Fusion 360 texture map is unusable

[niamh_dwyer1]

I use Fusion 360 to create prototypes of my products, and the latest of which is a modelled house. I am attempting to export it to a rendering software, because I don't like Fusion's rendering system, but the texture map is terrible and unusable and I have no idea how to fix it. The primary issue is it splits flat faces into randomly aligned triangles, which makes it incredibly difficult to use, and I am not experienced with rendering. I know what the point of the triangles is, but it seems to just loop my textures and none of them share alignment and all distort textures on them. If it helps, my final goal is to make a clean UV map. 

Here's my model in Design mode:

Here's that same model exported as .obj and as a mesh:

I did not add curves or inclines, and the model appears perfectly flat in Design mode. Any quick fixes would be appreciated, I'd hate to spend hours remaking the model from scratch.

[TrippyLighting]

All external render engines I am aware of work only with triangles, if the model is imported.

I sometimes render models exported from Fusion 360 in Blender & Indigo Renderer.

I use .fbx as the export option as it maintains the assembly structure of the model and automatically adds a sharp marker to sharp surface boundaries ( the turquoise colored edges) . That'll make it easier to define face groups for UV mapping.

If you have no experience with rendering, this might be biting off a chunk that's to big for you right now!