Normal estimation

[MatMik96]

I have a problem when re-computing my surface normals of a mesh in open3d. The problem is that the estimation is not good enough and I don't know how to make it better. From the image below it cannot be seen that the mesh has a valley in the middle of the belly.

However, if the same mesh is seen from the side it clearly has a valley.

If I then use MeshLab to do the normal estimation the hole can suddenly clearly be seen. MeshLab support 4 different functions for the normal estimation of a mesh but the result are more or less the same no matter which function I use.
Here is the same mesh after estimating normals with MeshLab.

I find it very strange that open3d does no even come close to the accuracy of MeshLabs normal estimation, and I believe that it is most likely because I miss some important calculation before using open3d normal estimation function.
Here is the code which is use for the normal estimation in open3d:

`void ReconstructionSystem::constructMeshDeformation(glm::vec3& intersectionPosition, glm::vec3& robotPosition) {

	double depthOfProbe = glm::distance(intersectionPosition.z, robotPosition.z);
	
	double affectedArea = 0.015 * (depthOfProbe*100.0); // 0.015 is a random value the function simply works good with it
	if (affectedArea > 0.08) {
		affectedArea = 0.08;
	}
	deformatedMesh = std::make_shared<open3d::geometry::TriangleMesh>(*final_mesh);
	int i = 0;
	for each (Eigen::Vector3d vertex in deformatedMesh->vertices_) {
		glm::vec3 vex = glm::vec3(vertex.x(), vertex.y(), vertex.z());
		double dist = glm::distance(vex, intersectionPosition);
		if (dist < affectedArea) {
			double ratio = dist / affectedArea;
			double deformationAmount = glm::cos((2.0 * M_PI * ratio) / 4.0);
			deformatedMesh->vertices_.at(i).z() -= depthOfProbe * deformationAmount;
		}
		i++;
	}
	*deformatedMesh = deformatedMesh->ComputeVertexNormals();
}

`

I hope that someone might be able to help with my problem :-)