helix_path.cpp

Go to the documentation of this file.

#include "helix_path.hpp"
 
using namespace generator;
 
helix_path_t::helix_path_t(double radius, double size, int segments, double start, double sweep)
    : parametric_path_{[radius, size, start, sweep](double t)
                       {
                           path_vertex_t vertex;
                           const double angle = start + t * sweep;
                           const double sine = std::sin(angle);
                           const double cosine = std::cos(angle);
 
                           vertex.position = gml::dvec3{radius * cosine, radius * sine, 2.0 * t * size - size};
 
                           vertex.tangent = gml::normalize(gml::dvec3{
                               -radius * sine,
                               radius * cosine,
                               2.0 * size / sweep,
                           });
 
                           vertex.normal = gml::dvec3{cosine, sine, 0.0};
 
                           vertex.tex_coord = t;
 
                           return vertex;
                       },
                       segments}
{
}