mask for multiple surfaces object

[Pierre]

Hi
I am currently using iToo Forest 9.3.2 with 3ds Max 2026.2.
I would like to distribute grass across two separate mesh objects (rocks), with each object utilizing a different mask for distribution. I am wondering if it is possible to achieve this using a single Forest Pack object, or if it requires creating two separate Forest Pack ?

Thank you for your help.

Best regards,
Pierre

[Michal Karmazín]

Hi Pierre,

Although there’s only one Surface Area, you can disable it and add two Spline Areas to cover those surfaces instead. This way, you can adjust the Distribution Map settings individually for each of them.

I hope this helps.

Best regards,

[Pierre]

Thank you for your reply Michal
Unforntunatly my meshes are overlapping in places. With the method you described, is it possible to limit the distribution of a mask to a specific mesh, perhaps by using an ID?

[Michal Karmazín]

Yes, for these purposes, you can use the Surf. Mat. ID field, which allows you to include only the listed Material ID(s).

Best regards,