Function CreateLightningRodPositions

Descent3/fireball.cpp:2468–2496

Creates end points that simulate lightning

}
// Creates end points that simulate lightning
void CreateLightningRodPositions(vector *src, vector *dest, vector *world_vecs, int num_segments, float rand_mag,
                                 bool do_flat) {
  vector delta_vec = *dest - *src;
  matrix mat;

  // Setup some interpolants
  float mag = vm_GetMagnitudeFast(&delta_vec);
  float delta_dist = mag / num_segments;
  delta_vec /= mag;
  // Create matrix for randomization
  vm_VectorToMatrix(&mat, &delta_vec, NULL, NULL);

  vector cur_pos = *src;

  vector from = cur_pos;
  world_vecs[0] = from;
  world_vecs[num_segments - 1] = *dest;
  // Create the points
  for (int i = 1; i < num_segments - 1; i++, cur_pos += (delta_vec * delta_dist)) {
    vector to = cur_pos + (delta_vec * delta_dist);
    // vector to=world_vecs[i-1]+(delta_vec*delta_dist);
    to += mat.rvec * ((((ps_rand() % 200) - 100) / 100.0) * rand_mag);
    if (!do_flat)
      to += mat.uvec * ((((ps_rand() % 200) - 100) / 100.0) * rand_mag);
    ASSERT(i < 50);

    world_vecs[i] = to;
  }
}