Problem with black mask + paint and normal map

[Haruo.249]

Hi everyone, I have a problem with exporting normal map from substance.
I have some fill layer with a black mask on which I have applied a paint layer. But there's an issue when exporting a normal map: pratically the black mask's paint layer "delete" the parts of normal map where ther are paint brushes. The result is that when I render in Maya's Arnold there are some black patch where the normal map is deleted.
There are some images of my problem with that. How can I resolve this?

[GeoffroySC]

Hi,

Could you try to create a base fill layer on which there is a neutral map? From what I understand you are exporting a normal map with alpha since there isn't any base information where your black mask deletes the information provided by your materials.

Feel free to ask more questions,

Thank you,

Kind Regards,

Geoffroy SC