Hi,
Please, try adjusting the
Direction settings under the
Surface tab (by default set to 100) - I would recommend you set it to Surface's
Normal (0). Especially for these purposes, you can take advantage of the
Scale to fit sloped area option. You can find more about these settings in our
online reference guide.
In case of any further troubles with it, as it's really hard to say, what's happening exactly in your scene just from the provided description, if possible, please feel free to
send us your scene (ideally simplified and containing just this problematic object(s)).
Thanks in advance for any further details you can share about it with us / our user community (in case some user(s) will run into similar troubles).
Best regards,