* Added embree2.0 support

Former-commit-id: a673cab3e5838ac084449d944077c339055d4474

include/igl/cotangent.h

@@ -14,8 +14,8 @@ namespace igl
   //   F  #F by {3|4} list of {triangle|tetrahedra} indices into V
   // Outputs:
   //   C  #F by {3|6} list of cotangents corresponding angles
-  //     for triangles, columns correspond to edges 23,31,12
-  //     for tets, columns correspond to edges 23,31,12,41,42,43
+  //     for triangles, columns correspond to edges [1,2],[2,0],[0,1]
+  //     for tets, columns correspond to edges [1,2],[2,0],[0,1],[3,0],[3,1],[3,2]
   template <class MatV, class MatF, class MatC>
   IGL_INLINE void cotangent(const MatV & V, const MatF & F, MatC & C);
 }

include/igl/embree/Embree2Intersector.h

@@ -0,0 +1,324 @@
+#ifndef IGL_EMBREE_INTERSECTOR_H
+#define IGL_EMBREE_INTERSECTOR_H
+
+#include "include/embree.h"
+#include "include/intersector1.h"
+#include "common/ray.h"
+#include <vector>
+
+namespace igl
+{
+  struct Hit
+  {
+    int id; // primitive id
+    float u,v; // barycentric coordinates
+    float t; // distance = direction*t to intersection
+  };
+
+  template <
+  typename PointMatrixType,
+  typename FaceMatrixType,
+  typename RowVector3>
+  class EmbreeIntersector
+  {
+  public:
+    // V  #V by 3 list of vertex positions
+    // F  #F by 3 list of Oriented triangles
+    EmbreeIntersector();
+    EmbreeIntersector(
+      const PointMatrixType & V,
+      const FaceMatrixType & F,
+      const char* structure = "default",
+      const char* builder = "default",
+      const char* traverser = "default");
+    virtual ~EmbreeIntersector();
+  
+    // Given a ray find the first hit
+    // 
+    // Inputs:
+    //   origin     3d origin point of ray
+    //   direction  3d (not necessarily normalized) direction vector of ray
+    // Output:
+    //   hit        information about hit
+    // Returns true if and only if there was a hit
+    bool intersectRay(
+      const RowVector3& origin, 
+      const RowVector3& direction,
+      Hit& hit,
+      float tnear = 0,
+      float tfar = embree::inf) const;
+
+    // Given a ray find the all hits in order
+    // 
+    // Inputs:
+    //   origin     3d origin point of ray
+    //   direction  3d (not necessarily normalized) direction vector of ray
+    // Output:
+    //   hit        information about hit
+    //   num_rays   number of rays shot (at least one)
+    // Returns true if and only if there was a hit
+    bool intersectRay(
+      const RowVector3& origin,
+      const RowVector3& direction,
+      std::vector<Hit > &hits,
+      int& num_rays,
+      float tnear = 0,
+      float tfar = embree::inf) const;
+
+    // Given a ray find the first hit
+    // 
+    // Inputs:
+    //   a    3d first end point of segment
+    //   ab   3d vector from a to other endpoint b
+    // Output:
+    //   hit  information about hit
+    // Returns true if and only if there was a hit
+    bool intersectSegment(const RowVector3& a, const RowVector3& ab, Hit &hit) const;
+    
+  private:
+    embree::RTCGeometry* mesh;
+    embree::RTCTriangle* triangles;
+    embree::RTCVertex *vertices;
+    embree::Intersector1 *intersector;
+  };
+}
+
+// Implementation
+#include <igl/EPS.h>
+
+template <typename RowVector3>
+inline embree::Vector3f toVector3f(const RowVector3 &p) { return embree::Vector3f((float)p[0], (float)p[1], (float)p[2]); }
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+igl::EmbreeIntersector < PointMatrixType, FaceMatrixType, RowVector3>
+::EmbreeIntersector()
+{
+  static bool inited = false;
+  if(!inited)
+  {
+    embree::rtcInit();
+    embree::rtcStartThreads();
+    inited = true;
+  }
+}
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+igl::EmbreeIntersector < PointMatrixType, FaceMatrixType, RowVector3>
+::EmbreeIntersector(const PointMatrixType & V,
+                    const FaceMatrixType & F,
+                    const char* structure = "default",
+                    const char* builder = "default",
+                    const char* traverser = "default")
+{
+  static bool inited = false;
+  if(!inited)
+  {
+    embree::rtcInit();
+#ifdef VERBOSE
+    embree::rtcSetVerbose(3);
+#endif
+    embree::rtcStartThreads();
+    inited = true;
+  }
+  
+  mesh = embree::rtcNewTriangleMesh(F.rows(),V.rows(),structure);
+
+  // fill vertex buffer
+  vertices = embree::rtcMapPositionBuffer(mesh);
+  for(int i=0;i<(int)V.rows();i++)
+  {
+    vertices[i] = embree::RTCVertex((float)V(i,0),(float)V(i,1),(float)V(i,2));
+  }
+  embree::rtcUnmapPositionBuffer(mesh);
+
+  // fill triangle buffer
+  triangles = embree::rtcMapTriangleBuffer(mesh);
+  for(int i=0;i<(int)F.rows();i++)
+  {
+    triangles[i] = embree::RTCTriangle((int)F(i,0),(int)F(i,1),(int)F(i,2),i);
+  }
+  embree::rtcUnmapTriangleBuffer(mesh);
+
+  embree::rtcBuildAccel(mesh,builder);
+  embree::rtcCleanupGeometry(mesh);
+  
+  intersector = embree::rtcQueryIntersector1(mesh,traverser);
+}
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+igl::EmbreeIntersector < PointMatrixType, FaceMatrixType, RowVector3>
+::~EmbreeIntersector()
+{
+  embree::rtcDeleteIntersector1(intersector);
+  embree::rtcDeleteGeometry(mesh);
+  embree::rtcStopThreads();
+  embree::rtcExit();
+  embree::rtcFreeMemory();
+}
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+bool 
+igl::EmbreeIntersector< PointMatrixType, FaceMatrixType, RowVector3>
+::intersectRay(
+  const RowVector3& origin,
+  const RowVector3& direction,
+  Hit& hit,
+  float tnear = 0,
+  float tfar = embree::inf) const
+{
+  embree::Ray ray(toVector3f(origin), toVector3f(direction), tnear, tfar);
+  intersector->intersect(ray);
+  
+  if(ray)
+  {
+    hit.id = ray.id0;
+    hit.u = ray.u;
+    hit.v = ray.v;
+    hit.t = ray.tfar;
+    return true;
+  }
+
+  return false;
+}
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+bool 
+igl::EmbreeIntersector < PointMatrixType, FaceMatrixType, RowVector3>
+::intersectRay(
+  const RowVector3& origin, 
+  const RowVector3& direction,
+  std::vector<Hit > &hits,
+  int& num_rays,
+  float tnear = 0,
+  float tfar = embree::inf) const
+{
+  using namespace std;
+  num_rays = 0;
+  hits.clear();
+  int last_id0 = -1;
+  double self_hits = 0;
+  // This epsilon is directly correleated to the number of missed hits, smaller
+  // means more accurate and slower
+  //const double eps = DOUBLE_EPS;
+  const double eps = FLOAT_EPS;
+  double min_t = tnear;
+  bool large_hits_warned = false;
+  embree::Ray ray(toVector3f(origin),toVector3f(direction));
+
+  while(true)
+  {
+#ifdef VERBOSE
+    cout<<
+      o[0]<<" "<<o[1]<<" "<<o[2]<<" + t*"<<
+      d[0]<<" "<<d[1]<<" "<<d[2]<<" ---> "<<
+      endl;
+#endif
+    ray.tnear = min_t;
+    ray.tfar = tfar;
+    ray.id0 = -1;
+    num_rays++;
+    intersector->intersect(ray);
+    if(ray)
+    {
+      // Hit self again, progressively advance
+      if(ray.id0 == last_id0 || ray.tfar <= min_t)
+      {
+        // push min_t a bit more
+        //double t_push = pow(2.0,self_hits-4)*(hit.t<eps?eps:hit.t);
+        double t_push = pow(2.0,self_hits)*eps;
+#ifdef VERBOSE
+        cout<<"  t_push: "<<t_push<<endl;
+#endif
+        //o = o+t_push*d;
+        min_t += t_push;
+        self_hits++;
+      }
+      else
+      {
+        Hit hit;
+        hit.id = ray.id0;
+        hit.u = ray.u;
+        hit.v = ray.v;
+        hit.t = ray.tfar;
+        hits.push_back(hit);
+#ifdef VERBOSE
+        cout<<"  t: "<<hit.t<<endl;
+#endif
+        // Instead of moving origin, just change min_t. That way calculations
+        // all use exactly same origin values
+        min_t = ray.tfar;
+
+        // reset t_scale
+        self_hits = 0;
+      }
+      last_id0 = ray.id0;
+    }
+    else
+      break; // no more hits
+    
+    if(hits.size()>1000 && !large_hits_warned)
+    {
+      cerr<<"Warning: Large number of hits..."<<endl;
+      cerr<<"[ ";
+      for(vector<Hit>::iterator hit = hits.begin(); hit != hits.end();hit++)
+      {
+        cerr<<(hit->id+1)<<" ";
+      }
+      
+      cerr.precision(std::numeric_limits< double >::digits10);
+      cerr<<"[ ";
+      
+      for(vector<Hit>::iterator hit = hits.begin(); hit != hits.end(); hit++)
+      {
+        cerr<<(hit->t)<<endl;;
+      }
+
+      cerr<<"]"<<endl;
+      large_hits_warned = true;
+
+      return hits.empty();
+    }
+  }
+
+  return hits.empty();
+}
+
+template <
+typename PointMatrixType,
+typename FaceMatrixType,
+typename RowVector3>
+bool 
+igl::EmbreeIntersector < PointMatrixType, FaceMatrixType, RowVector3>
+::intersectSegment(const RowVector3& a, const RowVector3& ab, Hit &hit) const
+{
+  embree::Ray ray(toVector3f(a), toVector3f(ab), embree::zero, embree::one);
+  intersector->intersect(ray);
+
+  if(ray)
+  {
+    hit.id = ray.id0;
+    hit.u = ray.u;
+    hit.v = ray.v;
+    hit.t = ray.tfar;
+    return true;
+  }
+
+  return false;
+}
+
+#endif //EMBREE_INTERSECTOR_H