C++ (Cpp) TVector3::magnitudeSquaredの例

コード例 #1

ファイル: bspheretree.cpp プロジェクト: SinaC/OldRaytrace

// If a given ray intersect the object's bounding sphere then add it
// to the priority queue.
void PriorityQueueSphere::checkAndEnqueue( const BSphereTree *Node, const BSphere &sphere, const TRay &ray ) {
  TVector3 rayToCenter = sphere.m_Center - ray.origin;
  float B = ( ray.direction | rayToCenter );
  float C = rayToCenter.magnitudeSquared() - sphere.m_Radius2;
  float discriminant = B*B-C;
  
  if ( discriminant < 0.0f )
    return;
  
  float sqrtDiscr = sqrtf(discriminant);
  // store smallest positive solution
  float dmin = B-sqrtDiscr;
  if ( dmin <= 0.0f )
    dmin = B+sqrtDiscr;
  if ( dmin <= 0.0f )
    return;

  insertElem( dmin, Node );
}