Hey @scottunreal
no, 
I just need the scene to match the real footage as close as possible. In almost any 3D software you can just simply set a resolution or sensor size combined with focal point distance or lense specs. (in UE you can do that too, just a bit limited).
@jwatte @scottunreal
What you normally do is just take the lens’s focal distance and the sensor size and boom you go everything you need. BUT the go-pro is just using digital lenses. It physically just has one sensor size and one lense. The rest ist computational. The stock lense is a fish-eye lense which needs to be un-distorted. And the sensor has a crazy true 5K resolution but to do all the computation and have the high fps it shoots at a virtual sensor size / resolution of 4K (3840*2160 px).
Now normally that would be easy. I just take the lense focal point and recalculate the dimensions of the sensor. BUT its somehow not working here right. I must overlook something. As unreal is using ONLY the sensor size to direct everything. (which is technically the correct, physical, logical way to do).
I hope to find a workaround. When I find it I will post it here as well.