Align object on floor in Houdini

Align object on floor

align on the floor

add match size node justify X: none justify Y: Min justify Z: none

or

add transform node translate: 0 -$YMIN 0

stack multiple objects on top of each other:

add 2 objects add match size node and feed both objects justify X: none justify Y: Min to Max justify Z: none (instead of using transform with bbox) repeat for multiple objects

center pivot:

add transform node pivot translate: $CEX $CEY $CEY

center object

add transform node translate: -$CEX -$CEY -$CEY