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I use this simple python script to export bones transformation:

bones = armature.pose.bones
# for eaach bone in bones
SystemMatrix = Matrix.Scale(-1, 4, Vector((0, 0, 1))) * Matrix.Rotation(radians(-90), 4, 'X')
if (bone.parent):
  Export_babylon.write_matrix4(file_handler, "matrix", bone.parent.matrix.inverted() * bone.matrix)
else:
  Export_babylon.write_matrix4(file_handler, "matrix", SystemMatrix * bone.matrix)

I'm using a left handed Y up system but I should forget something about rotation because the result is not correct :(

enter image description here

Original (under Blender): enter image description here

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It's bit unclear what you are asking? –  Katu Sep 7 '13 at 17:02
    
I would like to know how to get the value of a bone transform from blender to apply it to my meshes Inside my engine –  David Catuhe Sep 8 '13 at 6:42
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1 Answer

up vote 0 down vote accepted

OK I found the solution :)

It was related to the inversion of the parent bone. For those who have the same question, here is the final exportation code:

def export_bone_matrix(armature, bone, label, file_handler):
  SystemMatrix = Matrix.Scale(-1, 4, Vector((0, 0, 1))) * Matrix.Rotation(radians(-90), 4, 'X')

    if (bone.parent):
        Export_babylon.write_matrix4(file_handler, label, (SystemMatrix * armature.matrix_world * bone.parent.matrix).inverted() * (SystemMatrix * armature.matrix_world * bone.matrix))
    else:
        Export_babylon.write_matrix4(file_handler, label, SystemMatrix * armature.matrix_world * bone.matrix)
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