Function ScaleRegionProjections

src/colmap/mvs/texture_mapping.cc:479–506

}

void ScaleRegionProjections(std::vector<RegionProjection>& projections,
                            const double scale) {
  const float sf = static_cast<float>(scale);
  for (auto& rp : projections) {
    for (auto& fp : rp.face_projections) {
      for (auto& p : fp) {
        p *= sf;
      }
    }
    // Recompute bounding box from scaled projections.
    float min_x = std::numeric_limits<float>::max();
    float min_y = std::numeric_limits<float>::max();
    float max_x = std::numeric_limits<float>::lowest();
    float max_y = std::numeric_limits<float>::lowest();
    for (const auto& fp : rp.face_projections) {
      for (const auto& p : fp) {
        min_x = std::min(min_x, p.x());
        min_y = std::min(min_y, p.y());
        max_x = std::max(max_x, p.x());
        max_y = std::max(max_y, p.y());
      }
    }
    rp.bbox_x = static_cast<int>(std::floor(min_x));
    rp.bbox_y = static_cast<int>(std::floor(min_y));
    rp.bbox_width = static_cast<int>(std::ceil(max_x)) - rp.bbox_x + 1;
    rp.bbox_height = static_cast<int>(std::ceil(max_y)) - rp.bbox_y + 1;
  }
}

AtlasLayout PackAtlas(const std::vector<RegionProjection>& projections,
                      const std::vector<FaceRegion>& regions,