message: Fixed bug in scalar forward projection, introduced earlier on this branch
diff: @@ -147,7 +147,7 @@ public:
  inline void operator()( const ThreadIdType itkNotUsed(threadId),
  const TInput &input,
  - TOutput &current,
  + TOutput &output,
  const TOutput &rayCastValue,
  const VectorType &stepInMM,
  const VectorType &itkNotUsed(source),
  @@ -155,7 +155,7 @@ public:
  const VectorType &itkNotUsed(nearestPoint),
  const VectorType &itkNotUsed(farthestPoint)) const
  {
  - current += input + rayCastValue * stepInMM.GetNorm();
  + output = input + rayCastValue * stepInMM.GetNorm();
  }
  };
  