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The ray tracer function....

a guest Dec 10th, 2019 115 Never
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  1. For David M.
  2.  
  3. float ct_trace(glm::vec3 from, glm::vec3 direction) {
  4.     float distance_total = 0.0;
  5.     int steps;
  6.     for (steps = 0; steps < 64; steps++) {
  7.         glm::vec3 p = from + distance_total * direction;
  8.         float distance_sum = 9999.;
  9.  
  10.         glm::vec3 p_0 = p + glm::vec3(-3., 0., 0.);
  11.         glm::vec3 p_1 = p + glm::vec3(3., 0., 0.);
  12.         glm::vec3 p_2 = p + glm::vec3(0., 3., 0.);
  13.         glm::vec3 p_3 = p + glm::vec3(0., -3., 0.);
  14.         glm::vec3 p_4 = p + glm::vec3(0., .0, -3.);
  15.         glm::vec3 p_5 = p + glm::vec3(0., .0, 3.);
  16.  
  17.         //float color_0 = ct_box(p_1, glm::vec3(1., 1., 1.));
  18.         //float color_1 = ct_box(p_1, glm::vec3(1., 1., 1.));
  19.         //float color_2 = ct_box(p_2, glm::vec3(1., 1., 1.));
  20.         //float color_3 = ct_box(p_3, glm::vec3(1., 1., 1.));
  21.         // float color_4 = ct_box(p_4, glm::vec3(1., 1., 1.));
  22.         //float color_5 = ct_box(p_5, glm::vec3(1., 1., 1.));
  23.  
  24.         float color_0 = ct_torus(p_0, glm::vec2(1., 1.));
  25.         float color_1 = ct_torus(p_1, glm::vec2(1., 1.));
  26.         float color_2 = ct_torus(p_2, glm::vec2(1., 1.));
  27.         float color_3 = ct_torus(p_3, glm::vec2(1., 1.));
  28.         float color_4 = ct_torus(p_4, glm::vec2(1., 1.));
  29.         float color_5 = ct_torus(p_4, glm::vec2(1., 1.));
  30.  
  31.         float color_6 = ct_box(p, glm::vec3(2., 2., 2.)); //ct_sphere_distance(p, 2.);
  32.         float color_7 = ct_sphere_distance(p, 1.0);
  33.  
  34.         distance_sum = glm::min(distance_sum, color_0);
  35.         distance_sum = glm::min(distance_sum, color_1);
  36.         distance_sum = glm::min(distance_sum, color_2);
  37.         distance_sum = glm::min(distance_sum, color_3);
  38.         distance_sum = glm::min(distance_sum, color_4);
  39.         distance_sum = glm::min(distance_sum, color_5);
  40.         distance_sum = glm::min(distance_sum, color_6);
  41.         //distance_sum = glm::min(distance_sum, color_7);
  42.  
  43.         distance_total += distance_sum;
  44.         if (distance_sum < .001)
  45.         {
  46.             break;
  47.         }
  48.     }
  49.     return 1.0 - float(steps) / float(64);
  50. }
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