@classmethod
    def valid_child_of(cls, parent, obj=None):
        return True
Return homogeneous rotation matrix.
dataset/ETHPy150Open fusionbox/django-widgy/widgy/models/base.py/Content.valid_child_of--crossover with--dataset/ETHPy150Open omangin/multimodal/multimodal/lib/transformations.py/Arcball.matrix