PHAST-Risk contour

[kalamj]

This is my first post in this forum, and I would like to thank all the contributors for their effort to enrich this community.

I am new user with Phast risk, and have experienced some problems with risk contour; in fact some of the contour lines showed irregular shapes "star shape".
I would be very grateful if anyone could help to resolve this problem to make smoothed contour lines.

[Bever]

start shapes come from having the wind direction distribution incorrect which is to be set in the menu.

[Bever]

star shapes come from having the wind direction distribution incorrect which is to be set in the menu.

[kalamj]

thanks for the answer, but wind direction settings didn't help. have also tried the max cell size/number in the risk contour option, it seems to affect the shapes but did not resolve the problem. it must be some parameters in relation with precision (grid/ cell/ step) and interpolation.