I study three dimensional, do you have any development in the security door?

Security doors, or all products need model drawings before production, you can render realistic renderings according to your ability.

Security doors are only one aspect, and other aspects can be. You can participate in a number of industrial design competitions to promote the improvement of your abilities. When looking for a job, use good results in competitions to prove that you are better than anything else.

The anti-theft door is used less, and the CAD used in general is a little more, and it is recommended to go to some abrasive design companies, decoration companies, and animation.

The scope is a bit narrow, and the field of renderings is very wide, like some aircraft, ships and other simulators require a lot of graphics image processing.

It's still up to you to your own preferences and characteristics.