[IO] Update MeshVTKLoader so that it can read polydata description of meshes

[remibessard]

Being new in this process I will proobably mixup things...

Here is a small update of the MeshVTKLoader so that it can load polydata vtk files.
This was required for my work in PREMYOM to load OpenSim files.

I hope the compilation goes smoothly. If not, the next step will obviously be to correct these potential errors.

[with-all-tests]

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Reviewers will merge this pull-request only if

• it builds with SUCCESS for all platforms on the CI.
• it does not generate new warnings.
• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[hugtalbot]

Hi @remibessard
Just so that you know a new loader (more generic/versatile) has recently been implemented by @alxbilger : https://github.com/SofaDefrost/SOFA.VTK

[remibessard]

Ha, thx for sharing this information.
of course I did not know, and this was not there last summer when I needed it.
Moreover, I am happy not to add this dependency to VTK.

But I will be happy to use this code when it will replace the VTKLoader in SOFA, that's for sure !

[bakpaul]

Suggested change

	//// Process line
	//std::cout << "Line: ";
	//for (int v : values) std::cout << v << " ";
	//std::cout << "\n";

[bakpaul]

Suggested change

	//VTKDataIO<Vec<3, std::int32_t> >* d = new VTKDataIO<Vec<3, std::int32_t> >;
	//d->read(polys2.str(), 0);
	//BaseVTKDataIO* d = BaseVTKReader::newVTKDataIO(string(typeStrTemp));

[bakpaul]

Suggested change

	//BaseVTKDataIO* d = BaseVTKReader::newVTKDataIO(string(typeStrTemp));
	//d->read(polys4.str(), 0);
	//d->read(polys5.str(), 0);
	//d->read(polys6.str(), 0);

[bakpaul]

Suggested change

	//if (currentNodeName.compare("PolyData") == 0)
	//{
	// dataArrayNode = node->FirstChildElement("DataArray");
	// for (; dataArrayNode;
	// dataArrayNode = dataArrayNode->NextSiblingElement("DataArray"))
	// {
	// dataArrayElement = dataArrayNode->ToElement();
	// checkError(dataArrayElement);
	// const string currentDataArrayName = string(dataArrayElement->Attribute("Name"));
	// BaseVTKDataIO* celldata = loadDataArray(dataArrayElement, numberOfCells);
	// checkError(celldata);
	// celldata->name = currentDataArrayName;
	// inputCellDataVector.push_back(celldata);
	// }
	//}

[hugtalbot]

What was discussed previously @remibessard is that this can be integrated into SOFA anyway. The other plugin will later be integrated and possibly replace this code. Would you mind taking the reviews into account?