- Wrap `computeNormalsPC3d()` for python

- Update its usage

modules/surface_matching/include/opencv2/surface_matching/ppf_helpers.hpp

@@ -148,13 +148,13 @@ CV_EXPORTS Mat addNoisePC(Mat pc, double scale);
  *  If PCNormals is provided to be an Nx6 matrix, then no new allocation
  *  is made, instead the existing memory is overwritten.
  *  @param [in] PC Input point cloud to compute the normals for.
- *  @param [in] PCNormals Output point cloud
+ *  @param [out] PCNormals Output point cloud
  *  @param [in] NumNeighbors Number of neighbors to take into account in a local region
  *  @param [in] FlipViewpoint Should normals be flipped to a viewing direction?
  *  @param [in] viewpoint
  *  @return Returns 0 on success
  */
-CV_EXPORTS int computeNormalsPC3d(const Mat& PC, Mat& PCNormals, const int NumNeighbors, const bool FlipViewpoint, const double viewpoint[3]);
+CV_EXPORTS_W int computeNormalsPC3d(const Mat& PC, CV_OUT Mat& PCNormals, const int NumNeighbors, const bool FlipViewpoint, const Vec3d& viewpoint);
 
 //! @}
 

modules/surface_matching/samples/ppf_normal_computation.cpp

@@ -65,7 +65,7 @@ int main(int argc, char** argv)
   cv::ppf_match_3d::loadPLYSimple(modelFileName.c_str(), 1).copyTo(points);
 
   cout << "Computing normals\n";
-  double viewpoint[3] = { 0.0, 0.0, 0.0 };
+  cv::Vec3d viewpoint(0, 0, 0);
   cv::ppf_match_3d::computeNormalsPC3d(points, pointsAndNormals, 6, false, viewpoint);
 
   std::cout << "Writing points\n";

modules/surface_matching/src/ppf_helpers.cpp

@@ -720,7 +720,7 @@ void meanCovLocalPCInd(const float* pc, const int* Indices, const int ws, const
 
 }
 
-CV_EXPORTS int computeNormalsPC3d(const Mat& PC, Mat& PCNormals, const int NumNeighbors, const bool FlipViewpoint, const double viewpoint[3])
+CV_EXPORTS int computeNormalsPC3d(const Mat& PC, Mat& PCNormals, const int NumNeighbors, const bool FlipViewpoint, const Vec3d& viewpoint)
 {
   int i;