getyawpitchrolldegrees is failing silently

Development Programming & Scripting Verse
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1

I’ve been having trouble with rotation not doing what I expect, so I made a simple test device to experiment with it and understand the properties of this implementation better.
I’m stuck at the first hurdle though, because GetYawPitchRollDegrees is silently failing and I don’t know how to find out why.
Here’s my code & set-up:

  • I dragged a Log03 from the Content Browser to the game area, ensured it has zeroed rotation
  • I created a Verse script rotation_test, compiled it, then dragged the device to the game area too, set to run on start, hidden
  • I linked the Script to the Prop as an @editable creative_prop
rotation_test := class(creative_device):
    @editable Prop : creative_prop = creative_prop {}

    var StartPos : vector3 = vector3{}
    var DefaultRot : rotation = rotation {}
    var DefaultYPR : [] float = array {}


    OnBegin<override>()<suspends>:void=
        Print("Start rotation_test")
        T := Prop.GetTransform()
        set StartPos = T.Translation
        Print("start position {StartPos.X},{StartPos.Y},{StartPos.Z}")
        set DefaultRot = T.Rotation
        Print("start rotation {ToString(DefaultRot)}")
        spawn{ Update() }
        

    Update()<suspends>:void=
        loop:
            Sleep(3.0)
            T := Prop.GetTransform()
            if (DefaultYPR = DefaultRot.GetYawPitchRollDegrees()):
                Print("got default rotation YPR")
            else:
                Print("could not get default rotation YPR")
            if (Yaw := DefaultYPR[0], Pitch := DefaultYPR[1], Roll := DefaultYPR[2]):
                Print("Default rot {Yaw},{Pitch},{Roll}")
            else:
                Print("could not get default YPR")

The output log contains:

[2023.05.01-21.46.18:805][184]LogVerse: : Start rotation_test
[2023.05.01-21.46.18:805][184]LogVerse: : start position -3112.000000,4604.000000,11514.759663
[2023.05.01-21.46.18:806][184]LogVerse: : start rotation Axis: {x=1.000000,y=0.000000,z=0.000000} Angle: 0.000000
[2023.05.01-21.46.21:822][546]LogVerse: : could not get default rotation YPR
[2023.05.01-21.46.21:822][546]LogVerse: : could not get default YPR
[2023.05.01-21.46.24:822][906]LogVerse: : could not get default rotation YPR
[2023.05.01-21.46.24:822][906]LogVerse: : could not get default YPR

How can I track down the problem?

2

I’m an idiot (with a poor memory)…

if (DefaultYPR = DefaultRot.GetYawPitchRollDegrees()):

Is not failable, so the = is acting as a comparison instead of an assignment.

set DefaultYPR = T.Rotation.GetYawPitchRollDegrees()

I’ll forgive myself this one though, the use of single = for both is ludicrously prone to this type of error.