https://www.cnet.com/news/how-red-bull-rampage-put-an-ar-mountain-in-your-living-room/

But the Rampage experience lets you interact with the virtual course in different ways. You can zoom in to see the riders as they come down the mountain or view 360-degree streams around the course.

The 3D model of the mountain was made from over 1,000 photos with a technique called photogrammetry. Because the mountain isn't exactly an easy subject to capture on foot, a drone with a 100-megapixel camera was flown to capture high-resolution photos from the air.