@Julian Nino here's an enhanced version of the set WWR measure that might be helpful. It allows you to Add Remove Or Replace Windows By Facade.

The methods @macumber mentioned are exercised in the K12 and office AEDG fenestration measures. They will be the top two search results on the link above. The current pattern method lets you set ratio and skylight size, and then spacing is determined to meet those requirements. It results in a grid of skylights, and works on flat or sloped ceilings, and also non-rectangular surfaces. This is powered by @macumber-magic.

The comment below shows some of the code from one of the AEDG measures.

making vector

      # making vector
      spaces = OpenStudio::Model::SpaceVector.new
      spaces << space

      # making pattern
      ratio = daylightFenestrationRulesHash["#{climateZoneNumber} Skylight"]["dFRmin"]
      pattern = OpenStudio::Model::generateSkylightPattern(spaces,spaces[0].directionofRelativeNorth,ratio, skylightSize, skylightSize) # ratio, x value, y value

      # applying skylight pattern
      skylights = OpenStudio::Model::applySkylightPattern(pattern, spaces, OpenStudio::Model::OptionalConstructionBase.new)

I wonder if the built in setWindowToWallRatio method in that measure will work on non-wall surfaces since it takes a double heightOffsetFromFloor? Might have to try it.

MattewSteen, the set window to wall ratio measure on BCL has specific code to limit to walls surfaces with exterior boundary condition, but you could set it to run on a wall. That may be fine on A-frame style sloped roof, but I would expect odd behavior on a flat roof.