CrossSectionGenerator.cpp

#include "CrossSectionGenerator.h"
 
#include <glm/gtc/quaternion.hpp>
 
bool Cogs::Geometry::CrossSectionGenerator::generateCircularCrossection(glm::vec3 * vertices, int numSegments, float radius, float startAngle, float endAngle, bool wrapAround)
{
  if (!vertices || numSegments <= 0 || radius == 0 || endAngle <= startAngle) return false;
 
  glm::vec3 vec(radius, 0.0f, 0.0f);
  float totalAngle = endAngle - startAngle;
 
  int extra = wrapAround ? 1 : 0;
 
  float angleIncrement = (totalAngle / static_cast<float>(numSegments - extra));
 
  for (int i = 0; i < numSegments; i++) {
    auto rotation = glm::angleAxis(startAngle + angleIncrement * static_cast<float>(i), glm::vec3(0, 0, 1));
    
    glm::vec3 arcIncrement = rotation * vec;
 
    vertices[i] = arcIncrement;
  }
 
  return true;
}