topic Re: INode rotation using Python and MaxPlus in 3ds Max Programming Forum

INode rotation using Python and MaxPlus

Anonymous — Tue, 09 Oct 2018 12:21:53 GMT

When using INode.SetLocalRotation or INode.SetWorldRotation or assigning rotation directly to INode.Rotation, the rotation gets added to the current rotation which seems somewhat contradictory to the names of the methods.

Is adding rotation supposed to be the intended behavior?

If it is then what is the simplest way of setting the absolute rotation using Python?

And why after just a few times of using any of the aforementioned methods the scale of rotated node starts to increase?

Re: INode rotation using Python and MaxPlus

mateusz.zelent — Sat, 05 Jan 2019 22:54:39 GMT

Hi,

have you solved this problem?

Re: INode rotation using Python and MaxPlus

Anonymous — Mon, 07 Jan 2019 13:01:07 GMT

Not really.
It seems to be a bug in 2018/19 versions (probably in earlier ones as well).
Not surprising considering the quality of Python API.
And it's 3dsMax so don't hold your breath waiting for the fix.
As a workaround, you can use INode.SetLocalTM

Re: INode rotation using Python and MaxPlus

mateusz.zelent — Mon, 07 Jan 2019 13:47:41 GMT

Hi, thanks for your response.

I have found a answer how to do it, please look:

            MaxPlus.Core.EvalMAXScript("a = $'"+n.GetName()+"'.pos")
            MaxPlus.Core.EvalMAXScript("$'"+n.GetName()+"'.pivot  = $'"+n.GetName()+"'.center")
            MaxPlus.Core.EvalMAXScript("$'"+n.GetName()+"'.rotation = (quat " + str(float(vers_i[0])) + " "+ str(float(vers_i[1])) + " "+ str(float(vers_i[2])) + " "+ str(float(vers_i[3])) + ")")
            MaxPlus.Core.EvalMAXScript("$'"+n.GetName()+"'.pos = a")

but right know it seams the objcets rotates in strange way, not that i'm expecting.

Re: INode rotation using Python and MaxPlus

mateusz.zelent — Mon, 07 Jan 2019 15:24:03 GMT

Ok, This solution works fine, but we have to remeber that 3dsmax has different order in Quat(x,y,z,w)

Re: INode rotation using Python and MaxPlus

istan — Tue, 08 Jan 2019 15:16:30 GMT

Due to the lacking documentation of MaxPlus Python documentation I did not even consider start using it. I am wondering to which SDK functions the SetLocalTM() and SetWorldTM() map to?! With SDK it's unlike clearer using SetNodeTM().