[Closed] setTM for Orthographic Views?

Hi, is there a way to save the true TM of an orthographic view? (LEFT, FRONT, TOP etc…)

Whenever I run the viewport.getTM(), I get values like these:

(matrix3 [1,0,0] [0,0,-1] [0,1,0] [-115.022,-16.7307,0])
  (matrix3 [1,0,0] [0,0,-1] [0,1,0] [1.17456,-2.20587,0])
  (matrix3 [1,0,0] [0,0,-1] [0,1,0] [158.041,128.517,0])

where it doesn’t seem to get any scale/zoom values.

I’m able to make use of the row4 position though, it’s just the zoom factor that’s missing.

The closest thing that I have right now is by using the viewport.ZoomToBounds function. But in order to use this properly, I need to supply the correct pointA and pointB arguments that it needs…

I tested the function using this:

viewport.ZoomToBounds false [-1, -1, -1] [1, 1, 1]

which works well, then I tried to get the screen scale factor:

getScreenScaleFactor [0,0,0]

it returned this number:

2.34651

Does anyone have any clue how the number was derived? I just wanted to have a clearer undertanding where this number came from.

I will be using the number to generate the required point3 data by the ZoomToBounds function. Here is the working function that I’m using:

fn getOrthoZoomBounds =
  (
  	if not viewport.IsPerspView() do
  	(
  		theMagicNumber = 2.34651
  		
  		viewFactor = ( getScreenScaleFactor [0,0,0] ) / theMagicNumber
  		theScale = [viewFactor, viewFactor, viewFactor]
  		
  		viewOffset = -(inverse (getViewTM())).row4
  		pointA = -theScale - viewOffset
  		pointB = theScale - viewOffset
  		
  		#(pointA, pointB)
  	)
  )

Thanks in advance for any insights.