I'm trying to create a Hololens application using UrhoSharp and am confused by the following line of code:
var ray = LeftCamera.GetScreenRay(0.5f, 0.5f);
The resource I'm using claims the two floats are "normalized screen coordinates" but I don't understand what this means in 3D. I believe it's creating a ray whose origin is at the origin of "LeftCamera", but pointing in what XYZ direction? Any help clearing this up is greatly appreciated. Thanks in advance!