The wonderful thing about buildings and structures made in a digital environment is that they can be made to look and work however you want, without having to consider any limitations of physical reality. In real life, buildings can only reach a certain height or weight before they may collapse or wouldn’t be able to function properly. In a digital 3D setting, a modeller doesn't need to have the same mindset as an actual architect or builder. Not only can a modeller create any type of building, with no restrictions, the building also doesn’t need to make logical sense for it to work. When you’re building a house, it needs to have a certain structure for it to even stand, a brick wall needs to have a specific pattern for the bricks to be placed. But in 3D, those rules don’t apply, and people have been able to come up with some truly unique designs.
Another great thing about digital 3D buildings is that they can be a good pre-vis for an actual building in real life. Real estate developers can hire digital 3D modellers to create models from an idea that they have and can see it fully made in a digital environment much quicker than even creating a physical model. That way, real estate developers can get a better idea beforehand if something works as intended or not. There may have even been cases where an architect might play a modelling game to help stimulate an idea or develop an early version of a building they are going to design. Games like "The Sims" are a good example of where people can play to stimulate creative ideas, as you get to build a lot of houses in that game from scratch.
Could we use fantasy and other 3D ideas that kids have today for buildings in real life at some point in their lifetimes in the future? Many architectures in fantasy and other genres probably wouldn’t really work in our world today, however, that doesn’t mean that they are not influential on conceptual design going forward, borrowing some of the interesting ideas to create new innovative house designs for the future.
What have people made and have there been any patterns? What a lot of people like to do when they’re creating a building in 3D is play with the reality of weight. They might have a very tall and big house that’s being held up by an impossibly thin pillar from underneath that would snap in half and collapse if it was in the real world. Futuristic animations usually don’t have much going on in terms of what’s on the building itself, they tend to be clean and generally take the form of simple shapes, while fantasy animations like to play around with a bunch of unique shapes and have a lot of things covering the building, from plants hanging from windows to roofs being very random shapes. Ideas like these do seem to have filtered through into design reality.
While it is subjective to say that some modern houses and cities today can look uninteresting, games and animated shows usually make sure that their world is visually stunning to look at. In the future, one could hope that architects and construction methods take more inspiration from fiction and perhaps apply this to the real world.