Faces | Wobbl

Selectors

top   x=min   z>5   normal +z   hole d=4.5   holes d<6   filletsface 12   within 15 of 50,-25,35   top and within 12 of 65,12.5,6

Run wobbl inspect first and it shows which of these exist on your part. When a selector matches nothing, the error lists the hole sizes and the largest flat faces that are there.

Every selector

Selector	Picks
`top` `bottom` `left` `right` `front` `back`	the flat outer faces at that extreme, with z up and the front facing minus y
`x=min` `z=max` `y=12.5`	faces lying in that plane
`x>100` `z<5` `y>=0`	faces whose center is past that coordinate
`normal +z`, `normal 0,0.7,0.7`, `facing down`	flat faces whose outward normal points that way
`holes`, `hole d=4.5`, `holes d<6`, `hole near 55,0,10`	holes, by diameter or by the one closest to a point
`bosses`, `fillets`, `cylinders r=3`, `flats`, `curved`	faces by shape, with `d` or `r` and `=`, `<`, `>`, `<=` or `>=`
`largest`, `largest flat`, `smallest`, `area>100`	faces by size in mm2
`near 10,20,5`	the single face closest to a point
`within 15 of 50,-25,35`	only the part of faces within 15 mm of the point, a round patch
`box 0,0,0,10,20,5`	only the part of faces inside the box, given as two corners
`face 12`, `faces 3,5,7`	face ids from `wobbl inspect`
`all`	every face

A size like hole d=4.5 matches within 5% or 0.1 mm, whichever is larger, so a hole modeled at 4.52 mm still counts.

Combining them

and keeps faces that match both sides and or keeps faces that match either. The patch clauses, within and box, are applied first, so top and within 14 of 210,0,25 means the highest flat face near that point, cut down to a 28 mm circle. That is the usual way to put a load on a small pad of a larger face.

Flags

--load "40 N down @ top and within 12 of 65,12.5,6"--fix "bolt holes d=3.2 and x<0"--heat-faces "bottom and box 17.5,17.5,-1,42.5,42.5,0.5"

Ids versus names

Face ids come from the CAD file and change whenever the part changes, so a selector by name or position keeps working after an edit while an id may not. When wobbl fix --apply changes the geometry, Wobbl carries each selector over to the new faces by itself.