Method getNodeTransform

Engine/source/environment/river.cpp:2059–2109

}

MatrixF River::getNodeTransform( U32 idx ) const
{   
   MatrixF mat(true);   

   if ( mNodes.size() - 1 < idx )
      return mat;

   bool hasNext = idx + 1 < mNodes.size();
   bool hasPrev = (S32)idx - 1 >= 0;

   const RiverNode &node = mNodes[idx];   

   VectorF fvec( 0, 1, 0 );

   if ( hasNext )
   {
      fvec = mNodes[idx+1].point - node.point;      
      fvec.normalizeSafe();
   }
   else if ( hasPrev )
   {
      fvec = node.point - mNodes[idx-1].point;
      fvec.normalizeSafe();
   }
   else
      fvec = mPerp( node.normal );
   
   if ( fvec.isZero() )
      fvec = mPerp( node.normal );

   F32 dot = mDot( fvec, node.normal );
   if ( dot < -0.9f || dot > 0.9f )
      fvec = mPerp( node.normal );

   VectorF rvec = mCross( fvec, node.normal );
   if ( rvec.isZero() )
      rvec = mPerp( fvec );
   rvec.normalize();

   fvec = mCross( node.normal, rvec );
   fvec.normalize();

   mat.setColumn( 0, rvec );
   mat.setColumn( 1, fvec );
   mat.setColumn( 2, node.normal );
   mat.setColumn( 3, node.point );

   AssertFatal( m_matF_determinant( mat ) != 0.0f, "no inverse!");

   return mat; 
}

void River::deleteNode( U32 idx )
{