Houville :: Alembic transform theft

Now that I'm typing this I'll probably not forget it. If I don't post this, I'll definitely forget it.

//Alembic packed info put onto existing geo.
matrix abc = primintrinsic(1,'packedfulltransform',0);
P *= abc;

This is kind of messed up, but handy if you want to freeze geo, affect it, but then have it resume animation from an incoming abc transform animation. Input 1 is the frozen and tweaked geo, 2 is the animated abc and 3 is the abc frozen on the same frame as 1.

//Alembic packed info from static frame subtracted out, then a the animated one put back in/
matrix abc = primintrinsic(1,'packedfulltransform',0);
matrix abcRef = primintrinsic(2,'packedfulltransform',0);

P *= invert(abcRef) * abc;