Is there a need to code a new 3D engine? [closed]

Question

Coding a new 3D engine is fascinating but I there are so many out there. Is it sane for a programmer to start a new one? Are there industry sections in need?

Answer 1

Reasons to do it:

1. You want to learn about how to make a 3D engine, and don't really care if anyone but yourself uses it.
2. None of the existing engines do what you want and it's too much trouble to modify their source code (if you can even get it).
3. You have such an awesome idea and no other engine has done it so you need to do it because whatever you're doing doesn't exist yet.

Reasons not to do it:

1. You don't have enough of these resources: time/budget/expertise.
2. An existing engine fits your needs perfectly.