I don't do animations very much, especially turnaround stuff, so I gave it a shot. I drag-and-dropped a 3D model into Clip Studio Paint and eyeballed that. I'll almost certainly work on this more but right now I want to stop
I don't think that there is any thing wrong with using a reference for animation as I said , or art in general ( I do that very often myself).
though as you described in some examples of animation styles , I do not think it is good when people trace over models in order to animate , I suppose in films its legitimate though it makes them less "artistic" through that process , but in a piece of art I do not think that tracing a model is a great thing to do , even if it is just for the general shape.
I might have just misunderstood you from the description though , if so it is my mistake.
Since the production of Snow White, animators have used film footage, photos of people and figurines, and physical figurines themselves as reference to try and memorise the subtleties they would overlook from merely copying from memory - how characters should emote with their face and bosy, or how they should obey perspective with their construction. (Although there were still cheats or stylistic changes made to disregard this, like Mickey Mouse's ears, or character's limbs having more exaggerated foreshortening because it 'read' better than just sticking to how they were captured on film footage.) Some animators, like the Fleischer studio for their Superman serials, went a step further and drew their characters on top of frames of film to produce the style and methodical timing of motion they were looking for.
It's artistically detrimental to rely on drawing over footage/models as a shortcut, but artists have generally been given the wrong lesson by society that 'any reference = cheating' [society has maintained parroting a lot of self-sacrificing slogans to exploit artists in general] and thus they've been scared away from using tools to augment their study. The staff at Disney, Flesicher etc were underpaid draftsmen who needed to put out a lot of footage each week; because of how animation history is written by the likes of Disney, people are given a rose-tinted view of animators being geniuses who could draw from imagination.
In my case it's a little different from all that. Mostly because Blender didn't exist in the early 20th century, but also because the 3D models provided by CSP are just mannequins; poseable and with a rudimentary sense of lighting, but you still need a TMNT model sheet or Google Images page to add the kind of hair, wristwatch, bodysuit with belt and pockets, boots etc that you're looking for. Like the hands on the 3D model, you have to do a lot of interpretation with the model sheet, since details don't translate across from high-res to pixel canvas (and the model sheet has three views, which means some interpoltation as well).
If this all seems like I'm bearing down on you and trying to lecture you, I'm sorry for that! I just wanted to clarify where I'm coming from.
from what I understood I thought he traced over different views of a 3D frame , if so I feel that there is not really a process of "creating" the animation , because even with the 3D model there is no need to animate it but just rotate.
though if I misunderstood and all he did was using it as a reference , then I see nothing wrong with that.
Not really. As far as I'm aware, this technique has been used many times in the animation industry and it's completely valid (look at Tarzan for instance, or Wolfwalkers. They have both utilized 3D in their 2D animation). Just so long as you're tracing over what you made - never trace over an existing animation by someone else as that's plagiarism, lol.
EDIT: Just read the description again and the person says they eyeballed it. So no, it's definitely not cheating because the 3D model was used as a reference and there's nothing wrong with using a reference. Even so, tracing over 3D (as long as it was made by you) to create 2D animation is completely valid, since you still technically made it and are just taking the extra step to "convert" it.
I am not much of an animator myself , but is it not cheating to use a 3D model for the frames ?
One of my favorite characters. Looks great already.