I rigged a model in blender and double-checked that the roll of each bone is 0.
But after I export the model from blender to another software (SparkAR, but it doesn't matter) - the model looks right but the bone rotation is not 0. The Armature and the first bone has X-rotation -90,00001
How can I fix it, how can I apply bones rotation to make sure it is 0 after export?