I understand that the actor class can only be accessed using Python, and to do animation blending you need actor.enableBlend();
But is there any way to do animation blending in C++?
Yes, of course. Actor is only a wrapper around the C++ classes which do all of the real work.
Specifically, Actor.enableBlend() calls down to PartBundle::set_anim_blend_flag().
David
Thank you so much, now my animation is much smoother 