So I have this “percentage loaded” animation in Houdini and it spins counter-clockwise. I export it as alembic. When I bring it into UE4 it spins clockwise.

You really should be posting in the UE forum https://www.sidefx.com/forum/51/ [sidefx.com]

Yes, I just noticed that category. Will do in the future. Perhaps an admin can move it over.

try the lastest daily build. I was having issues with landscapes being transformed into the wrong position and its was resolved in 16.0.557.

FIXED: If you look at the image closely, it looks inside out. I tried again today and noticed that the y-axis on initial import looks to be -1. I didn't notice this when I set the scaling to 100 units (to convert 1m units from houdini into 1cm units in UE4). Setting it to -100 now shows the correct animation.