i am doing as exercie an airplane, i did a tube and extruded a windows of it. now i want to clone it to make the airplane body. how can i make sure that the space that i clone is the same as the geometry so i can use a Fuse node after,

i might need an expresion?

1 more thing why when i move components inside houdini, example extrude a poly i just see the result after i realease the handle (or click on the mouse) i just see the transform tool moving but not the polygons, is this something default in Houdini, or something i can change?

thanks .

try variables $SIZEX, $SIZEY, $SIZEZ

if you are duplicating along x axis then type $SIZEX in translatex parameter of the Copy SOP and so on

at the bottom right corner of the screen you can see menu button which can say
Auto Update, On Mouse Up, Manual

you probably have it set to On Mouse Up right now
so set it to Auto Update