skyjedi2005 said:

I think the animated short Tie Fighter everyone went nuts about was created in CGI. Not done traditionally. He only shaded it to make it look like it was cel based.

I highly doubt he physically drew it on cels and shot it on film.

No.

Wether he drew it with a digital-stylus, or an ink-pen, cell by cell... it makes little difference, it's still Cell-Based trad-animation.

CGI means "Computer Generated Imagery". Images rendered by a computer based on human instructions. The final 2D images in a CGI show like Rebels are a computer rendered representation of 3D models. The tie fanfilm was drawn in 2D originally, just like animation was been done a century ago.

It's just dfferent tools. Just because a computer was involved doesn't make something "CGI".

Although he did use a 3D refrence to underpin some shots as he describes in this video...

https://www.youtube.com/watch?v=X0taAlZ_MxA

...still every pixel you see in those shots are drawn by his hand.