spin direction sign fix

adrianVmariano · adrianVmariano · commit 289d6afb3e6f · 2024-09-02T08:14:30.000-04:00
diff --git a/attachments.scad b/attachments.scad
@@ -3755,7 +3755,7 @@ function _find_anchor(anchor, geom) =
                                              direction= unit(mean([for(face=edgefaces) polygon_normal(select(vnf[0],vnf[1][face]))])),
                                              edgedir = edge[1]-edge[0],
                                              nz = [for(i=[0:2]) if (!approx(edgedir[i],0)) i],
-                                             flip = last(nz) < 0 ? -1 : 1, 
+                                             flip = edgedir[last(nz)] < 0 ? -1 : 1,
                                              spin = _compute_spin(direction, flip*edgedir)
                                         )
                                         [direction,spin]

Original file line number	Diff line number	Diff line change
`@@ -3755,7 +3755,7 @@ function _find_anchor(anchor, geom) =`
`3755`	`3755`	`direction= unit(mean([for(face=edgefaces) polygon_normal(select(vnf[0],vnf[1][face]))])),`
`3756`	`3756`	`edgedir = edge[1]-edge[0],`
`3757`	`3757`	`nz = [for(i=[0:2]) if (!approx(edgedir[i],0)) i],`
`3758`		`- flip = last(nz) < 0 ? -1 : 1,`
	`3758`	`+ flip = edgedir[last(nz)] < 0 ? -1 : 1,`
`3759`	`3759`	`spin = _compute_spin(direction, flip*edgedir)`
`3760`	`3760`	`)`
`3761`	`3761`	`[direction,spin]`