I can`t find rotate order in parameters of bones. Does anyone know if it can be changed or if Houdini bones have any rotate order? And if not, what is the way around to have FK rig (arm, leg etc.) with different rotate order. :?:
They use a fixed rotation order of ZYX and fixed transform order of SRT. The main reason for this is legacy reasons in the IK solver. Some workarounds include using Null object parents, or just try manually opparm'ing a different rotation order and see what breaks.