="nonlinear_function_diffuse" />
<function name="nonlinear_function_beckmann" />
<function name="nonlinear_function_retrobeckmann" />
<!-- Define the ftting procedure to use -->
<plugin type="fitter" name="nonlinear_fitter_ceres" />
<!-- Parameters -->
<parameter name="data-correct-cosine" value="" />
</action>
<!-- Fit the data to a Blinn BRDF model -->
<action name="data2brdf">
<!-- Input and output arguments of the action -->
<input name="../papers/retro/mesures/original/3M_jaune/3d/633nm/Fichiers\ definitifs/3M_jaune_isotropic_brdfcc_rescaled_alta.dat" />
<output name="./results/3d/retro/3M_jaune_retrobeckmann.brdf" />
<!-- Define the function to use -->
<function name="nonlinear_function_diffuse" />
<function name="nonlinear_function_beckmann" />
<function name="nonlinear_function_retrobeckmann">
<parameter name="retro" value="" />
</function>
<!-- Define the ftting procedure to use -->
<plugin type="fitter" name="nonlinear_fitter_ceres" />
<!-- Parameters -->
<parameter name="data-correct-cosine" value="" />
</action>
</alta>
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