save xform data

[ofZach]

Is there an easy way to add xform data to to the ofxAlembicWriter? Looked into adding this but I am afraid I didn't totally understand how the writer is setup so it was hard to add myself.

[ofZach]

if it's helpful to anyone, here's some code to save an xform ripped from a test case -- there's obviously alot more complicated stuff you can do:

std::string name = "someOpsXform.abc";
OArchive archive( Alembic::AbcCoreHDF5::WriteArchive(), name );
TimeSampling Ts(1.0 / 24.0, 0);
Alembic::Util::uint32_t tsidx = archive.addTimeSampling(Ts);
OXform a( OObject( archive, kTop ), "a");
a.getSchema().setTimeSampling(tsidx);
XformSample samp;
for (size_t i = 1; i < 180 ; ++i){
    XformOp transop( kTranslateOperation, kTranslateHint );
    XformOp rotatop( kRotateOperation, kRotateHint );
    XformOp scaleop( kScaleOperation, kScaleHint );
    samp.addOp( transop, V3d(i * 5, 0.0, 0.0) );
    samp.addOp( rotatop, V3d(0.0, 0.0, 1.0), 0.0 );
    samp.addOp( rotatop, V3d(0.0, 1.0, 0.0), 0.0 );
    samp.addOp( rotatop, V3d(1.0, 0.0, 0.0), i );
    samp.addOp( scaleop, V3d(1.0, 1.0, 1.0) );
    a.getSchema().set(samp);
}

I think being able to throw ofxMatrix4x4s at ofxAlembic would be great, but this solves my immediate need of saving nulls with translation and orientation.

[satoruhiga]

Hi zach,

I just added xform export. https://github.com/perfume-dev/ofxAlembic/commit/7acdc57e0e957e4f5a8606f2624fec5a68c14bbd

but it do not well tested. if you find some bugs, please let me know