How to distinguish between different kinds of array property in Alembic.

[jiang fan]

Hello,

I'm importing .abc data to my programme with this example: 

https://github.com/alembic/alembic/blob/master/bin/AbcEcho/AbcEcho.cpp

For now I can distinguish the data by using iProp.getName() as line 87. 

For example, when I want to get the point array in my alembic data, I can do :

 if(iProp.getName() == "P") {   //by the way, this is the exact data that I use.
      float* tempFloat = (float*)(samp->getData());
      nbPoints = totalValues;
      for (index_t x = 0; x < totalValues; x++) {
        std::cout<<tempFloat[m] <<std::endl;
      }
    }

I want to know if in Alembic, the name of points array is always "P" (I've tried 2 .abc files and I can correctly read the points array with the name "p"). Am I using the right way to read array property data? If not, what is the right way to distinguish them. thanks. 

[Lucas Miller]

It's pretty safe to assume  P is point data, however you can find out more about a particular IArrayProperty by getting its DataType info.  (iProp.getDataType() from the AbcEcho example)

https://github.com/alembic/alembic/blob/master/lib/Alembic/AbcCoreAbstract/DataType.h

For many general applications you would normally use the I*Schema to read a particular IObjects data, in your case you might use IPolymeshSchema to read all the relevant polymesh information.

See:

https://github.com/alembic/alembic/blob/master/lib/Alembic/AbcGeom/IPolyMesh.h

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

If you are making something more specialized, like say something that were to ONLY look at point data, then your approach is a good one.

Lucas

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[jiang fan]

Thanks, I think I'll need to use I*Schema.