paysages3d/src/render/software/GodRaysResult.cpp

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#include "GodRaysResult.h"
GodRaysResult::GodRaysResult(double inside_length, double full_length):
inside_length(inside_length), full_length(full_length)
{
}
Color GodRaysResult::apply(const Color &raw, const Color &atmosphered, const GodRaysParams &params)
{
if (inside_length == 0.0)
{
return raw;
}
else if (inside_length < full_length)
{
double diff = full_length - inside_length;
double factor = 1.0 - params.penetration * diff;
double minimum = params.resistance;
double complement = 1.0 - minimum;
if (factor < minimum)
{
factor = minimum;
}
else
{
factor = pow((factor - minimum) / complement, params.boost) * complement + minimum;
}
return Color(raw.r + (atmosphered.r - raw.r) * factor,
raw.g + (atmosphered.g - raw.g) * factor,
raw.b + (atmosphered.b - raw.b) * factor,
atmosphered.a);
}
else
{
return atmosphered;
}
}