Function device_init

tutorials/closest_point/closest_point_device.cpp:583–670

/* called by the C++ code for initialization */
extern "C" void device_init (char* cfg)
{
  /* create scene data */
  g_triangle_meshes[0] = createPlane(
    AffineSpace3fa::translate(Vec3fa(0.f, -3.f, 0.f)) *
    AffineSpace3fa::scale(Vec3fa(10.f, 4.f, 4.f)) * 
    AffineSpace3fa::rotate(Vec3fa(1.f, 0.f, 0.f), float(pi)/2) *
    AffineSpace3fa::translate(Vec3fa(-0.5f, -0.5f, 0.f)),
    1);
  g_triangle_meshes[1] = createPlane(
    AffineSpace3fa::translate(Vec3fa(0.f, -1.f, 2.f)) *
    AffineSpace3fa::scale(Vec3fa(10.f, 4.f, 4.f)) * 
    AffineSpace3fa::translate(Vec3fa(-0.5f, -0.5f, 0.f)),
    8);
  g_triangle_meshes[2] = createTriangulatedSphere(Vec3fa(3.f, -2.f, 0.0f), 1.f);
  g_triangle_meshes[3] = createCube(Vec3fa(-3.f, -2.f, 0), 1.0f);

  /* create embree scene */
  g_sceneEmbreeInstance = rtcNewScene(g_device);
  g_sceneUserDefinedInstance = rtcNewScene(g_device);

  /* create scene that will be instanced */
  g_scene1 = rtcNewScene(g_device);

  // add the four objects to all three scenes
  {
    RTCScene scenes[] = { g_scene1, g_sceneEmbreeInstance, g_sceneUserDefinedInstance };
    for (int m = 0; m < 4; ++m)
    for (RTCScene scene : scenes)
    {
      RTCGeometry geom = rtcNewGeometry (g_device, RTC_GEOMETRY_TYPE_TRIANGLE);
      rtcSetGeometryPointQueryFunction(geom, closestPointFunc);
      rtcCommitGeometry(geom);
      rtcSetSharedGeometryBuffer(geom,RTC_BUFFER_TYPE_VERTEX,0,RTC_FORMAT_FLOAT3,g_triangle_meshes[m]->vertices, 0,sizeof(Vertex),  g_triangle_meshes[m]->num_vertices);
      rtcSetSharedGeometryBuffer(geom,RTC_BUFFER_TYPE_INDEX, 0,RTC_FORMAT_UINT3, g_triangle_meshes[m]->triangles,0,sizeof(Triangle),g_triangle_meshes[m]->num_triangles);
      rtcAttachGeometryByID(scene, geom, m);
      rtcReleaseGeometry(geom);
      rtcCommitGeometry(geom);
      rtcCommitScene(scene);
    }
  }

  /* compute bounding box of the scene that will be instanced */
  Vec3f bbmin(inf);
  Vec3f bbmax(neg_inf);
  for (int i = 0; i < 4; ++i) {
    TriangleMesh* mesh = g_triangle_meshes[i];
    for (unsigned int v = 0; v < mesh->num_vertices; ++v) {
      Vertex* vert = mesh->vertices+v;
      bbmin = min(bbmin, Vec3f(vert->x, vert->y, vert->z));
      bbmax = max(bbmax, Vec3f(vert->x, vert->y, vert->z));
    }
  }
  
  /* instantiate geometry */
  for (unsigned int i = 0; i < 3; ++i) {
    g_instanceEmbree[i] = rtcNewGeometry (g_device, RTC_GEOMETRY_TYPE_INSTANCE);
    rtcSetGeometryInstancedScene(g_instanceEmbree[i], g_scene1);