geometric_shape_to_BVH_model.h

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#ifndef COAL_GEOMETRIC_SHAPE_TO_BVH_MODEL_H
#define COAL_GEOMETRIC_SHAPE_TO_BVH_MODEL_H
 
#include "coal/shape/geometric_shapes.h"
#include "coal/BVH/BVH_model.h"
#include <boost/math/constants/constants.hpp>
 
namespace coal {
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Box& shape,
                      const Transform3s& pose) {
  CoalScalar a = shape.halfSide[0];
  CoalScalar b = shape.halfSide[1];
  CoalScalar c = shape.halfSide[2];
  std::vector<Vec3s> points(8);
  std::vector<Triangle> tri_indices(12);
  points[0] = Vec3s(a, -b, c);
  points[1] = Vec3s(a, b, c);
  points[2] = Vec3s(-a, b, c);
  points[3] = Vec3s(-a, -b, c);
  points[4] = Vec3s(a, -b, -c);
  points[5] = Vec3s(a, b, -c);
  points[6] = Vec3s(-a, b, -c);
  points[7] = Vec3s(-a, -b, -c);
 
  tri_indices[0].set(0, 4, 1);
  tri_indices[1].set(1, 4, 5);
  tri_indices[2].set(2, 6, 3);
  tri_indices[3].set(3, 6, 7);
  tri_indices[4].set(3, 0, 2);
  tri_indices[5].set(2, 0, 1);
  tri_indices[6].set(6, 5, 7);
  tri_indices[7].set(7, 5, 4);
  tri_indices[8].set(1, 5, 2);
  tri_indices[9].set(2, 5, 6);
  tri_indices[10].set(3, 7, 0);
  tri_indices[11].set(0, 7, 4);
 
  for (unsigned int i = 0; i < points.size(); ++i) {
    points[i] = pose.transform(points[i]).eval();
  }
 
  model.beginModel();
  model.addSubModel(points, tri_indices);
  model.endModel();
  model.computeLocalAABB();
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Sphere& shape,
                      const Transform3s& pose, unsigned int seg,
                      unsigned int ring) {
  std::vector<Vec3s> points;
  std::vector<Triangle> tri_indices;
 
  CoalScalar r = shape.radius;
  CoalScalar phi, phid;
  const CoalScalar pi = boost::math::constants::pi<CoalScalar>();
  phid = pi * 2 / seg;
  phi = 0;
 
  CoalScalar theta, thetad;
  thetad = pi / (ring + 1);
  theta = 0;
 
  for (unsigned int i = 0; i < ring; ++i) {
    CoalScalar theta_ = theta + thetad * (i + 1);
    for (unsigned int j = 0; j < seg; ++j) {
      points.push_back(Vec3s(r * sin(theta_) * cos(phi + j * phid),
                             r * sin(theta_) * sin(phi + j * phid),
                             r * cos(theta_)));
    }
  }
  points.push_back(Vec3s(0, 0, r));
  points.push_back(Vec3s(0, 0, -r));
 
  for (unsigned int i = 0; i < ring - 1; ++i) {
    for (unsigned int j = 0; j < seg; ++j) {
      unsigned int a, b, c, d;
      a = i * seg + j;
      b = (j == seg - 1) ? (i * seg) : (i * seg + j + 1);
      c = (i + 1) * seg + j;
      d = (j == seg - 1) ? ((i + 1) * seg) : ((i + 1) * seg + j + 1);
      tri_indices.push_back(Triangle(a, c, b));
      tri_indices.push_back(Triangle(b, c, d));
    }
  }
 
  for (unsigned int j = 0; j < seg; ++j) {
    unsigned int a, b;
    a = j;
    b = (j == seg - 1) ? 0 : (j + 1);
    tri_indices.push_back(Triangle(ring * seg, a, b));
 
    a = (ring - 1) * seg + j;
    b = (j == seg - 1) ? (ring - 1) * seg : ((ring - 1) * seg + j + 1);
    tri_indices.push_back(Triangle(a, ring * seg + 1, b));
  }
 
  for (unsigned int i = 0; i < points.size(); ++i) {
    points[i] = pose.transform(points[i]);
  }
 
  model.beginModel();
  model.addSubModel(points, tri_indices);
  model.endModel();
  model.computeLocalAABB();
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Sphere& shape,
                      const Transform3s& pose,
                      unsigned int n_faces_for_unit_sphere) {
  CoalScalar r = shape.radius;
  CoalScalar n_low_bound =
      std::sqrt((CoalScalar)n_faces_for_unit_sphere / CoalScalar(2.)) * r * r;
  unsigned int ring = (unsigned int)ceil(n_low_bound);
  unsigned int seg = (unsigned int)ceil(n_low_bound);
 
  generateBVHModel(model, shape, pose, seg, ring);
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Cylinder& shape,
                      const Transform3s& pose, unsigned int tot,
                      unsigned int h_num) {
  std::vector<Vec3s> points;
  std::vector<Triangle> tri_indices;
 
  CoalScalar r = shape.radius;
  CoalScalar h = shape.halfLength;
  CoalScalar phi, phid;
  const CoalScalar pi = boost::math::constants::pi<CoalScalar>();
  phid = pi * 2 / tot;
  phi = 0;
 
  CoalScalar hd = 2 * h / h_num;
 
  for (unsigned int i = 0; i < tot; ++i)
    points.push_back(
        Vec3s(r * cos(phi + phid * i), r * sin(phi + phid * i), h));
 
  for (unsigned int i = 0; i < h_num - 1; ++i) {
    for (unsigned int j = 0; j < tot; ++j) {
      points.push_back(Vec3s(r * cos(phi + phid * j), r * sin(phi + phid * j),
                             h - (i + 1) * hd));
    }
  }
 
  for (unsigned int i = 0; i < tot; ++i)
    points.push_back(
        Vec3s(r * cos(phi + phid * i), r * sin(phi + phid * i), -h));
 
  points.push_back(Vec3s(0, 0, h));
  points.push_back(Vec3s(0, 0, -h));
 
  for (unsigned int i = 0; i < tot; ++i) {
    Triangle tmp((h_num + 1) * tot, i, ((i == tot - 1) ? 0 : (i + 1)));
    tri_indices.push_back(tmp);
  }
 
  for (unsigned int i = 0; i < tot; ++i) {
    Triangle tmp((h_num + 1) * tot + 1,
                 h_num * tot + ((i == tot - 1) ? 0 : (i + 1)), h_num * tot + i);
    tri_indices.push_back(tmp);
  }
 
  for (unsigned int i = 0; i < h_num; ++i) {
    for (unsigned int j = 0; j < tot; ++j) {
      unsigned int a, b, c, d;
      a = j;
      b = (j == tot - 1) ? 0 : (j + 1);
      c = j + tot;
      d = (j == tot - 1) ? tot : (j + 1 + tot);
 
      unsigned int start = i * tot;
      tri_indices.push_back(Triangle(start + b, start + a, start + c));
      tri_indices.push_back(Triangle(start + b, start + c, start + d));
    }
  }
 
  for (unsigned int i = 0; i < points.size(); ++i) {
    points[i] = pose.transform(points[i]);
  }
 
  model.beginModel();
  model.addSubModel(points, tri_indices);
  model.endModel();
  model.computeLocalAABB();
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Cylinder& shape,
                      const Transform3s& pose,
                      unsigned int tot_for_unit_cylinder) {
  CoalScalar r = shape.radius;
  CoalScalar h = 2 * shape.halfLength;
 
  const CoalScalar pi = boost::math::constants::pi<CoalScalar>();
  unsigned int tot = (unsigned int)(tot_for_unit_cylinder * r);
  CoalScalar phid = pi * 2 / tot;
 
  CoalScalar circle_edge = phid * r;
  unsigned int h_num = (unsigned int)ceil(h / circle_edge);
 
  generateBVHModel(model, shape, pose, tot, h_num);
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Cone& shape,
                      const Transform3s& pose, unsigned int tot,
                      unsigned int h_num) {
  std::vector<Vec3s> points;
  std::vector<Triangle> tri_indices;
 
  CoalScalar r = shape.radius;
  CoalScalar h = shape.halfLength;
 
  CoalScalar phi, phid;
  const CoalScalar pi = boost::math::constants::pi<CoalScalar>();
  phid = pi * 2 / tot;
  phi = 0;
 
  CoalScalar hd = 2 * h / h_num;
 
  for (unsigned int i = 0; i < h_num - 1; ++i) {
    CoalScalar h_i = h - (i + 1) * hd;
    CoalScalar rh = r * (0.5 - h_i / h / 2);
    for (unsigned int j = 0; j < tot; ++j) {
      points.push_back(
          Vec3s(rh * cos(phi + phid * j), rh * sin(phi + phid * j), h_i));
    }
  }
 
  for (unsigned int i = 0; i < tot; ++i)
    points.push_back(
        Vec3s(r * cos(phi + phid * i), r * sin(phi + phid * i), -h));
 
  points.push_back(Vec3s(0, 0, h));
  points.push_back(Vec3s(0, 0, -h));
 
  for (unsigned int i = 0; i < tot; ++i) {
    Triangle tmp(h_num * tot, i, (i == tot - 1) ? 0 : (i + 1));
    tri_indices.push_back(tmp);
  }
 
  for (unsigned int i = 0; i < tot; ++i) {
    Triangle tmp(h_num * tot + 1,
                 (h_num - 1) * tot + ((i == tot - 1) ? 0 : (i + 1)),
                 (h_num - 1) * tot + i);
    tri_indices.push_back(tmp);
  }
 
  for (unsigned int i = 0; i < h_num - 1; ++i) {
    for (unsigned int j = 0; j < tot; ++j) {
      unsigned int a, b, c, d;
      a = j;
      b = (j == tot - 1) ? 0 : (j + 1);
      c = j + tot;
      d = (j == tot - 1) ? tot : (j + 1 + tot);
 
      unsigned int start = i * tot;
      tri_indices.push_back(Triangle(start + b, start + a, start + c));
      tri_indices.push_back(Triangle(start + b, start + c, start + d));
    }
  }
 
  for (unsigned int i = 0; i < points.size(); ++i) {
    points[i] = pose.transform(points[i]);
  }
 
  model.beginModel();
  model.addSubModel(points, tri_indices);
  model.endModel();
  model.computeLocalAABB();
}
 
template <typename BV>
void generateBVHModel(BVHModel<BV>& model, const Cone& shape,
                      const Transform3s& pose, unsigned int tot_for_unit_cone) {
  CoalScalar r = shape.radius;
  CoalScalar h = 2 * shape.halfLength;
 
  const CoalScalar pi = boost::math::constants::pi<CoalScalar>();
  unsigned int tot = (unsigned int)(tot_for_unit_cone * r);
  CoalScalar phid = pi * 2 / tot;
 
  CoalScalar circle_edge = phid * r;
  unsigned int h_num = (unsigned int)ceil(h / circle_edge);
 
  generateBVHModel(model, shape, pose, tot, h_num);
}
 
}  // namespace coal
 
#endif