How is grid_radius calculated

[povolann]

Hello, can you please explain a bit more in detail how did you set up the rendering parameters for the ffhq dataset?
dataset_fov = 12.6 # from face estimator
grid_radius = [1.2, 1.2, 1.2] # estimate grid size via sin(fov/2)*r * sqrt(2) -> 1.6
I assume that r is radius, so it would be sin(0.21989/2)10 sqrt(2)=1.55~1.6
But when I tried to double check it with the carla dataset, but the calculation doesn't really seem correct: sin(0.21989/2)10 sqrt(2)=3.66? So, can you explain a bit more what exactly is the grid_radius? Thank you!!