Getting object positions relative to another object's local space?

Submitted by jaijinsunrise on Mon, 2010-05-31 00:11

UPDATE =================================

Thanks to Insanto and Anubis I have found two ways to do what I needed below!

1. theCoords = ($Box01.transform * (inverse $Plane01.transform)).pos
2. theCoords = in coordsys $Plane01 $Box01.pos

========================================

Hello, I'm having trouble getting object's positions relative to another object's rotation & position (transform). See example below:

 

I'm trying to get the coordinates of this box relative to this plane's local coordinates. The XYZ coords it should return in this case would be (0,-20,-25).

I have tried
in coordsys $Plane01 $Box01
 but it returns the value of the Box's coordinates in world space.. something like (0, 3.536, 46.481)

I've managed to move the box in Plane01's world space using in coordsys $Plane01 move $Box01 [0,0,1] which is a tease but this is not what I need. Did I miss something here? I've looked all over in the documentation. I've included the example scene. Thanks for any help!

‹ Using a float controller to move a plane i make script about sweep... please help ›

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Graph's picture
Submitted by Graph on Tue, 2010-06-01 04:04.

(b.transform * (inverse

(b.transform * (inverse p.transform)).pos

Raphael Steves

jaijinsunrise's picture
Submitted by jaijinsunrise on Tue, 2010-06-01 11:33.

Brilliant!! I think this

Brilliant!! I think this method provides great insight as to how the position is calculated. Thank you so much!

- Dru

Anubis's picture
Submitted by Anubis on Mon, 2010-05-31 13:16.

I dont see scene attached but

I dont see scene attached but with the next code I hope you will see what you miss ;)

--// scene setup...
p = plane width:60 length:60
b = box width:10 height:10 length:10
b.pos = [10,20,0]
b.parent = p
p.rotation.x_rotation += 22
 
--// test #1
b.pos -->> [10,18.5437,7.49213]
in coordsys p b.pos -->> [10,20,0]
--// Works OK
 
--// test #2
b.parent = undefined
b.pos -->> [10,18.5437,7.49213]
in coordsys p b.pos -->> [10,20,0]
--// Works OK

my recent MAXScripts RSS (archive here)

jaijinsunrise's picture
Submitted by jaijinsunrise on Tue, 2010-06-01 11:30.

Awesome, Thank YOU!!! Looks

Awesome, Thank YOU!!! Looks like I missed ".pos" when doing my tests(doh!). I knew this forum and members like you would help me see the light!. Thank you!

- Dru

jaijinsunrise's picture
Submitted by jaijinsunrise on Mon, 2010-05-31 01:45.

I've created this hack, but I

I've created this hack, but I think it's a bit sloppy. There has to be a better way..

fn translatePosition theObject theTargetObject =
(
local helperDummy = dummy()
helperDummy.transform = theObject.transform
local lc = link_constraint()
helperDummy.controller = lc
lc.addTarget theTargetObject 1
local thePos = helperDummy.pos
delete helperDummy
return thePos
)

myPos = translatePosition $Box01 $Plane01

- Dru

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