Surf sample file - no source in scene yet works?

[SUPERGENIUS]

Hello, from my basic understanding of Phoenix (and the tutorial movies) each sim needs two objects, the voxel grid and a source. In the Surf file, I don't see any particle systems or a PHXsource oil drum icon. How is it generating water here?

Thanks for any tips,
AJ @ Supergenius Studio

[Ivaylo Katev]

it is filled by script, see the "use script" option

[SUPERGENIUS]

Ah of course, thank you.