Method getISPCCamera

tutorials/common/tutorial/camera.h:73–82

    Vec3fa camera2world(const Vec3fa& p) { return xfmPoint(camera2world(),p); }

    ISPCCamera getISPCCamera (size_t width, size_t height)
    {
      const float fovScale = 1.0f/tanf(deg2rad(0.5f*fov));
      const AffineSpace3fa local2world = camera2world();
      Vec3fa vx = local2world.l.vx;
      Vec3fa vy = -local2world.l.vy;
      Vec3fa vz = -0.5f*width*local2world.l.vx + 0.5f*height*local2world.l.vy + 0.5f*height*fovScale*local2world.l.vz;
      Vec3fa p =  local2world.p;
      return ISPCCamera(AffineSpace3f(vx,vy,vz,p));
    }

    void move (float dx, float dy, float dz)
    {