[Closed] viewportTM, and the matrix

Hi,

OK, so at the risk of showing how much I don’t understand about the matrix I’m going to post my problem.

This script aligns the current selection to the minimum object in the x axis, but it doesn’t work when the viewport TM is in two out of four quadrants, for example:

In the current iso orthographic view, if the current viewportTM is looking towards the x, y or -x, -y then it doesn’t align properly. In the other two cases, -x,y and x, -y hey presto.

Can you help?

(
	sel=selection as array							-- get the selections as an array.
	tm=(inverse (viewport.getTM()))			-- get the current screen coordinate matrix.
	selpos=#()											-- set an array to hold the positions of the objects in the selection set.
	in coordsys tm selpos=for s in sel collect s.pos.x			-- collect all of the object positions in the screen coordinate system.

	t=tm.row1
	m=0
	m=t[1]+t[2]+t[3]								-- let's work out if it the normal or reverse view by adding each axis of the TM row1 (answer will be positive or negative),
	
	if m<0 then 										-- collect the min or max value depending on the view (normal or reverse)
	(
		in coordsys tm seladj=for s in sel collect s.max.x
	) else 
	(
		in coordsys tm seladj=for s in sel collect s.min.x
	)
	
	v=amin seladj																			-- get the lowest position in the selection set
	newpos=for x=1 to sel.count collect (v+selpos[x]-seladj[x])			-- set the target values to the lowest position, and adjust for object width
	
	for j=1 to sel.count do																-- set the new positions
	(
		in coordsys tm sel[j].pos.x=newpos[j]
	)
)

Josh.