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Hi! Little stuck here
I found that objects created with jGfx instance system need their position/rotation correction.
I have object with limb inside, and limb is offseted a little bit, so if you call "limb position x(1)" it will be not zero. After that when I positioned object in scene it is not the same as object which was created by DBPro ( not using Jgfx ).
So I guess that JGfx doesn't use position/rotation/scale of particular limb and i need to offset each limb in Jgfx instance - according to saved limb data manually.
Ok it works fine with position only, but with added rotation not.
So I think that maybe I need to recalculate something like WorldMatrix based onbject pos/angle plus limb pos/angle , then get from it new position/scale values and then reposition my Jgfx Instance?
Also there is "GeoInst_SetWorldMatrixPtr" command - maybe using it will give more correct results?
Or there is an easier way?

I'm doing same thing at the moment, but reading in DBO files and manipulating the transform matrix (y position) per frame plus the animation position (quat or matrix) on the y axis which works perfectly for my needs.
I'm doing this by getting a pointer to the object and finding the transform data and updating it and then saving back out as a new model object.
I'll have a look at the JGFx as I have looked at that but not messed with it much.

just a quick glance at the jgfx commands again, it looks like you need:
Poke Mat4=jGfx\Poke_Mat4.html=pMem, _11#, _12#, _13#, _14#, _21#, _22#, _23#, _24#, _31#, _32#, _33#, _34#, _41#, _42#, _43#, _44#

I will try this out on my current project see if it works. it should do. my current code uses :



So logical value 13 is actually physical value 14=pos y (OR row=3 and col=1 in my array), refer to directx SDK (transform matrix). So I'm basically grabbing _42# value and changing it.

Same will apply to rotations.

Thanks!
I choose to update instance positon/rotation/scale per instance. ( because i so weak in matrixes )
Project attached. It is also useful if you need to create planet and moon for example ( or any objects which are parented to each over )
For angle reorienting you can also use EZRotate plugin ( which is free ) It provides a little bit different values though.

I try to use double floats to provide more accurate values in DBPro functions but results are still little-little different. Anyway for me everything works totally fine in both ways.
By the way there is newer version of Jgfx instance plugin called GeoInst here on the last pages: https://forum.thegamecreators.com/thread/220206?page=2
I got that there are no issues there.