Most of the wave parameters can be set in the API using code such as that in the Python example below (C# version is analogous):
# set waves to irregular
prj.Environment.Sea.TimeVaryingWaves.ModelType = 2
# set spectral model type to JONSWAP
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.WaveType = 0
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Height = Hs
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Period = Tp
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Peakedness = Gamma # doesn't work!
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.RandomSeed = RandomSeed
prj.Environment.Sea.TimeVaryingWaves.Direction = Mdir
print (prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Height)
print (prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Period)
# print (prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Peakedness) this throws an error
However, the Peakedness parameter is not handled correctly and will throw an error if you try to read it. You can set it without an error in Python, but the value won't be recognised by Bladed.
This is a known bug which will be fixed in due course. The answer is to use a different part of the API data model (the "Legacy" model).
Replace this line:
prj.Environment.Sea.TimeVaryingWaves.IrregularWaves.Peakedness = Gamma
with this one:
prj.LegacyModel.OldWAVES.fGamma = Gamma