Stick to Just One Design Field or Mix Them Up?

Such is today´s world that specializing in one field may not be enough. Often is the case where people have to branch out and learn things outside their field as they are partially connected. 

You may not see a connection between a Web Designer, Graphic Designer & 3D Modeller. One can argue they are completely different and independent fields altogether and each should stick to their own. Why should a 3D Modeller learn Graphic Design and why should a Graphic Designer learn Web Design? 

Surprisingly these fields are a lot more related than one might think. Allow me to elaborate by using examples:

1. A 3D modeller may spent many hours creating a scene in 3D. Say this scene is a new building development and it needs to be rendered for advertising purposes where people can visualize the building before it has even been built. It may have been created in 3D, however it also needs to have textures added to it to make it look realistic. For example bricks for the external walls, titles for the swimming pool, tarmac for the roads, titles for the roof, grass for the swimming pool area. All these textures are created using Graphic Design and then incorporated into the 3D scene.
   
   (3D and Graphic Design Mix)
   
   
2. A Web Developer has spent countless hours programming his new e-commerce website where he/she is selling various products. There will come a point where the design of the website will need to be worked on and that will also involve Graphic Design or even 3D Design.
   
   (Web, Graphic and 3D Design Mix)

Therefore, the question is, is it best to stick solely to your own field or also expand onto other fields to achieve the desired results?

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