Unigine::Mesh class is not saving/loading custom normals.

[sebastian.vesenmayer]

Hi,

When loading my created mesh objects which I saved before there are no normals anymore in the mesh object.

Here is a reproducer:

{
		auto mesh = Unigine::Mesh::create();
		mesh->addSurface("0");
		mesh->addVertex(Unigine::Math::vec3(1.f, 1.f, 0.f), 0);
		mesh->addVertex(Unigine::Math::vec3(1.f, 0.f, 1.f), 0);
		mesh->addVertex(Unigine::Math::vec3(0.f, 1.f, 1.f), 0);

		mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);
		mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);
		mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);

		mesh->addIndex(0, 0);
		mesh->addIndex(1, 0);
		mesh->addIndex(2, 0);

		auto numVertex = mesh->getNumVertex(0);
		auto numNormals=mesh->getNumNormals(0);
		std::cout << numVertex << numNormals << std::endl;

		mesh->save("hello.mesh");
	}
	{
		auto mesh = Unigine::Mesh::create("hello.mesh");
		auto numVertex = mesh->getNumVertex(0);
		auto numNormals = mesh->getNumNormals(0);
		std::cout << numVertex << numNormals << std::endl;
	}

It affects versions 2.7.2.1 to 2.8.0.1.

Thanks,

Sebastian

[andrey-kozlov]

Hello Sebastian,

Normals of mesh are not serializable. The whole tangent basis is serialized instead. Custom normals can be used to calculate it like this:

mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);
mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);
mesh->addNormal(Unigine::Math::vec3(0.f, 0.f, 1.f), 0);

mesh->addIndex(0, 0);
mesh->addIndex(1, 0);
mesh->addIndex(2, 0);

mesh->createTangents();

And after loading normals can be read back:

auto numTangents = mesh->getNumTangents(0);
auto normal = mesh->getTangent(0, 0).getNormal();

 

[sebastian.vesenmayer]

Ok, can you please update your documentation for the save and load method to mark which properties are serialized and which not? ;)

Thanks

Edited June 11, 2019 by sebastian.vesenmayer

[morbid]

Sure, I'll forward this to our documentation team.

Thank you!