Blender to Unreal - rotation matrix to left handed

Question

[I have been trying many solutions posted here and there, yet I cannot make this work]

I have a python script on blender side exporting object rotations like this

m = obj.matrix_world.to_euler('XYZ')
rot = mathutils.Vector((math.degrees(m.x),math.degrees(m.y),math.degrees(m.z)))

on unreal side, still in python, setting up rotators for imported objects :

def createRotator(actor_rotation):
    rotatorX = unreal.MathLibrary.rotator_from_axis_and_angle(unreal.Vector(0.1,0.0,0.0),actor_rotation.x)
    rotatorY = unreal.MathLibrary.rotator_from_axis_and_angle(unreal.Vector(0.0,0.1,0.0),actor_rotation.y)
    rotatorZ = unreal.MathLibrary.rotator_from_axis_and_angle(unreal.Vector(0.0,0.0,0.1),actor_rotation.z)

    temp = unreal.MathLibrary.compose_rotators(rotatorX,rotatorY)
    rotator = unreal.MathLibrary.compose_rotators(temp,rotatorZ)
    
    return rotator

yet the objects are not placed correctly (in term of rotation) in unreal

I tried:

adding - in front of different rotation members in blender
flipping the order of the unreal rotators are combined in unreal
tried y=z and z=-y
tried z = -z or y=-y
(I could go on since I been busting my head on this for a whole week)

I been through so many posts, every answer is different, and none of them is working

can someone more clever than I am end my misery and tell me how to solve this ?

thanks

[edit:]

I spawn the actor like this

pos = unreal.Vector(float(row["posx"]),float(row["posy"]),float(row["posz"]))
rot = unreal.Vector(float(row["rotx"]),float(row["roty"]),float(row["rotz"]))

rotator = createRotator(rot)
        
staticMeshActor = unreal.EditorLevelLibrary.spawn_actor_from_object(staticMesh, pos, rotator)

Blender to Unreal - rotation matrix to left handed

0 Answers