setting a second sample on the OPolyMeshSchema creates a invalid mesh in Maya

[luiz elias]

Hello,

I'm trying to export a mesh with animation. For that I've copied a test example from git hub:

https://github.com/alembic/alembic/blob/master/lib/Alembic/AbcGeom/Tests/PolyMeshTest.cpp

inside void optPropTest() it shows how to apply multiple samples on the OPolyMeshSchema but it creates a invalid mesh in maya with zero verts. If I comment line 333 than it works but I lose the animation:

        for ( size_t i = 0; i < 2; ++i )
        {
            mesh.set( mesh_samp );
            for ( size_t j = 0; j < g_numVerts; ++j )
            {
                verts[j] *= 2; // <--- commenting this line creates a valid mesh in maya 
            }
        }

That's the only example I could find on how to export a animated mesh. 

Any idea of why it happens and how to fix it?

Thank You

[Lucas Miller]

Did you look at the file with another tool like abcls to confirm the point data is as you expect?

It could be an issue where maybe your point data went out of scope or was cleared (verts)  between sample sets, or maybe the data is structured in a way that Maya doesnt like when animated. (does your polymesh have a transform above it?)

Lucas

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[luiz elias]

You are right, the problem was the missing transform.

What is wierd is that if there is a missing transform, maya creates one for you, as long the mesh has a single sample.

Thanks for the help!!!