Method createHairyPlane

tutorials/common/scenegraph/geometry_creation.cpp:409–444

  }

  Ref<SceneGraph::Node> SceneGraph::createHairyPlane (int hash, const Vec3fa& pos, const Vec3fa& dx, const Vec3fa& dy, const float len, const float r, size_t numHairs, CurveSubtype subtype, Ref<MaterialNode> material)
  {
    RandomSampler sampler;
    RandomSampler_init(sampler,hash);

    RTCGeometryType type = (subtype == ROUND_CURVE) ? RTC_GEOMETRY_TYPE_ROUND_BEZIER_CURVE : RTC_GEOMETRY_TYPE_FLAT_BEZIER_CURVE;
    Ref<SceneGraph::HairSetNode> mesh = new SceneGraph::HairSetNode(type,material,BBox1f(0,1),1);

    if (numHairs == 1) {
      const Vec3fa p0 = pos;
      const Vec3fa p1 = p0 + len*Vec3fa(1,0,0);
      const Vec3fa p2 = p0 + len*Vec3fa(0,1,1);
      const Vec3fa p3 = p0 + len*Vec3fa(0,1,0);
      mesh->hairs.push_back(HairSetNode::Hair(0,0));
      mesh->positions[0].push_back(Vec3ff(p0,r));
      mesh->positions[0].push_back(Vec3ff(p1,r));
      mesh->positions[0].push_back(Vec3ff(p2,r));
      mesh->positions[0].push_back(Vec3ff(p3,r));
      return mesh.dynamicCast<SceneGraph::Node>();
    }

    Vec3fa dz = cross(dx,dy);
    for (size_t i=0; i<numHairs; i++) 
    {
      const Vec3fa p0 = pos + RandomSampler_getFloat(sampler)*dx + RandomSampler_getFloat(sampler)*dy;
      const Vec3fa p1 = p0 + len*normalize(dx);
      const Vec3fa p2 = p0 + len*(normalize(dz)+normalize(dy));
      const Vec3fa p3 = p0 + len*normalize(dz);
      mesh->hairs.push_back(HairSetNode::Hair(unsigned(4*i),unsigned(i)));
      mesh->positions[0].push_back(Vec3ff(p0,r));
      mesh->positions[0].push_back(Vec3ff(p1,r));
      mesh->positions[0].push_back(Vec3ff(p2,r));
      mesh->positions[0].push_back(Vec3ff(p3,r));
    }
    return mesh.dynamicCast<SceneGraph::Node>();
  }

  Ref<SceneGraph::Node> SceneGraph::createGarbageTriangleMesh (int hash, size_t numTriangles, bool mblur, Ref<MaterialNode> material)
  {