When you go to movies, many of the effects and objects are created using 3D software. Most products are created from digital 3D models.
As we can see, digital 3D technology is very prevalent in our current modern world and society. Therefore this area of work is increasingly ubiquitous in the world.
Below is a list of careers and job types related to the area of 3D:
1. Product and industrial design
2. Automotive and vehicle design
3. Architectural and interior visualisation.
4. Mechanical engineering
5. 3D animator and riggers
6. 3D modellers
7. Concept artist
Learn 3D modeling and animation is expensive in terms of time spent, as well cost. This is because high end 3D software costs thousand of dollars. Unless, you opt for open source solution. The most powerful open source solution for 3D graphic is Blender 3D. Although freely downloadable and available, Blender is really professional grade application. It can be used to created 3D digital models, photorealistic renderings and life-like animations. It is closest equivalent are probably great commercial 3D applications such as 3DS Max and Maya. Makehuman is a free program for creation digital human characters. The combination of Blender and Makehuman makes for efficient tooling for creation of digital human.
However, if one wants to work in the relevant industry it is usually better to learn the industrial standards softwares.
For example, if you are a mechanical engineer, a good knowledge of 3D CAD software such as Solidworks, SolidEdge, Pro Engineer is very useful. If you are into movies and film animation, Maya is a common software tool. For industrial and product design, knowledge of Rhinoceros and Alias is useful.